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25 Threads found on edaboard.com: Thd Measurement
hello !! how can i measure HD3 ,thd, IIP3, IIM3 using cadence analog environment for cmos ota design please reply soon......its urgent thanks in advance :)
fundamental, pure sine wave= 50hz 2) harmonics injected= 100 hz ( ie, 1st harmonic) ( harmonics is the integral multiple of fundamental wave) then we add both pure and harmonic , to get combination = distortion ( shown in gragh as combination) then we pass through filter, and reproduce pure sine wave. now here,, next step is to find out
Hi hojongch, This is another method: If you can measure the total power (usually this is done in time domain) and the dc and 1st (funtamental) components, you have Harmonics_power = Total_power - DC_power - Fundamental_power It this way, in theory all harmonics are included. The problem is that in the case thd is low, as this is calculate
Hi this link is reference to the subject of this post, I interesting in any document that learn in how to measure and testing the amplifiers like IHF (Institute of High Fidelity) , Power, thd, TIM, frequency response, etc..... any information is welcom org is dedicated to te
hi guys, i am writing a code for measuring thd(total harmonic distortion) in a three phase power meter.can anyone explain what is thd and upto how many harmonics can be measured ? i want measurement upto 41st harmonic
I agree with fxxjssc. Record the data and code a simple fft routine in matlab. Also you can use the National Semiconductor WaveVision 4 software. This software is inteded for their boards, but it has the capability of importing data from files (like .dat .txt etc). Since it uses the fft algorithm you ne
You don't measure the input power. It's actually V1*I(V1). As a hint: You can also determine the power factor from an I1 fourier transformation respectively thd measurement.
You can of course use ADS for audio amplifier simulations. thd is the sum of harmonics' amplitudes.( Look at thd formulae)So, if you do a HB simulation, you'll find the amplitudes of the harmonics and ADS won't know how type of circuit you simulate.There is no practical difference to simulate a Microwave amplifier and Audio amplifier from aspect o
thd measurement is used to analyze AC signals. I think you dont need thd measurement because your output is DC. You just need to meter output voltage ripple. This measurement will show u quality of the SMPS output. Your output will be DC + AC(ripple). So your main signal is DC and some AC ripple. You dont (...)
I am looking for references on how to calculate SNR, thd?.. for audio applications. For example, if one wants to find the SNR of a condenser microphone what does he/she consider as noise? Does noise include the distortion caused by the non-linearity of the condenser or is noise the floor when no input is applied. I am asking since for example conde
Deep Nwell provides you with a mean to isolate NMOS bulk by placing a Pwell into it. It could be very effective for noise issues, and also to improve linearity and thus thd of your amplifier when you're using an NMOS differential apir within your amplifier. But you should be carefull using it, because it is area consumming, so use it only wh
There are several ways to measure the SHA in the lab: 1) Direct measurement: if your SHA can drive 1Mohm impedance, then you can hook up your SHA to the spectrum analyzer and measure the thd, SNR, etc; 2) Indirect measurement: have another ADC with higher accuracy and higher bandwidth. But you need to be careful about the possible (...)
I have designed and measured my own adc chip. Also I have measured a commercial adc chip. My chip shows very low ENOB because of high thd. The difference between my chip and commercial chip is harmonics. My chip also has proper SNR, but SINAD is awfully low. Commercial chip has almost same SNR and SINAD. Where come from this probl
Hi, I am trying to measure the above mentioned dynamic specs of an ADC in Spectre. My ADC is a pipelined, 8-bit and operating at 80MSPS. What i am doing is giving a sinusoidal input of 9MHz and sampling frequency of 60MHz. The input frequency i decided using fin/fs=Mc/M formula. I am using transient simulations with strobestart=1/60MHz and strob
hi can anyone give me some reference books or examples? thanks
I have some questions for help. 1. How to simulate the nonlinearity of a relaxation oscillator. 2. Why some papers use HD2 to descripe the control linearity of a oscillator instead of the thd or HD3. 3. what's the difference between ' .fft , .four ' 4. What type of jitter can be measured by eye diagram? Is it cycle-cycle jitter? Please, hl
Hi,everyone! I have a quesition about Cadence: I do not kown the difference between the component parameter sweep and model parameter sweep and how to use Cadence to test total Harmonic distortion(thd)? thank you very much!
Dear All, thank you for reading this topic. I just design an OTA and I will conect it to a capacitor to build a lowpass filter. Then I will put a 100mV sine signal at the input and want to see the harmonic distortion at the output. Does anyone show me the procedure that how can I get the result? A sample is put in the attchment and t
Hi, I have got a problem with my sinus generator based ona a Wien schematic and amplifier,that should work between 1Hz and 20kHz, I've tried everything, I need to get Total Haramonic Disortion <1% and this is my main problem:/ 1.) Should the oscillator be tunable between 1Hz and 20 kHz ? This will be very difficult to
Hi, I want to make a circuit which measures: voltage(ph-ph and ph-n) current (each phase and current of neutral) Frequency Cos fi . . . and if possible thd. Is there any chip that measures these parameters from 3phase wire and give me the result digitally in order to connecting to micro controller(such as avr). measurement of curr
Does anyone have implemented the codes below?I'm thinking that i put a sine wave as input of my 8-bit ADC and take directly the output of my i right? and lastly how the file test.load look like or how is the arrangement of the data inside? This is necessary because i need to convert a .mat file into .dat file.. Thy in advanced
I have a paper stating that if one is to measure the Total Harmonic Distortion (thd) as a ratio of (input signal amplitude RMS) / (mean) then that is the SINAD for a DFT with Nyquist BW (fsample/2). This is all well, but I have a system with a Anti-Aliasing filter before the DFT that is less than the Nyquist BW. How sh
All you need is schemaics and hex code which are available. Circuit is simple, it can be assembled even on a vero board Would a sound card based oscilloscope/spectrum analyzer/signal generator be a better choice for audio test & measurement? The reason is that a good sound card can provide 192kHz sampling rate, 24 bit ADC and DAC, very good SNR,
Hi All, Almost all literature refer to compression point and intercept point measurements in terms of input&output power. When simulating a simple 2stage opamp, that has been designed to drive a capacitive load, how do you setup the simulation for input & output power ? Thanks
check the operating region of your transistors. if you get acceptable linearity of say 1% thd for very small signal amplitudes (10 20 mv ) its because your transistors are operating in weak inversion. if transistors are biased in strong inversion you will be able to get the same thd for much higher signal ampliutudes therfore higher linear range