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[Moved]: Spectrum Analysis of sinusoidal signal

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salam_mnr

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I am using Cadence virtuoso 6.1.5 with HSPICE simulator. I am required to measure the ENOB (Effective Number Of Bits) at the input and output of some Analog Circuits, using Spectral Analysis. When measured for an ideal sinusoidal source (from analogLib) with simple resistive load, I was getting only less than 8. Can someone help me in doing the proper settings of the tool, so that the ENOB for the ideal source may be high (expected to be above 30)
 

Re: Spectrum Analysis of sinusoidal signal

Hi,

you only talk about analog circuits. But ENOB and "bits" is for digital systems.
With analog signals one doesn´t talk about ENOB, but about SNR.

For ENOB you need an ADC or something...

Do you have a signal flow chart.. to show us?

Klaus
 

Re: Spectrum Analysis of sinusoidal signal

My full circuit to be designed is a pipeline ADC with 10 bits resolution. It is accepting a single ended input from ideal sinusoidal source, followed by a single_ended-to-differential converter, which is fed to ADC. I am required to measure the ENOB at the output of ADC, at the output of single-to-differential converter and at the input (ideal sinusoidal source). I wanted to know the equivalent ENOB of the ideal source, which is used to feed the entire circuit. So I tested it alone with a resistive load. But it shows only 7.71. Is there any special settings required to do the analysis ? Please help me..

Regards,

Salam_mnr
 

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