Switched capacitor feedback sample-and-hold circuit

Details Switched capacitor feedback sample-and-hold circuit Switched capacitor feedback sample-and-hold circuit

G - Physics

11

C

328/171

G11C 27/02 (2006.01)

Patent

CA 1207036

-11- ABSTRACT IMPROVEMENTS IN OR RELATING TO SAMPLE-AND-HOLD CIRCUITS AND METHODS. A feedback sample and hold circuit has an amplifier whose output is connected through a sampling switch (SS) to the input of a buffer (B). A holding capacitor (CH) is connected between input of the buffer (B) and ground potential. A correction coupling capacitor (CCC) and a correction holding capacitor (CCH) are connected between the input of the buffer (B) and ground, A correction switch SC is connected between the amplifier output (14 and the common node (22) of the correction capacitors (CCC, CCH). When the sampling switch (SS) opens for the hold condition, the correction switch (SC) briefly remains closed to permit the amplifier (A) to correct the hold voltage for switching charge feedthrough error from the sampling switch (SS) by charging the correction holding capacitor (CCH). The correction coupling capacitor (CCC) couples this correction in attenuated form to the holding capacitor (CH).

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