The Designer's Guide Community Forum https://designers-guide.org/forum/YaBB.pl Simulators >> Circuit Simulators >> simple track and hold https://designers-guide.org/forum/YaBB.pl?num=1342648564 Message started by medya on Jul 18th, 2012, 2:55pm

Title: simple track and hold Post by medya on Jul 18th, 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? :-? thanks Medya.

Title: Re: simple track and hold Post by Geoffrey_Coram on Jul 19th, 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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