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A sample hold circuit

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didibabawu

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pic sample hold

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?
 

sec

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maybe I am totally wrong, but it seems to me look like a switched capacitor filter ... just saying that, maybe it will help
 

didibabawu

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There is something missing in the previous picture, I have changed the new one.
 

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waxtomato

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I find some of this kind of circuit in S/H with CDS& AMP for readout diff signal (MIcron imager)
 

didibabawu

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waxtomato said:
I find some of this kind of circuit in S/H with CDS& AMP for readout diff signal (MIcron imager)

Do you know why using the amp in the right?
 

panditabupesh

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Hello
That famous company has a patent and a jssc paper, I think Nov 1996, on it- I suggest going through them.

Bupesh
 

zouyufeng

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common feed back : 1)continuous
2)discrete

picture you give is 1)
 

panditabupesh

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Sorry I gave the wrong reference, memory plays tricks some times, the actual reference is:

A single-ended 12-bit 20 Msample/s self-calibrating pipeline A/D converter
Opris, I.E.; Lewicki, L.D.; Wong, B.C.;
Solid-State Circuits, IEEE Journal of
Volume 33, Issue 12, Dec. 1998 Page(s):1898 - 1903

Hope it helps

Bupesh
 

    didibabawu

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