The Designer's Guide Community Forum

The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl
Design >> Analog Design >> A sample hold circuit
https://designers-guide.org/forum/YaBB.pl?num=1184743271

Message started by didibabawu on Jul 18^th, 2007, 12:21am

Title: A sample hold circuit
Post by didibabawu on Jul 18^th, 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?

Title: Re: A sample hold circuit
Post by ywguo on Aug 9^th, 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