68 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 :)
Analog Circuit Design :: 15.03.2009 17:05 :: shweta_eda :: Replies: 4 :: Views: 1237
AudioGuru, please suggest other opamp(s) which are in your mind. I'll try to find them in our market.
There are thousands of excellent opamps here that I can buy but they are probably not in your "market". I don't know what is available over there. Why don't you ask people over there?
---
Electronic Elementary Questions :: 20.03.2011 18:59 :: Audioguru :: Replies: 159 :: Views: 6779
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
Power Electronics :: 06.04.2011 08:32 :: rashmi venugopal :: Replies: 1 :: Views: 306
If we calculate Total harmonic distortion(thd), we need to obtain the spectrum data which has 2nd,3rd,4th, n th harmonic data. I am wondering how many nth harmonic data we need to include to obtain thd value(% or dB).
Original signal from function generator is 100MHz 0.2V and I obtained 5th harmonic in the oscilloscope. 5th harmonic one is aroun
Electronic Elementary Questions :: 18.05.2011 02:18 :: hojongch :: Replies: 2 :: Views: 482
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
Analog Circuit Design :: 20.05.2004 07:19 :: MCMC :: Replies: 0 :: Views: 793
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
Electronic Elementary Questions :: 23.01.2006 12:04 :: saudrehman :: Replies: 2 :: Views: 4172
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
Analog Circuit Design :: 25.02.2006 17:40 :: gsuarez :: Replies: 2 :: Views: 632
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
Analog Circuit Design :: 06.03.2007 06:42 :: vijay_nag :: Replies: 14 :: Views: 8610
Because the input voltage can have various other shapes (e.g. modified square, trapezoid, distorted sine wave), you may
want to specify a clear criterion for the decision. Depending on it's purpose, either the relation of peak to rectified average
voltage or the harmonics level (thd) can be measured.
Hobby Circuits and Small Projects Problems :: 24.01.2010 14:01 :: FvM :: Replies: 16 :: Views: 3972
How can i improve its sine wave? (like it's clipping from the edges).
The waveform is not clipping. Your simulation uses an inappropriate large timestep. The difference can be easily seen from the
waveform. You have to force the simulator to a suitable time step to determine the actual waveform. With Multisim, you can use
Analog Circuit Design :: 27.03.2010 17:40 :: FvM :: Replies: 26 :: Views: 3520
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.
Analog Circuit Design :: 04.08.2010 16:00 :: FvM :: Replies: 3 :: Views: 734
hi,pz5921087:
I simulated the thd of codec DAC in cadence before,and used the calculator provided by cadence. I confused by the thd results also, I quitely doubt the reliability of the simuation results of thd. Because the thd results of calculator and of a cell from analoglib is not the same. And when the subject is (...)
Analog IC Design and Layout :: 30.03.2011 05:40 :: hank_deng :: Replies: 2 :: Views: 500
Hi all,
This is my first post so I just wanted to thank you all for all the stuff you have put up here, it has helped me a lot and I hope I can at least give back as much as I learned...
So I am designing a linear low frequency amplifier and I am looking for an expression to measure the gai
Analog IC Design and Layout :: 05.04.2011 21:34 :: Mamdos :: Replies: 0 :: Views: 533
Visual Analyser 2011 XE
True 2ch. oscilloscope, spectrum analyzer, frequency meter,
voltmeter, function generator and distorsiometer
Detailed Features about:
Oscilloscope (dual channel, xy, time division, trigger);
-- Bandwith : depends from your soundcard (typical 20 Khz) up to 96 Khz (192 Khz sampling frequency)
-- Resoluti
Software Links :: 28.05.2011 12:50 :: kak111 :: Replies: 3 :: Views: 178
I have a Class-G audio amp, ad it has thd issue, so I want to simulate it in ADS.
It's really difficult to simulate thd in ADS?
Does any one has a example?
Audio signal: 100Hz~20KHz, Class-G clock 1.6MHz, load is 16 ohm + 33uH.
The link is audio input-->Class G amp-->load
I know use FFT can do it, but I am not familiar with MATLAB. I guess
RF, Microwave, Antennas and Optics :: 19.04.2013 10:48 :: tony_lth :: Replies: 4 :: Views: 150
We can use PMPO to discribe the max output ability of an audio amplifier.But if an audio amplifier work at that point,the thd or SNR often much bad than the rated work condition specificed @ normal RMS power. :?:
Hobby Circuits and Small Projects Problems :: 03.02.2003 02:32 :: jinboqiu :: Replies: 25 :: Views: 87599
In the process of feeding input port to a fully balanced Gilbert cell mixer, I had applied a single LO port at the switching quad, made it differential through two parallel vcvs source with a gain magnitude of 0.5 and -0.5 respectively. The input to the transconductance stage is applied in the same manner. I could measure some of the performance p
RF, Microwave, Antennas and Optics :: 21.11.2004 06:54 :: hrkhari :: Replies: 5 :: Views: 3104
You can input a sine wave that frequency is less than 40MHz. And you can get many 10bit digital output datas. You must simulate or test many periods. You can use this matlab file to caculate your SNR SNDR and thd SFDR.
fclk=80E+6;
numpt=4096;
numbit=10;
load saradcdata.txt; % Load data from disk;
a=saradc
Analog Circuit Design :: 13.04.2005 11:38 :: zwei78 :: Replies: 9 :: Views: 3214
Hi all,
I am trying to simulate ADC for SFDR,SNR,thd and SNDR. The MATLAB code is attached as below. I am new in MATLAB and couldn't fully understand the program.
To simulate, I input low frequency sinewave signal and the ADC is running at 50Ms/s. Should I take the output from the ADC or do I need to connect the output of ADC to an ideal DAC
Analog IC Design and Layout :: 18.07.2005 10:07 :: snoop835 :: Replies: 9 :: Views: 5832
Hi
For not sampled output data, HSPISE itself can calculate thd by using .four function, but if you have a sampled data at output, like in switched caps circuits, you have to use additional process, like return the output data to MATLAB, sampling at specified times and calculating the parameters or using additional software, as the other said.
Analog Circuit Design :: 28.10.2006 12:14 :: nassim_el85 :: Replies: 9 :: Views: 1963
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
Analog Circuit Design :: 10.02.2006 10:37 :: svensl :: Replies: 1 :: Views: 1251
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
Analog IC Design and Layout :: 17.02.2006 20:17 :: Mline7 :: Replies: 11 :: Views: 1405
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 (...)
Analog Circuit Design :: 31.03.2006 20:37 :: willyboy19 :: Replies: 3 :: Views: 545
Hi all,
I am trying to simulate ADC for SFDR,SNR,thd and SNDR. The MATLAB code is attached as below. I am new in MATLAB and couldn't fully understand the program.
To simulate, I input low frequency sinewave signal and the ADC is running at 50Ms/s. Should I take the output from the ADC or do I need to connect the output of ADC to an ideal DAC
Analog IC Design and Layout :: 01.09.2006 05:34 :: jeniffer :: Replies: 8 :: Views: 8263
Basicly, there is no specified input voltage conditions of Audio AMP whatever Class AB or D in datashhet. becasue the thd+N vs Po plot is almost same even with different input level. However thd+N will become a slight worse with increasing gain, at same output power, that is to say, if the input voltage gets samller, the thd+N will become a (...)
Analog Circuit Design :: 20.02.2007 13:49 :: peterwangyu :: Replies: 3 :: Views: 631
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
Analog IC Design and Layout :: 02.01.2007 13:28 :: pansoo :: Replies: 1 :: Views: 533
Hi, hung_wai_ming@hotmail.com
Of course we can. Nice to know you are also designing audio amplifier.
The amplifier is a fully differential structure with rail to rail input and output. It works in Class AB method.
Main specs:
90db open loop gain
Max. ouput power: 3.1W at 10% thd with 3 Ω load.
-80db PSRR
-60db CMRR
Analog IC Design and Layout :: 05.03.2007 01:44 :: walker5678 :: Replies: 14 :: Views: 1038
hi can anyone give me some reference books or examples?
thanks
Analog Circuit Design :: 10.04.2007 02:25 :: zxasqw123 :: Replies: 0 :: Views: 683
Thanks bigpop.... I have been asked to do the calculations in Matlab..Actually i got a matlab code which computes SINAD,SFDR... But i dont know how to feed the output from spectre to this code..
This is the MATLAB code..
fclk=80E+6;
numpt=4096;
numbit=10;
load saradcdata.txt; % Load data from disk;
a=saradcdata';
N=length(a);
%[M
Analog Circuit Design :: 01.06.2007 10:42 :: geethki :: Replies: 4 :: Views: 2895
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
Analog IC Design and Layout :: 04.09.2007 13:45 :: icpaopao :: Replies: 7 :: Views: 840
Product Website:
Download PC version:
Download Pocket PC version: is a powerful sound card based multi-f
Software Links :: 24.12.2007 14:46 :: webhopper :: Replies: 7 :: Views: 2332
10dB rule only applies when the power coefficient is constant, which is roughly true in block with single transistor and without feedback. In more complicated case, the difference is usually larger.
By the way, IIP3 is a virtual number (intecept point of fundamental and 3rd order curves extrapolated from linear region); it indicates how linear is
RF, Microwave, Antennas and Optics :: 11.06.2008 07:56 :: humbleRF :: Replies: 21 :: Views: 8895
Take a period measurement, T, and about 20 visual measurements of amplitude, enter them in Matlab and use the interp function to generate a few hundred points. Then use fft, fftshift, abs to get the spectrum. The "sampling" frequency will be 20/T. Generate a frequency scale from -10/T to 10/T, and plot the spectrum.
It is very distorted, if you'
Software Problems, Hints and Reviews :: 02.07.2008 16:54 :: Eugen_E :: Replies: 7 :: Views: 2180
Well, not true. If it's an ideal thd, you should get -infinity theorectically. Try using a smaller time step to get the thd of an ideal sine wave. You will notice that the thd improves as the time step gets smaller. Try and see.
Analog IC Design and Layout :: 24.09.2008 07:47 :: pseudockb :: Replies: 5 :: Views: 698
Use the thd calculator...
Analog IC Design and Layout :: 19.11.2009 06:41 :: present :: Replies: 9 :: Views: 1355
t is possible to use a Valley Filler circuit to smooth the DC after a rectifier. As also your sketched waveforms and literature shows, DC is not smooth, it has about 60%-65% voltage ripple.
i am wondering what the power factor would be The literature link has FFT respectively thd measurements, that can be eas
Professional Hardware and Electronics Design :: 14.01.2009 00:20 :: FvM :: Replies: 6 :: Views: 8090
I don't think it's a good idea to omit the linearization, although the FET voltage is rather low. Even harmonics are surely higher then. I found, that the circuit can achieve below 0.1% thd according to PSPICE fourier analysis, with linearization and if the rectifier filter is adjusted respectively. There are however several issues with your simula
Analog Circuit Design :: 25.01.2009 20:02 :: FvM :: Replies: 3 :: Views: 4244
This is the output waveform of load of a commerical SOHO Inverter 600VA, claiming it to be sine wave.
The waveform from 0W to 505W load changes it's shape. At even 60W load the waveform is changed a little bit from no load waveform shape. This inverter has feedback system, the feedback compensation doesn't look good to me.
Is thd a factor by whi
Microcontrollers :: 29.03.2009 17:37 :: umery2k75 :: Replies: 16 :: Views: 4234
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
Analog IC Design and Layout :: 04.06.2009 11:05 :: avr_micro :: Replies: 1 :: Views: 465
In the above answers, system linearity has been assumed by all contributors. sayurabh's question however also addresses nonlinear effects. Of course, the said simple duality of frequency and time domain can be applied to linear systems only.
When analyzing real systems, that usually have finite linearity, impulse response is most interesting wh
Electronic Elementary Questions :: 11.06.2009 13:03 :: FvM :: Replies: 7 :: Views: 1022
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
Analog IC Design and Layout :: 11.09.2009 16:09 :: kickbeer :: Replies: 3 :: Views: 2623
measurement
Electronic noise is properly measured in relative to a reference, such as watts of power. Because noise is a random process, it can be characterized by stochastic properties such as its variance, distribution, and spectral density. The spectral distribution of noise can vary by frequency, hence its power density is measured in watts
Analog Circuit Design :: 26.10.2009 07:13 :: haykding :: Replies: 9 :: Views: 4096
Did you measure the thd? It looks O.K. for a usual inverter, I think. Waverforms from the supply network are often worse. The reason is different from previous PWM scheme, I think. Also deadtimes are causing a zero crossing distortion.
Microcontrollers :: 13.01.2010 13:28 :: FvM :: Replies: 36 :: Views: 9365
Hi abcyin,
this topic has been discussed so very often in this forum, just search all the Similar topics: below; I guess you'll find the answer. If not, you should provide more exact info about your pb. (why you use periodic analysis for an OTA, which stimulus, feedBack). I think PSS & PAC aren't thought for gain & phase measurement purpose
Analog IC Design and Layout :: 22.01.2010 16:31 :: erikl :: Replies: 1 :: Views: 1117
is a good starting point for a home-brew project
Many high quality audio amplifiers may have distortion specifications below 0.1% thd
Some of the earlier HP function gen's are not that good (0.3 - 0.5%)
Electronic Elementary Questions :: 25.07.2010 22:23 :: E-design :: Replies: 14 :: Views: 1178
If read the FFT measurement correctly, it shows -60 dB for 3rd harmonics (about 0.1% thd). I don't assume, that the oscillopscope's linearity allows a reliable measuement below -50 or -60 dB. Of course, you can't see a 0.1% distortion from the output waveform.
But as mentioned above, a better filtering of the level measurement would be (...)
Analog Circuit Design :: 06.08.2010 12:09 :: FvM :: Replies: 13 :: Views: 1422
I have an ADC that samples 12-bits at 65 MHz that I'm feeding into an FPGA. At the moment, I'm just trying to evaluate the ADC. It has a typical SNR of 71.6 dBFs, a SINAD of 71.5 dBFs, thd of 93dbc. When I put a low frequency sinusoidal signal from a HP 33120A signal generator at around 100kHz I get noise that makes it hard to find the min/max. The
Analog Circuit Design :: 20.08.2010 19:02 :: rawbus :: Replies: 5 :: Views: 698
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
Analog Circuit Design :: 25.08.2010 18:01 :: wasted11 :: Replies: 0 :: Views: 377
You answered your own question.
The fact that the human ear will readily realize a change of 3db or greater is attributed to the physical characteristics of the human ear.
At what power levels? Just about any ,however above +160 dbw the sound levels are extremely harmful. The term db is an implication of logarithmic progression (which is the clos
Analog Circuit Design :: 16.12.2010 05:57 :: daver01a :: Replies: 6 :: Views: 1468
Well, where are you going to buy a lossless inductor or
capacitor? Right. Go for realism instead.
Adding a small resistor, say 0.3-2ohm (depending on the package type, trace length) is only modeling the resistance of the pins/wires and inductor coil, reducing the Q of your filter as in a real circuit. Depending on the freq
Analog IC Design and Layout :: 29.10.2010 11:59 :: fcfusion :: Replies: 7 :: Views: 661
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