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From: andrew at openfuel.com<andrew@o...>
Date: Mon Jun 28 12:25:21 CEST 2004
Subject: [oc] SNR Calculation using CADENCE SpectreS tool
Hi

An useful site to help with this is http://www.maxim-
ic.com/appnotes.cfm/appnote_number/729 . Look down the page for
Matlab code. If you look you will find how many bins they used to get
the signal and harmonic power.

Hope this helps
Andrew

----- Original Message -----
From: bhargav_neha@y...<bhargav_neha@y...>
To:
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 > > > > > > > > > > > > > > > > >