Re: [oc] SNR Calculation using CADENCE SpectreS tool

[gu2@uwindsor.ca]

Hi,

You may first sample you datas from your modulator output 
using 'sample' function and save them, then you can calculate SNR with 
MATLAB.

Hope this helps
gu
----- Original Message ----- 
From: adesh_b@a...  
To: cores@o...  
Date: Wed, 20 Feb 2002 21:27:53 +0100 
Subject: Re: [oc] SNR Calculation using CADENCE SpectreS tool 

> 
> 
> did u find a way to determine the snr of a signal using matlab 
> tools whether using the commands or in simulink. 
> If so please provide me with help. 
> send reply to: 
> 
> adesh_b@a...  
> 
> thank u! 
> 
> ----- Original Message ----- 
> From: electronicszone@y... 
> To: cores@o... 
> Date: Fri, 3 Aug 2001 16:19:18 +0200 
> Subject: [oc] SNR Calculation using CADENCE SpectreS tool 
> 
> > 
> > 
> > Dear Sir, 
> >                        I am  working on a Sigma-delta ADC. 
> >             Currently I am  working on CADENCE spectreS tool 
> to 
> > simulate the modulator. 
> >                                                            I 
> have a 
> > second order modulator . The bandwidth of the input is 
> 12.5MHz. The 
> > oversampling ratio is only four (so sampling freq. is 100MHz). 
> I am 
> > working on a cascaded (MASH) modulator in which the second 
> stage is 
> > a 10-bit Pipelined ADC. The flash ADC inside the modulator is 
> a 
> > 4-bit one. Currently, I have designed the 2nd order modulator 
> using 
> > Switched capacitor filters.  Now, I want to calculate the 
> Signal to 
> > Noise ratio at the output of the Modulator.  Can you please 
> help me 
> > how to calculate SNR using CADENCE? Since, I have just started 
> > working on CADENCE, i don't know much the features of this 
> tool. 
> > 				While doing its behavioral 
simulation in  MATLAB, i used 
> the 
> > PSD command in the MATLAB and since I know the input signal 
> > frequency, I calculated the signal power and the rest as the 
> Noise 
> > power to get the SNR. I thought to use that SNR routine only 
> (as i 
> > used in MATLAB) to calculate the SNR of the output of the 
> modulator 
> > generated in CADENCE spectreS tool. But the problem is that 
> this 
> > tool, during its transient analysis, does not generate samples 
> at 
> > regular interval. So, i cant use the PSD command available in 
> > MATLAB to calculate the PSD of the output of the modulator to 
> > calculate the SNR. 
> > 		Sir, please give me a suitable solution for the same. 
> > waiting for a positive reply. 
> >                                    Thanking You 
> > Yours sincerely 
> > Lokesh Kumath 
> > 
> 
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