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From: bhargav_neha at yahoo.com<bhargav_neha@y...>
Date: Fri Mar 26 11:25:40 CET 2004
Subject: [oc] SNR Calculation using CADENCE SpectreS tool
Hi,
I need some help to write matlab code for calculating SNR of an adc.I
am using coherent sampling i.e. integral no. of input signal periods.I
perform an fft on the data samples.Please tell me how many bins we
have to consider to extract signal component.Also how do we extract
harmonic power from this.

Thanks in advance
Neha

----- Original Message -----
From: stevepkwong@h...
To: cores@o...
Date: Sat, 27 Sep 2003 06:20:10 +0200
Subject: Re: [oc] SNR Calculation using CADENCE SpectreS tool

>
>
>
>
> ----- Original Message -----
> From: ghittori@e...
> To: cores@o...
> Date: Mon, 30 Jun 2003 11:24:07 -0100
> Subject: Re: [oc] SNR Calculation using CADENCE SpectreS tool
>
> >
> >
> > Hi,
> >
> > have you got an example of Matlab routine for the SNR
> calculation?
> > I',
> > not able to find a general way to extract the signal component
> from
> > my
> > frame of data (the signal is always located in more frequency
> bins)
> >
> > Thank you for yor help,
> >
> > Nicola
> >
> >
> >
> > ----- 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 > > > > > > > > > > > > > > >