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16 Threads found on edaboard.com: Spectre Snr
hiiiiiiii I'm working on sigma Delta ADC CAN ANY1 PLEASE HELP ME ON WORKING WITH CADENCE spectre FOR snr CALCULATION TRANSIENT ANALYSIS DON E WITH FIN=50HZ (OSR=64) (SINE WAVE) FS=12800HZ=CLK FREQUENCY HOW MANY CYCLES I SHOULD RUN THIS TRANSIENT ANALYSIS?? wats d funda of skipstart,skipstop, strobeperiod & HOW TO CHOOSE STROBEP
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 signal , NO. (...)
Hello friends, I'm working on a second order switched capacitors sigma-delta modulator, I want to calculate the snr of the modulated signal (output of the modulator), Please can anyone help me how to calculate the snr of this signal with the calculator of CADENCE, Thanks in advance.
Hello, I am using Cadence spectre and how do I calculate snr for ADC? Is there any direct step to do that? Thank you.
I use Diff-opamp with low rout ( while not OTA ) in spectre (using verilog-A) to construct the sample-hold amplifier for ideal pipeline ADC simulation, But I found that with this low rout Opamp, I had to set large opamp gain and GBW to obtain the desired snr/sndr. That is to say, when the gain and GBW is set to the value suitable for a certain ADC
maybe the fft algorithms are different. I always output data from spectre and fft them with the same fft algorithm as in simulink.
Do the FFT (either hspice or spectre),we get the spectrum of the signal. From the fig,we can only get the SFDR,how can I get the snr? Cheers!
Hello, Please any one help me how to find snr in spectre. Bye
hi, guys how to simulate ADC's snr, THD, SNDR in spectre or hspice ? if before S/H, there is a buffer, which spec of the buffer is important, THD or HD3? is the THD of the buffer well below 6.02*N+1.76 dB? thank you very much!
hi can anyone give me some reference books or examples? thanks
You are basically making a mistake here. The main noise contribution comes from the quantization noise which is at about 60 MHz. Some extra noise is aded due to device non-liniarities etc.... By sampling with Nyquist Criterion or nearly to that, you are not allowing the noise flour to appear in your calculations. To see your noise flour to some bet
The SNDR can be calculated by the calculator in spectreRF. For the snr, you need to exclude the distortion products shown in the spectrum. Remember, it is not the distance from signal peak to noise floor -- this distance is usually called SFDR (spurious free dynamic range). Only knowing the noise floor is not sufficient, you also need to know how m
The input bandwidth of the ADC is the input frequency at which the SNDR is 3dB below the maximun value, and how can i simulate in spectre? Thanks.
Good guys: I have a question about the simulation on ADC'S ENOB with cadence spectre. How can I simulate the bit number of a pipelined ADC in spectre? Thanks.
for snr, you can use spectre .pac .pnoise and for high order(>2), should pay attention to the stability, so the out band noise gain most less the 2.5 or so.
Quote: Analog_starter Hi, how can I do snr simulation by Hspice ?? BTW, in spectre can I add .vec file into it ?? Using .fft in hspice can do fft simulation and get THD. And .vec file can be used too. But for snr, i don't kown how to simulate it.