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149 Threads found on Input Impedance Measure
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
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 (...)
Seeing different return loss numbers only means that the antennas have slightly different input impedance. The image might change completely with small variations of the matching network. The most significant information is that the 4x1 array has larger bandwidth.
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 (...)
S11 of the antenna and the transmission line impedance, they are different things. measure the impedance of the transmission line alone, and later measure the input impedance of the antenna without the feeding transmission line (if is possible). measure the real Er of your (...)
The terms input impedance and output impedance are used quite often when it comes to amplifiers or when cascading circuits together to determine how each will load the other. While it all makes sense on paper, how can one measure the input and output impedances of a circuit also seeing that (...)
Energy is the integral of U x I. I presume we are dealing with constant load impedance, e.g. 50 ohm. So you get E = ∫V?dt. Means the input signal has to be squared before integrating/averaging, either in the digital domain or by analog means.
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 (...)
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 (...)
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 (...)
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 (...)
Dear, Is possible calculate the imput impedance of a line (unknow Zo) just using the voltage values over the line (graph V versus position) and knowing the load impedance Zl (in my case pure resistive) ? THANKS !!!!
LO input impedance has less importance compare to RF/IF input impedance because LO port is driven hardly to commutate the mixer pairs.RF/IF input impedance can be found easily by s-parameter simulation or LSSP simulation.Differential impedances are found by termination (...)
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.
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 (...)
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,
You are asking a lot of totally different questions. 1) The input impedance of your ADC has to be much greater than 13k (the impedance of your resistor string), or it WILL affect your reading. That's just a simple parallel resistance calculation. I would buffer it with an opamp. 2) Worst case error will be about 1.9%. Assume all (...)
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 (...)
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.
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 (...)