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28 Threads found on edaboard.com: Measure Input Capacitance
Apply the same AC voltage to gate and drain, measure gate and drain current separately.
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 (...)
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
i am working on project in which i require the ASM program of capacitance measurement using pic18f45k22 by using CTMU. please help me for solving the problem.
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 = (...)
measure the delay for 2 or more known load capacitances. Plot delay vs. capacitance and extrapolate for Cload=0 .
If this capacitor is series you should add an inductor in parallel.If it's parallel, you should add an inductor in series. Depends on capacitance configuration. But I'm not sure that the input impedance becomes purely capacitive.Because SAW filters generally have an input impedance with a real part by their nature. There might be a (...)
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 (...)
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 (...)
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 (...)
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.
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 (...)
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 (...)
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
Hi everybody. Is there anyone how can guide me to measure input parasitic capacitance with HSpice simulation? Thanks in advance. Alireza
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
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 (...)
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.
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.
The answer is simple and easy: Use the definition of the parameter you want to simulate. In your case: According to the definition of the transconductance you should measure (simulate) the change in output current devided by the corresponding change in input voltage. By doing this, you have two alternatives: 1.) DC analysis: Simulate the output-i
Read datasheet on actual CMOS circurit, try to find spice model on used circurit or last step - measure itself with network analyzer or simular measure bridge tools (need high skill measure knowledge)... Cmos circurit exist in many generation (to speed increase over year) and you must read exact value from data sheet for used circurit, (...)
Not simulation. I want to know some input pin's capacitive loading. Just probe the input pin and gnd using RLC meter? Is it ok?
Increase the input voltage linearly, and measure the input current. Then C = I / (dV/dt) Vin in 0 pwl 0 0.0 10n 2.5 .meas tran imax min I(Vin) .meas tran Cin param = '-imax / (2.5/10n)' .tran 10p 10n
Hello, I wish to measure circuits at high frequencues (~10-30 MHz), I was wondeirng if anyone could possibly outline a method of accurately measuring the input impedance & capacitance of an oscilloscope probe so i can have some confidence in the measurments I take. How can i cancel out the impedance/capacitance effect (...)
Hello, I wish to measure circuits at high frequencues (~10-30 MHz), I was wondeirng if anyone could possibly outline a method of accurately measuring the input impedance & capacitance of an oscilloscope probe so i can have some confidence in the measurments I take. How can i cancel out the impedance/capacitance effect (...)
You can consider a Schottky diode to be a large signal device. That is, its impedance can vary drastically as the RF power incident on it increases. If very little power is incident, the diode is reverse biased and looks like a very small capacitance. If enough power is incident, the diode conducts current for part of the input sine wave, an
to measure the input capacitance you may drive the port with a current. So, by measuring the time it takes the signal to go between two different voltages you can deduce the input capacitance. I=C . dV/dt You must be sure that the parasitic capacitance due to interconects is (...)