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32 Threads found on edaboard.com: Adc Snr Fft
Hi, I have designed an adc in cadence virtuoso and i want to calculate the metrics such as snr,SINAD,ENOB etc. For example i want to calculate ENOB. I read everywhere that i need to do an fft my input, or simply use the spectrumMeas function. So i am using a sinuid input of 875MHz as fin and 2GHz as flck. In the field in spectrumMeas i use (...)
hello i was simulating of a first order adc using code given in book of richard scherier. for calculating snr he uses (page 265) snr = calculatesnr(spec(1:ceil(Nfft/(2*OSR))+1), tone_bin)... where spec is spec = fft(v.*ds_hann(Nfft))/(Nfft*(nLev-1)/4); (...)
Hi, there! Recently I am testing an 8b adc and get the fft results. Then I can find the snr and SFDR as usual. But I find the HD2 of some chips is higher than HD3, the left is not. And sometimes the HD2 is larger more than 15dB than HD3, but part of them are close to HD3. So I want to know what does it mean? Are there materials about (...)
hello Eminent.Engineer, I hve also designed a delta sigma adc and i calculate the snr order to caculate the snr after the modulator you must make the fast fourier transform function (fft) by MATLAB after the modulator. About the decimation,until now i have designed the complete adc in Smulink (MATLAB) (...)
method 2 is one i have used before. i set the dac to have 2 bits mode resolution than adc.
hi folks. i am trying to test the 10 bit pipelined adc schematic i designed. The procedure i am following for finding the SNDR is " take a sinusoidal input signal nearer to full scale range.Using an ideal DAC reconstruct the signal. Plot its fft ,say for 1024 points,take those values and find SNDR, THD, SFDR , snr from matlab by giving (...)
hi, all, i design a adc, and now it is tested, but i have no any software to get snr and THD+N THD..., but some digital data is sampled from a logic analysis device, and a piece of MATLAB procedure is need to get snr, THD+N, THD and the fft figure, but i can't compile the procedue. can you upload the procedure the (...)
hiiiiiiii I'm working on sigma Delta adc CAN ANY1 PLEASE HELP ME ON WORKING WITH CADENCE SPECTRE FOR snr CALCULATION HOW MANY CYCLES I SHOULD RUN THE TRANSIENT ANALYSIS?? IN ORDER TO CALCULATE snr PLEASE HELP ME IN FIGURING OUT THESE VALUES... how to come to conclusion to fft fundamental frequency of input (...)
I remember calculating SFDR for 100 Mhz adc. I see if I can find the C code for it and extrapolate equation and post it here. That might help you on the snr.
I have tried to estimate the snr of the sigma delta conversion after the sinc^3 filter and got lots of noise at the low frequency end. It looks like the opposite of noise shaping, see attached. When fft of the bitstream is plot the snr is almost twice as high for the same frequency. Am I using the sampling rate a lot higher than the signal I (...)
Dear All, In N-adcs why we need to follow coherent sampling method for calculating snr. Bye.
Hi guys, I am currently designing a column parallel single slope adc for a CMOS image sensor. I have done the DC, AC and Transient analysis. I am aware that I need to do .fft to determine the snr and ENOB. Are there any other simulations that I may have missed? Appreciate all the help I can get. Thank you all! hyuuga_patik
ideal adc + actual DAC the input signal is sine wave then fft the output signal of the DAC
Hi all I use the HSPICE to simulate the whole pipeline adc. I want to check its snr. So i run the tran. simulation with 2048 points, then transfer the .tr0 file to matlab to fft to get the snr value. If i use 0.01ns transient step in tran simulation, the fft results is about more 60db (My (...)
HI... I AM PRASADH, I AM DOING MY PROJECT ON FLASH adc IN CADENCE.. HOW CAN I DO THE fft ANALYSIS IN CADENCE SPECTRE FOR MY CIRCUIT.. ACTUALLY I HAVE TO MEASUER SFDR,SNDR FOR MY CIRCUIT . CAN ANYONE HELP ME PLEASE.... THANK YOU
Hi, I have some question regarding the script I got. Part of it is as follows: . . . % Create the minimum, 4-term Blackman-Harris window for fft pwr_win=0; for i=1:Nt %where Nt is the no. of fft bins window(1,i)=0.35875-0.48829*cos(2*pi*(i-1)/Nt)+0.14128*cos(4*pi*(i-1)/Nt)-0.01168*cos(6*pi*(i-1)/Nt); p
HI all i am simulation a pipeline adc. I give a sine input, and do .tran simulation in hspice. Then catch the 10-bit digital code to do fft in matlab. Then i want to know, the fft results can give the snr results? And is the noise compont included in the tran simulation results? What performance of (...)
You should place an ideal DAC after adc (DUT) to get the analog output and simulate what you need :)
for calculating the SFDR for an adc . coudl u please tell me the origin of this spurious signal .. in adc
Hi, I am working on sigma delta modulator based adc. I have output bitstream from the modulator and would like to measure snr and SNDR using fft. How could I possibly separate the signal and noise from the output of modulator? Also, is there anyway to separate the noise and distortion from the total noise from the modulator output (...)