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A sample hold circuit (Read 1726 times)
didibabawu
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A sample hold circuit
Jul 18th, 2007, 12:21am  
In the picture is a sample hold circuit of pipeline ADC. Maybe most people use only the left part. But I have seen from a famous company's schematic that they use an amplifier to control the common mode voltage of the SHA input.
So, I want to know why the feed back circuit was used?
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ywguo
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Shanghai, PRC
Re: A sample hold circuit
Reply #1 - Aug 9th, 2007, 2:14am  
Hi,

I guess it is to control the input common mode voltage. It is a cmfb for the input.

Where is port c connected to? Are the two amplifier (A) the same?


Yawei
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