US 12,407,312 B2
Sample-and-hold amplifier
Lin Song, Hangzhou (CN); and Guangyang Qu, Hangzhou (CN)
Assigned to Silergy Semiconductor Technology (Hangzhou) LTD, Hangzhou (CN)
Filed by Silergy Semiconductor Technology (Hangzhou) LTD, Zhejiang (CN)
Filed on Dec. 13, 2022, as Appl. No. 18/080,027.
Claims priority of application No. 202111608815.4 (CN), filed on Dec. 23, 2021.
Prior Publication US 2023/0208372 A1, Jun. 29, 2023
Int. Cl. H03F 1/02 (2006.01); H03F 3/45 (2006.01)
CPC H03F 3/45753 (2013.01) [H03F 3/45273 (2013.01); H03F 3/45645 (2013.01); H03F 3/45475 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A sample-and-hold amplifier, comprising:
a) an operational amplifier comprising a switch module;
b) a sampling capacitor having a first terminal coupled to an inverting input terminal of the operational amplifier, and a second terminal coupled to a reference ground;
c) a switching circuit configured to switch feedback paths of the sample-and-hold amplifier in a first stage and a second stage, such that an offset voltage of the operational amplifier is at least partially eliminated; and
d) wherein an output terminal of the operational amplifier is respectively coupled via the switch module to different circuit nodes therein in the first stage and the second stage.