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# Measure Input Capacitance

28 Threads found on edaboard.com: Measure Input Capacitance

## How to measure the input capacitance and output capacitance of a MOSFET

Apply the same AC voltage to gate and drain, measure gate and drain current separately.

## measuring high voltage/power

Here I used HF CT to measure current on ground strap and large capacitance transformer ( not shown) to measure 50~100kV voltage impulse with C ratio that scales voltage down to safe levels for 50 Ohm termination inside scope. High quality coax is critical. Here V impulse is 10V input 50 Ohms or 2 watts which when (...)

## [Spectre calculator] How to calculate input capacitance of a 2 ports network.

Hi, i usually measure cap with ac analysis in cadence, but your way is also working :) So, i've created cellview: 107582 ADE window -> Tools -> Calculator value(imag(ypm('sp 1 1)) VAR("Freq") )/(twoPi*VAR("Freq")) You can place just freq value instead of VAR("Freq"). That's my result: [CO

## Capacitance measurement using pic18f45k22 by using CTMU

The following demo code utilizes the CTMU to measure the value of a capacitor attached to an ADC input channel: Charge Time measurement Unit (CTMU) In this code example, CTMU module in PIC18F4685 is used to calculate the capacit

## Measuring Input or Output Capacitance of a buffer

Hi i am trying to measure the input and output capacitance of a buffer stage (for example) as i need to measure several other stages i set up the following circuit 104476 and i set the input voltage to 1.2 with AC Magnitude and Amplitude to 1.2 , also vdd is set to 1.2 then i calculated Zin = (...)

## measuring buffer delay in cadence

measure the delay for 2 or more known load capacitances. Plot delay vs. capacitance and extrapolate for Cload=0 .

## impedance matching for saw sensors ()

hi everybody, i'm new in RF design and I want to transfer the maximum power for generator (50 ohm source) to saw sensors so i want to create a board with Mstrip line for matching circuit. So if we suppose that's the saw is a pure capacitive load of 0.58Pf (measured) I think to add a inductance to recompance it but I don't get a good result when

## LDO at no load condition

No load instability is common in SMPS and 10% pre-load activated by current sensor, may be needed. Overall open loop phase margin should be analyzed to improve stability to determine which capacitance and/or input ESL affects the results. Alternatively put on the minimum load for stability and measure the % overshoot on step loads and (...)

## How do I measure the input capacitance of an Inverter?

Dear all, I want measure the input capacitance of an inverter for the vinput range of 0 to 3.3 V I am following the approach mentoined below: 1. at the input of the inverter I connect a dc voltage in series with a ac source. 2. then I am doing a parametric analysis (sweeping the dc value from 0 to (...)

## LTspice - inverter input capacitance

Hi, I'm trying to measure input capacitance of simple inverter, and I have some problem... Using the following statement: .meas ac Cdb max(I(Vin0)/(2*3.1415*frequency)) Result of this measure is ok, but it is in dB, and I don't know how to translate it to linear scale. I tried something like this: .meas ac Cin (...)

## how to determine RF receiver input impedance

Use a VNA to measure the input impedance and design a matching network. Or at that frequency you can rely on the fet device model from the manufacturer.

## LM2101 output waveform

I don't know the LM2101: what is it ? However where do you measure the distorted waveform, at the output of the LM2012 (gate of IRF520) or at the output of the circuit (I presume the 50 ohm resistor) ? In the first case, take into account that the IRF520 has a quite high input capacitance (350 pF), it could be that LM2101 is not able to (...)

## resistance in voltage measurement path, work around.

If you measure V1 with a DVM, this will have a 10 megohm input impedance so the extra current, will be very low, and as you know its a 10 megohm resistor you can compensate for it in your calculations. Frank

I'm using SP720 for analog circuit protection in a number of instruments since about 10 years. I must confess, that I didn't yet measure the devices crosstalk capacitance (input pin to input capacitance), but I won't expect a value above 0.1 pF or so. In other words, the external circuit crosstalk (...)

## How to measure the cpapcitance of a FET

Hi people, I wanted to ask whether anyone here could suggest me the method to measure the input capacitance of a MOSFET in cadence or in ADS. falcon

## How can i measure inverter input capacitance in Hspice simulation?

Hi everybody. Is there anyone how can guide me to measure input parasitic capacitance with HSpice simulation? Thanks in advance. Alireza

## Photodiode Measurement with PIC, Help

Im measure adc pin with a multimeter but it gives good values. So the problem is either with your code, or the analog input pin is damaged. I tried feedback capacitance but nothing changed. Yes, an oscillating OP output should still give an ADC signal. Simply keep in mind, that a compensation cap will be necessary f

## How to measure the frequency response of TIA

The question is about a real measurent rather than simulation, if I understand right. In this case, the usable resistor frequency range is mainly limited by it's parallel capacitance. For 1 MOhm, it will be a few MHz at best. On the other hand, the "current source" resistor must be large compared to the TIA input impedance in the frequency (...)

## switching speed... and the switch driver

Do a simple tran.. measure the input cap of both the switches or just the second switch.. that can be considered as the load for the prev stage..and then resize your previous stage to meet ur timing.

## [50 pts]Capacitance and resistor measurement with Spectre

Hello Edaboarders, I need help regarding the using of Spectre to know: How to mesure gm of a circuits ? How to measure the input/output capacitance and resistor of a circuits ? How to plot the caracteristic of a varactor ? 50 pts to be given for helpers. Merci.