Re: [oc] SNR Calculation using CADENCE SpectreS tool

[mike_tepl@yahoo.com]

Hi,
Is somobody can help me? I have the same problem.
Thanxs.
Mike.

----- Original Message ----- 
From: gu2@u...  
To: cores@o...  
Date: Tue, 28 May 2002 00:29:27 +0200 
Subject: Re: [oc] SNR Calculation using CADENCE SpectreS tool 

> 
> 
> 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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