Track width, in this specific case where impedance control is not needed, must guarantee a smaller enough resistance to the trace. 6mils that is the same as given in the stack-up. What is the width of a trace for 100 ohm impedance? The width of a PCB trace for a specific impedance depends on factors like dielectric material and thickness. 2. Thickness. For your convenience, we have designed an Impedance Calculator to help you calculate the impedance and the trace width you require. 1. Here, =. With copper on the sides, this is called "dual co-planar waveguide" You will need to find proper calculator for this strip configuration, and make proper corrections to you trace width and separations. 50 Ohms and then specifically sets this trace width as a qualifier. Stripline Trace. my board thickness is 1,5mm (base material) and 35um Cu. You’ll have to input the following parameters and click on Calculate to view the results: PCB width; PCB length; Total number of component pins; Wiring channel width; Via pad diameter; Trace/space. Twisted-Pair Impedance Calculator; Stripline Trace Width Calculator;. The second part shows the impedance table which gives the details of impedances on different layers along with the trace widths and trace spacing. Dielectric Information . You can find trace impedance calculators online or in your CAD software. For this reason, trace width is important in the design of striplines. Where: Z0 Z 0 = characteristic impedance of the asymmetric stripline in ohms (Ω). Calculate the pcb trace impedance of. Trace top width: Trace base width – 1 mil: Nan Ya Plastics NP-155F (4 to 8 layers) Core Thickness: εr: Prepreg Type: Resin Content: Nominal Thickness: εr: 0. TransLine. 44, c = 0. We get a lot of questions about trace impedance and how to calculate the right trace size to hit a specific impedance in a manufacturable PCB. The Layer Stack Manager in Altium Designer can be used to easily arrange signal and plane layers in a PCB stackup and determine the impedance of traces in each layer. This time I am trying something new. The Impedance Formula Editor dialog. To use these to design for a target impedance, simply cycle through various geometric values for the trace width until the calculator returns the target impedance. This is good enough so we can now switch to the “Coupled Microstrip Line” calculator. I will see if I can come up with something for vias similar to my Transmission Line. 7 pages of equations to evaluate the impedance. Sierra Circuits follow this. 5mm pitch BGA. Summary. Layers contain controlled impedance that is why we need to specify these impedances in the fab notes since there can be more than one value of impedance traces per layer. K = 0. endolith. 0 and (t/h) less than 0. 2mm0. Optimization results for example 2. 1 to 2. Using the built-in Simbeor ® impedance calculator, the PCB editor's Layer Stack Manager calculates the trace width needed to deliver the specified impedance. ft. Changing the stack-up will affect the calculated trace width for impedance-controlled traces; however it will not automatically update existing traces. If you know the values of any of the two parameters (conductor width, max temperature, max current capacity) it determines. T is the trace thickness [oz/ft 2], W is the trace width [mils], R is the resistance [Ω], ρ is the resistivity parameter, whose value for copper is 1. What are the limits of the trace width calculator? The formulas used in the calculator are based off IPC-2221 (formerly IPC-D-275), which covers up to 35 Amps, trace widths up. 8. We recommend the software from. Trace Spacing Calci 3. F-A t t enua t o rs. Geometric Parameter Definitions: W: trace width: T: trace thickness: H (/H1) height of trace or dielectric above return plane: C: distance between the differential stripline pair: er. 25 mils , t = 1. The PCB Impedance Calculator in Altium Designer. ( 0. Can PCB traces be too wide? Yes, PCB traces can be too wide, which may lead to inefficient use of board space and increased manufacturing costs. Impedance; Signal Loss; S Parameter. Now also calculates DC resistance with temperature compensation. 2mm 1. This is more than the to times trace width which is recommended (also read as close as possibly). The manufacturer performs a test to. When it comes to the equations, you simply need to use the following: W = \frac {A} {1. The guides says spacing under 0. Microstrip Impedance Calculator. Aside from impedance and annular ring calculations, one of the other major formulas specified in this standard relates temperature rise, trace width, and trace current. However, minimum trace width recommendations from manufacturers should be. 8W + T)] Where: Z: Characteristic impedance of the microstrip trace. The differential impedance you get from a typical calculator you'll find online is just an approximation; more advanced tools are needed to verify the result and set a. 18. Electromagnetic fields are part of the spectrum ranging from static magnetic fields to high-intensity gamma rays. (Fat!) Formulas for calculating this can be found in various. Trace Current Calci User Inputs: [Amps] [Degrees C] [oz. Impedance quality = Q = L/Rs 2. Chemandy on the other hand tells me 14. H 2 H 2 = subtrate height 2. For a 1 inch trace, this value would have a total inductance of ~7. If the Length, l, to diameter, d, ratio is known, you can calculate the Inductance, L, series resistance, Rs and the aspect ratio l/d is related to Q = L/Rs for a given conductor material. Column by Maurizio Di Paolo Emilio, EEWeb Editor. 048 x dT. A 20 mil trace will have a much greater tolerance for losing metal than a 3 mil trace would. Impedance Controlled Routing Starts with the Right Calculator In some cases, impedance calculators can be very useful as they allow you to calculate the impedance of an isolated trace by. The subsequent dialog that appears - the Impedance Formula Editor dialog - contains impedance calculators for both Microstrip and Stripline impedance. 8 * W + T)]) ohms. Next, determine the trace. T T = trace thickness. IPC-A-600 Inspectors. The length matching of these differential pairs is important because these two lines are time-dependent or delay dependent. 3mm. A PCB impedance calculator uses field solvers to accurately approximate impedance values. Altium will assume you want to confine the signal to your trace (and ground plane), rather than cause radiation. Trace Thickness (T) 2. It’s a three-in-one calculator. Tuning the Width and Gap Settings. Ohm’s Law provides the framework for solving network analysis problems; when the curtain gets pulled back, Ohm’s Law updates to become the relationship between voltage, current, and impedance, not resistance. differential trace impedance for USB (90 Ohms) on 2-layer FR4 board. In addition to the width and thickness of the trace, the impedance is a function of the thickness of the substrate, the dielectric constant of the substrate, and the distance of the trace from the ground plane. 4 mil trace thickness. Line Types and Impedance (Zo))Impedance (L/C)-*Lower Er Materials Net Higher Impedance Traces and Faster Propagation Times per given Trace Width & Trace-to-Ground Separation. 8W + T)] Where: Z: Characteristic impedance of the microstrip trace. The impedance of a trace is decided by its width and height from a reference plane. $egingroup$ @Troy Cados: Incidentally, I have a nice workflow for ATLC: 1) section my PCB RF trace, 2) take a photo through my microscope, 3) Using photoshop lasso tool, trace out the signal, ground and dielectric regions 4) fill in with correct colors, 5) calculate with ATLC. Just as important as determining an appropriate trace width for a single-ended trace is determination of an appropriate spacing between two traces in a differential pair. However, when using EEWeb's impedance calculator, I get much different values. com PCB Trace Impedance Calculator. It is not always possible to adjust trace length and width, hence implementing lower copper thickness is one of the feasible ways. surface/external edge. For example, if you wish to input "25000000", just type "25M" instead. Looking at the design I should have done the following but do not think them alone would explain the results. In HDI boards, where BGAs of fine pitch are used, careful selection of trace widths and height are employed to escape the traces between pads and vias in pads. Factors Affecting Coplanar Waveguide Impedance When calculating coplanar waveguide impedance, there are many factors that affect the waveguide’s impedance, losses, and isolation:This calculator is designed to calculate the characteristic impedance of a symmetric stripline - a flat conductor between two ground planes whose distance between the conductor and the planes is the same for both reference planes. Typ e, V ref and, if needed, I a d j , select the field you want to calculate (one of the resistors or the output voltage) and enter the other two values. 4 mil, εr. Trace Impedance Calculator; Length Conversion; Wire Size Conversion Calculator; Inductance Conversion; See. For example the width of the trace(W) is 6 mils and the distance between the differential pair(A) is 8 mils. This tool will also provide the signal propagation delay, capacitance, and inductance per unit length. Keep in mind that the reactance of the ideal inductor has the same magnitude as its impedance. 1< W/H < 3. calculate the impedance and capacitance of PCB traces. The Calculator has the following tools: Regulators. 0mmCurrent layer:4-layer. Microstrip Impedance Calculator. $$H$$ = subtrate height $$W$$ = trace width $$T$$ = trace thickness $$epsilon_{r}$$ = substrate. Just enter the given values for trace thickness, substrate heights, trace width and subtrate dielectric in the calculator above and press the "calculate" button. h : Trace thickness, t (input3) : Impedance, Zo (input4) : OUTPUT Microstrip Width, mils : EXAMPLE: Inputs: Relative dielectric permittivity = 3. layout impedance. ALGEBRAIC EQUATIONS Single Track For the stripline of Figure 2 with a symmetrically centred track of zero thickness, Cohn[3] has shown that the exact value of the characteristic impedance is 4. The IPC-2141 trace Impedance calculator will help make initial design easier by allowing the user to input basic parameters and get a calculated impedance according to the IPC-2141 standard. 2. Dual Stripline Trace. 98H / (. 0mm 1. There are four different types of impedance used in characterizing differential trace impedances. Calculate the impedance gradient and the reflection coefficient gradient. For more accurate numbers, you can use a trace impedance calculator online. Impedance control with BGA escape routing in HDI PCBs H eff = H 1 + H 2 2 H e f f = H 1 + H 2 2. 0. Differential Impedance Ω. to select appropriate isolation materials, layer thickness, trace width, distance between traces,. 4mm PCB for a trace width of 0. The JLCPCB Impedance Calculator computes track width values and recommended stack-ups from user-input values of board layer, thickness, copper weight, target impedance, trace spacing (for edge-coupled pairs), and impedance trace to copper gap (coplanar waveguides). A stripline is similar to the microstrip except that the flat conductor is now. You can find trace impedance calculators online or in your CAD software. The impedance calculator will then use this information along with the target impedance values to make its trace width calculations. We use the stackup calculator in Hyperlynx for our impedance calculations. Polar or rectangular grids only allow direct reading of S11. Trace Impedance Calculator. 8 with 2-oz copper. Features: Three-in-one calculator. The Track Width tool calculates the trace width for printed circuit board conductors for a given current and temperature rise. Here are the steps to validate your design using Better DFM: 1. H: Height (thickness) of the dielectric substrate. Thickness. Sierra Circuits’ Trace Width, Current Capacity and Temperature Rise Calculator is an advanced PCB tool that works based on the latest IPC-2152 standard. Abrupt changes in trace width cause impedance discontinuities. Sierra Circuits can: Help you with your controlled impedance stack-up. Embedded Microstrip. Place your components, vias, coupling capacitors. 7E-6 to 2. So, the dielectric at my 5-6GHz frequency range is 3. Sierra Circuits’ Via Thermal Resistance Calculator is an advanced PCB design tool that expedites the process of designing thermal vias. At the point of bending, the trace width is 1. 2, the resulting trace width required for 50 Ohm impedance would be 15. The Smith Chart achieves this by superimposing a grid on S11 that maps load impedance. It is possible to select other units. This calculator assumes the distance between the two reference planes to be an equal distance. You can then check this PCB trace width against. Using this calculator, I found 100 Ohms by giving 9 mils of track width, 5 mils of track separation, 8 mils of dielectric. 7E-6 [Ω · cm] L is the trace length [cm] T is the trace thickness [cm] W is the trace width. A higher current requires thicker traces while a thicker. Before the length-tuning section, the odd. Cite. Things I noticed in any RF IC. Designing trace width for HDI impedance adjustments. ViaMin. 4 mm, trace spacing S = 0. ϵr ϵ r = substrate dielectric. 72mil. To calculate the proper trace width for routing, PCB layout designers must add these parameters to the circuit's impedance. This should be provided along with the PCB material. 44. W W is the PCB trace width, in thousands of an inch (mil); A. trace width:. ) such real numbers for the line impedances are sufficient. In order to get 100 Ohms differential, the line width must be. Learn More about using the Altium Designer’s impedance calculator in this brief tutorial. Layout designers will use a PCB impedance calculator to solve the electromagnetic field and deliver accurate trace variables for fabrication. One of the most common inquiries that we encounter at Bittele electronics are regarding our standard trace widths for a given board thicknesses and copper weight. This phase shift found between the current and voltage in the inductive circuit, nevertheless, prevents them from being exact. You can’t rely on these online calculators. Note: The results are only for approximation and rough estimation, the final values and the. *As Trace Width Increases, Trace Impedance Decreases (Thickness has Min Effect). Apr 7, 2008. Explanations of signal integrity issues. I've used 7 mil trace width with 5 mil spacing, top and bottom layers (35um copper) are 0. With PCBWay impedance calculator, you can calculate the approximate impedance of your PCB / high frequency circuit board. To calculate PCB trace resistance, The 50 ohm PCB trace calculator is designed considering the following formula. 3 mils in the Substrate 1 Height text box, re-enter 75Ohms in the Impedance text box and click the Upper Trace Width Calculate button W2, the upper trace width resolves to 5. Trace width for breaking out 100Ω differential microstrip from 0. Pad Stack Calculator 4. R. R. 024, b = 0. Advanced Electronics Solutions. The IPC-2141 trace Impedance calculator will help make initial design easier by allowing the user to input basic parameters and get a calculated impedance according to the IPC-2141 standard. The standard trace spacing for PCB design can vary based on the application, but common values range from 6 to 10 mils (thousandths of an inch) for general-purpose designs. The Impedance Formula Editor dialog. It's open-source to download. For a first design (e. This calculator finds both odd and even transmission line impedance. W=trace width. For a rough estimate, it might be in the range of 10 to 20 mils (0. The tool provides two networks that will have the desired impedence at that frequency. You can use our trace width calculator to design the right traces for your boards. 3, a trace width of approximately 0. Talk to a Sierra Circuits PCB Expert today. 5 oz. The formula used in this calculator is an approximation for the characteristic impedance of a coplanar waveguide: scssCopy code. Enter the values of trace width (w), trace thickness (t), trace dielectric thickness (h), overall dielectric thickness (h1), and the dielectric constant (er). With a standard 0. Calculates the characteristic impedance and per-unit-length parameters of typical printed circuit board trace geometries. When in doubt, use 1 for copper, . Microstrip Width Calculator. The designer can normally enter their desired impedance, and the calculator will determine the PCB trace width needed to meet that impedance goal. Impedance calculators or formulas like the one mentioned earlier can help determine the required trace width. In the case where there is a plane present, a correction factor is applied to determine the required copper. Dielectric constant. The Calculator. The ratio of cross-hatch conductor width (HW) to cross-hatch pitch (HP) plays an important role while characterizing the cross-hatch plane. By formulas from IPC-2221, PCB Trace Width Calculator can estimate the width of copper PCB boards and the trace required under the given current, and at the same time keep the rise in trace temperature not to exceed the limit. RF Wireless World. Since impedance traces are not specified here, the manufacturing focus is completely upon building a board within +/-10% tolerance of the specified dielectric thickness from layer to layer. Calculate the impedance of a twisted-pair cable given dimensions and find the signal propagation delay, capacitance, and inductance per unit. Most of the microstrip impedance calculators you’ll find online use a similar process: enter your microstrip geometry and Dk value for your PCB substrate materials, and the tool will return the impedance for your. For budgetting reasons I'm tied to a stock pooling layer stackup, so I went for OSHpark's 4-layer stackup (35um copper - 0. Pressure Conversion. IPC-2221 establishes standards for PCB design aspects such as schematic, material selection, thermal management, DFM, DFA, DFT, and quality assurance. Select a Configuration. But it can calculate the wave impedance of a trace that feeds an antenna structure. 30967mm) is slightly larger the size of the smallest pad (0. This calculator computes the characteristic impedance of a twisted-pair cable based on its dimensions. 062. These measurements were gathered from traces that targeted a 50 Ohm impedance. Where: H is the height of the PCB above the ground plane. The size of the signal and polarity of the signal that is reflected is measured. The differential impedance of MIPI tracks should be 100 Ohms, not 90 (USB requires 90). Use the following equation to calculate the impedance of a stripline trace layout. Next, determine the trace height/length. 035 mm, we have a PCB trace width of w = 0. If you need to use differential pairs, you. Measuring the trace width we get a width of 5mm. 208mm per stackup at here. 25mm between the differential pair with a width of 0. ) Dramatically decrease the spacing in between differential pairs: I know:As explained in Part 1 of this series ( Circuit Cellar 367, February 2021 [3]), PCB manufacturers can propose different PCB stack-ups, and specifying a low thickness for the so-called “top prepreg” will help to reduce the trace width. 1< W/H < 3. 44 x A0. When crosshatching (or meshed) return paths are deployed on flex PCBs and rigid-flex boards rather than the solid copper pour return paths of traditional rigid PCBs, the calculation of impedance of stripline and microstrip PCB traces requires Hatch Impedance Calculation. Cu thickness. Matching the differential trace length and keeping the distances between the traces consistent is a common practice. 0. 9E-3 [1/°C], T TEMP is the trace temperature [°C]Calculate the required trace width for a specified current using the PCB Trace Width calculator. R. Fabricators give trace impedance tables as guides to designers that need to implement controlled impedance in their PCBs. Calculates the characteristic impedance and per-unit-length parameters of typical printed circuit board trace geometries. 7 x 10-6 ohm-cm αcopper. 4. 6k 24 24 gold badges 118 118 silver badges 183 183 bronze badges. 725. Try This New Tool. The best way to calculate trace impedance is by using a trace impedance calculator. Below is the schematic Below is my layout. I am designing a 4 layers PCB and under the antenna trace I have a keepout, so there is no cooper on the 2 internal layers ( L2 and L3). We recommend the software from Polar Instruments if you want to get exact impedance calculation. Relative Dielectric Constant ( εr ): Track Width. W W = trace width. 0. You can also calculate the accurate drill diameter, via to via spacing, and the thermal vias that. MICROSTRIP WIDTH CALCULATOR. 08mm, my trace width should be 0. The IPC-2221 standard and IPC-2152 standard both include this guidance on designing for thermal reliability, and there has been some debate as to the applicability of each standard. For differential pairs, a coupled microstrip line can work also. 25 Ohms and is therefore out of the limit. 25 mils, Impedance = 50 Ohm. Adjust the length matching to achieve propagation delay. At 2 amps I'd worry more about voltage drops. Where W is the trace width, L is the trace length, and H is the trace thickness. A standard trace width for an ordinary signal (no special requirements) may be in the 7-12 mil range and be as long as a few inches, but there are many things that should be considered when defining the width and length of a trace. where Z 0,surf can be computed as specified in Eq. H: Height (thickness) of the dielectric substrate. 0. Pasternack PCB Microstrip Calculator is an online calculation tool that lets you compute a microstrip's height/width ratio, impedance and relative dielectric constant for a microstrip transmission line. 6. There is some relationship with trace width and board cost in mass production. 25mm, a trace width of 0. The edge couple differential symmetric stripline transmission line is a common technique for routing differential traces. Other conductor properties include: ; Conductor skin depth ; Conductor voltage drop ; Conductor. The JLCPCB Impedance Calculator computes track width values and recommended stack-ups from user-input values of board thickness, copper weight, layer,. W: trace width: T: trace thickness: H (/H1)The trace width calculator uses empirical formulas based on long traces with no special heat sinking. Calculate the Differential Microstrip Impedance of a transmission line based on the the distance between the strips, height of the substrate, trace thickness and dielectric constant of the substrate. Note: ρcopper = 1. 13mm (depends on manufacturer's specs) and you get a trace width of ~0. $$Z_{0}$$ = characteristic impedance of the microstrip in ohms (Ω). Controlling trace width within a tolerance of +/- 10% is necessary for better impedance control. 1. I don't use less than 4 thou track widths due to the fact that a minor etching issue can introduce errors that are a large percentage of the track width. Email us: through our Customer Care form. You will see the trace width is 5. The designer can normally enter their desired impedance, and the calculator will determine the PCB trace width needed to meet that impedance goal. Equation 3. . With this data, you can easily calculate the trace impedance of any PCB using an impedance calculator. However, when using EEWeb's impedance calculator, I get much different values. W: Width of the microstrip trace. Click on Setup -> Constraints > Electrical Constraints Set - > Differential Pair Value - > Calculator > If you put 10 in the Line Width, the calculator calculates the single ended as well as differential impedance. 5. 6. Via is considered as a cylinder of copper and its circumference is 2 𝝅r or 𝝅d where d is the size of via hole. If a signal encounters impedance discontinuity, it will generate jitters in PCBs and hampers the signal integrity. We will also tell you by how much you can. 2. Let's consider the impedance for copper at 1 MHz. Obviously, there is no ground on the bottom side. Maximum Unambiguous Range Calculator. Via impedance Via step response Via DC resistance Via impedance Via resonant frequency Via thermal resistance Via voltage drop Via power dissipation in dBm. They are very simple to read, and the values in. Figure 24. Tool calculations are based on the IPC-2152. trace width and thickness, distance from other copper features, dielectric constant, and dielectric thickness or distance to reference plane of the board material all contribute to the impedance of a. These important design features are. 78 mil. A transmission line should have a uniform characteristic impedance. PCB Trace Width Calculator. High-speed PCBs operate in the range of. Where I is maximum current in Amps, k is a constant, dT is temperature rise above ambient in °C, & A is cross sectional area of trace mils². By inputting the trace width, substrate height, dielectric constant, and substrate thickness, engineers can obtain the characteristic impedance and effective dielectric constant of a microstrip transmission line. 4 mm. For a standard FR-4 substrate with a dielectric constant of around 4. The information should include the impedance value, the trace width, the spacing for. If the ratio is about 0. 22mm. 2 High Speed USB Trace Spacing Figure 2-1 provides an illustration of the recommended trace spacing while Table 2-1 gives some trace calculation examples. These calculators give. If you need to mass produce PCB's at low cost, the minimum trace width should not be pushed too hard. Once you know the characteristic impedance, the differential. It is not always possible to adjust trace length and width, hence implementing lower copper thickness is one of the feasible ways. 393 mm, the required trace width for this particular inductance value is w = 0. The wider a trace is, the easier it is to fabricate. A 20 mil trace will have a much greater tolerance for losing metal than a 3 mil trace would. Adequate trace width is necessary to ensure the desired amount of current can be transported without overheating and damaging your board. However, at this time, I don’t know of a good way to do calculations for wagon wheel spokes. Calculates the characteristic impedance and per-unit-length parameters. A higher Dk value also leads to higher dielectric loss. Altium Designer includes a PCB trace impedance calculator, PCB trace width calculator under IPC 2152, and a plethora of other important design tools. To update trace width, select the traces of interest and use the "Route > Retrace Selected" command. The calculator below uses Wadell’s. The edge couple differential microstrip transmission line is a common technique for routing differential traces. This Mantaro calculator tells me that I need a trace width of 11. The following formula is used to calculate the differential impedance of a microstrip: To calculate the differential impedance of a microstrip, divide the characteristic impedance of the microstrip by 2. Dielectric Height (H1) ( mils ) Dielectric Constant (ER1) Trace Information . The JLCPCB Impedance Calculator computes track width values and recommended stack-ups from user-input values of board layer, thickness, copper weight, target impedance, trace spacing (for edge-coupled pairs), and impedance trace to copper gap (coplanar waveguides). Calculations are based on formulae from IPC-2221. copper trace on a 4-layer board with 8 mil thick dielectric and Dk = 4. To get a 50 Ohm characteristic impedance, you just have to define your trace width in the proper proportion to the H of your. To calculate the trace width/spacing, I used SaturnPCB. 024 x dTI = 0. Note: The trace on the inner layer need to be much wider than the trace on the outer. What's Inside. 8mm 1. Access technical papers, white papers, calculators, tools and more for circuit laminates, prepreg and bonding materials. 5mm, T=0. Note: Actual impedance during manufacturing can vary by 5%/10% due to micro-level trace width changes (due to temperature variations) during the manufacturing process. ε: Dielectric constant of the PCB material. Calculate Minimum Trace Width. And this is enough to initiate low-level oscillations. The Fairchild application note also says that the differential characteristic impedance of the D+ and D- lines should be 90 ohms. Knowing that the test cable and the test output are 50 ohms, it is possible to use Equation 3 to calculate the impedance of the trace under test. We recommend the software from Polar Instruments if you want to get exact impedance calculation. Computes trace width, maximum temperature rise above ambient, and current capacity; Calculates resistance and voltage drop across a given trace length Impedance trace widths based on Bittele's standard Stackups. β2 = 0. They include conductor spacing, creepage, and insulation requirements. A cross-hatch plane is shown in the image below. PCB Trace Impedance Calculator. In this demonstration, we’ll choose uncoated microstrip single-ended impedance calculator. It gave me a trace width of 6. 2. Geometric Parameter Definitions: JLCPCB Impedance Calculator. 41)] * ln[5. We Offer a Wide Range of PCB Capabilities to Fit All of Your PCB needs. UL Certification - Flex & Rigid Flex PCBs. 015mm. Vacuum press in. Qorvo Calculators and Design Tools MatchCalc Qorvo MatchCalc is a free downloadable RF/microwave matching calculator with ideal tunable passive components. 1kOhm, 1% tolerance: Brown Black Black Brown Brown. 254mm. o use this calculator, enter the parameters of the regulator . For your convenience, we have designed a Impedance Calculator to help you calculate the impedance and trace width you need. Use a 4-layer board so you can achieve h ~= 0.