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Sep 27th, 2021, 11:54am
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Noise Figure in switched cap, with Pnoise (Read 179 times)
sparky
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Noise Figure in switched cap, with Pnoise
Aug 13th, 2021, 3:28am
 
Hi, I am trying to get Noise Figure in track and hold circuit with RC>>Ts/2 as shown in added image.

NF= 10logF,  where F is Noise Factor
and F = (Ni+Nsys)/Ni.

In my circuit Nsys =0 (Sys include only switch and cap, there is no res(noise generator)). so, F should be =1, so the Noise figure should be = 0.
But, cadence giving me F = 1.96  and NF = 2.92.

Please help, what I am doing wrong.  I have added image of schematic and setiing of PSS and Pnoise
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switch_ckt.png
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sparky
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Re: Noise Figure in switched cap, with Pnoise
Reply #1 - Aug 13th, 2021, 3:30am
 
pss analysis setting
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pss_001.png
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sparky
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Re: Noise Figure in switched cap, with Pnoise
Reply #2 - Aug 13th, 2021, 3:32am
 
Pnoise
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pnoise1_001.png
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sparky
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Re: Noise Figure in switched cap, with Pnoise
Reply #3 - Aug 13th, 2021, 3:33am
 
pnoise2
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pnoise2.png
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Frank Wiedmann
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Re: Noise Figure in switched cap, with Pnoise
Reply #4 - Aug 16th, 2021, 4:12am
 
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