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simple track and hold (Read 437 times)

medya

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Posts: 14

simple track and hold
Jul 18^th, 2012, 2:55pm

hello,
i simulate this circuit in spectre with input freq=100k and sampling frequency of 100Msps ,taking fft from the output of switch(vi1-vi2) shows that the resolution is good but when change the input freq to 10M the output have low rwsulotion i reduce the rc time of circuit(switch close res=1mohm c=10f) but the result dont chnge what is the problem? Huh

thanks
Medya.

SWITCH.png

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Geoffrey_Coram Senior Fellow Offline Posts: 1998 Massachusetts, USA	Re: simple track and hold Reply #1 - Jul 19^th, 2012, 6:22am What does your tran analysis statement look like? Some simulators set the timestep based on a fraction of the full transient time, so if you didn't make the full transient shorter when you increased the frequency, you wouldn't get small enough time steps.
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