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## Input Impedance Measure |

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measure input impedance , measure negative impedance , measure impedance differential , measure output impedance

measure input impedance , measure negative impedance , measure impedance differential , measure output impedance

149 Threads found on edaboard.com: **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

RF, Microwave, Antennas and Optics :: 06-24-2017 11:20 :: joshuacp :: Replies: **11** :: Views: **1993**

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** (...)

Electromagnetic Design and Simulation :: 02-12-2017 21:05 :: BradtheRad :: Replies: **1** :: Views: **421**

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.

RF, Microwave, Antennas and Optics :: 08-13-2016 13:20 :: FvM :: Replies: **1** :: Views: **352**

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 (...)

RF, Microwave, Antennas and Optics :: 05-11-2016 07:54 :: prateek3790 :: Replies: **6** :: Views: **2059**

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 (...)

RF, Microwave, Antennas and Optics :: 04-26-2016 09:32 :: vfone :: Replies: **4** :: Views: **741**

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 **impedance**s of a circuit also seeing that (...)

Analog Circuit Design :: 03-07-2016 09:17 :: matrixofdynamism :: Replies: **3** :: Views: **608**

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.

Digital Signal Processing :: 02-24-2016 07:32 :: FvM :: Replies: **5** :: Views: **696**

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 (...)

RF, Microwave, Antennas and Optics :: 11-15-2015 03:33 :: Puppet1 :: Replies: **1** :: Views: **622**

What kind of **measure**ment 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 (...)

RF, Microwave, Antennas and Optics :: 10-15-2015 15:11 :: FvM :: Replies: **3** :: Views: **447**

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** (...)

Analog Circuit Design :: 08-20-2015 18:28 :: SunnySkyguy :: Replies: **4** :: Views: **670**

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 **measure**ment device usually has a finite **input** **impedance**, so the (...)

Elementary Electronic Questions :: 06-22-2015 09:48 :: KlausST :: Replies: **1** :: Views: **515**

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 !!!!

RF, Microwave, Antennas and Optics :: 05-15-2015 17:32 :: Arend2 :: Replies: **4** :: Views: **951**

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 **impedance**s are found by termination (...)

RF, Microwave, Antennas and Optics :: 04-20-2015 14:52 :: BigBoss :: Replies: **2** :: Views: **1096**

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.

RF, Microwave, Antennas and Optics :: 02-06-2015 09:57 :: cyberjok :: Replies: **2** :: Views: **672**

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 (...)

RF, Microwave, Antennas and Optics :: 02-03-2015 06:49 :: rf1008 :: Replies: **2** :: Views: **596**

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,

RF, Microwave, Antennas and Optics :: 12-02-2014 11:31 :: kela3kela :: Replies: **0** :: Views: **1239**

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 (...)

Analog Circuit Design :: 11-29-2014 23:08 :: barry :: Replies: **3** :: Views: **1135**

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 (...)

Analog Circuit Design :: 11-18-2014 04:32 :: SunnySkyguy :: Replies: **3** :: Views: **849**

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.

Software Problems, Hints and Reviews :: 11-17-2014 13:19 :: skt.82 :: Replies: **0** :: Views: **747**

Troubleshooting boards that are inoperative
To test each stages IC **input**s 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** (...)

Elementary Electronic Questions :: 10-12-2014 05:55 :: ParkerMike :: Replies: **9** :: Views: **3007**

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