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Measure Input Impedance

149 Threads found on edaboard.com: Measure Input Impedance

True Large Signal Differential Input Impedance Evaluation

For True Large Signal Differential input impedance Evaluation, we must use the true differential mode and the VNA must support true differential mode, that is to say, every port of VNA must have its own VSG and

[Moved]: dark and illuminate current of a photo diode in a

Do you measure its output as current, or as voltage? To measure output as current, you need a loop of some kind for the current to flow around. It's likely that photodiode output is easier to measure as a voltage, instead of as a current. Photodiode schematics commonly show one terminal going to a high-impedance (...)

[ASK] Help me measure this graph

Hello everyone, I need help to learn the existing graph below : Figure 1 131529 Figure 2 131531 and what answer for this ?? 1. Why on the third draft of the array 4x1 has a different shape compared to the array of 2x1 or single element? 2. Why is t

measuring impedance using spectrum analyser

i do not have a network analyzer, but i want to measure the input impedance at one of the sma connectors of my ic(supposed to have seen 50 ohm). i have seen some post which can give a basic idea about the matching but they all require tracking generator but is there any other way by which i can see whether the impedance is (...)

problem with txline and manufacture of microstrips

Hi everyone! i have developed some microstrips, coupled mslines and cpwground with the software txline. my values for the parameter are: (here example for microstrip) Dielectric: RT/Durdoid 5880 (i have choose it for FR4 with dielectric constant 4.3) Conductor: copper impedance: 50 Ohm Frequenz: 2.87 GHz Height (dielektrikum):

How can one pracatically measure input/output impedance of a circuit?

also seeing that these are impedances and not resistances? Consider Z = R + jX In the general case, an impedance is comprised of a real (R) and a reactive (X) impedance part, forming a complex quantity. So what do you mean with "impedance not resistance"? Obviously a real impedance is easier to (...)

measuring energy of incoming pulse

measure the energy of the pulses. This could be voltage, or Amperage, or Watts. It's possible to get data by measuring voltage across a resistor which acts as a load for the incoming pulses. Is there a particular unit which you need for your readings?

How to Measure Tank Impedance of LC Tank in Cross Coupled CMOS Oscillator

Hello, I am designing a CMOS LC Cross Coupled Oscillator in ADS. How do I measure the Tank impedance in ADS - What testbench and set up would I use - would I just measure the input impedance using Zin. I also want to measure the Q of the tank as well to compare both to my hand (...)

How to measure the line impedance

What kind of measurement instruments do you have available? You can terminate the transmission line with a resistor in the range of the expected transmission line impedance and measure the input impedance versus frequency. ZL can be determined from the observed minimal and maximal (...)

Impedance measurement scheme

circa 70's-80's , I used to measure input impedance by using the scope X sweep out on the back to drive an FM input sweep generator then examine the envelope ratio on the scope for a linear frequency response. I got fancier by using X sweep out into Channel 1 then use CH1 Out on back of scope to FM input (...)

Can we measure floating voltage (of power supply) with reference to chassis ground?

Hi, read below "similar threads" In my eyes measuring this voltage makes no sense, because it is "floating". The voltage ins inpredictable an may change any time. (Caused by airflow, humidity, touching, connections of other floating devices...) Additionally the measurement device usually has a finite input impedance, so the (...)

Transmission Line Input Impedance by monitoring the voltage over the line

To measure the ratio of Z0 to Zi, the standing wave ratio on the line has sufficient information. But a slotted line can be also used to determine complex impedances by using the phase information. This has been in fact a state-of-the-art method of RF impedance measurements before vector network analyzers became available.

how to measure input impedance of gilbert mixer in cadence

If you don't have too much experience doing VNA differential measurements (and simulations), would be better to use a balun because you can choose the right impedance ratio of the balun, as in the list below from TDK: For using a simulator, TDK provides the S-pa

complex impedance covert to RL OR RC circuit

thanks for your input. i know how to calc them, but i want to use a VNA to measure some small rf compnents, so i need a tool. :) maybe i can built a simple program to calc them.

How to measure and obtain input impedance by R//C model

Hi all, Maybe you've found one input impedance of some RF or microwave device by the model of R//C,for example, the SAW filter is the most popular device in handset phone system and the input differential impedance of SAW filter is often the R//C or R//L model,such as 150Ω//82nH. My question is that how i can (...)

[CST MWS] How to Find input impedance of schottky diodes via simulation

Hi everyone, Can someone tell me the best way to simulate and measure the input impedance of a Schottky diode in CST MWS? It's an Avago HSMS-285X and a SkyWorks SMS7630 diode. The frequency range is commercial GSM/WLAN. Thanks,

Battery voltage divider to get hundreds of ?V levelse to measure ADC offset.

Hello. I'm trying to determine the offset of the ADC in my arduino Due, 3,3V reference 12bit SAR ADC. I can put on a small voltage without any transition from 0 reading but I want to know how little it is, 3300mV/4095=0,80586≈806?V LSB My brain does not literally work always as it should and today I can't figure out the simplest of thi

Return loss vs Gain level

The measure of good performance is good attenuation on the input reflection or in other words high Return Loss. Since it is loss a positive number is used. RL=15dB is generally considered minimum acceptable for simple circuits. impedance is geometric ratio of conductor width to gap to nearest grounds. Uniformity is key and matching (...)

HSPICE Software/Current Conveyor

I want to measure the input and output impedance (parasitics resistane at X, Y, Z port)of a current conveyor (CC-II) using HSPICE. Please tell me the method.

IC op amp input resistance or impedance measurement

Troubleshooting boards that are inoperative To test each stages IC inputs and output incircuit I tried using my Digital meter and set it to ohm to measure the IC op amps input The IC op amps input pins should be in the meg ohms from the the datasheets say for a 741 op amp out of circuit input (...)