US 11,942,963 B2
Follow-hold switch circuit
Daiguo Xu, Chongqing (CN); Dongbing Fu, Chongqing (CN); Zhengping Zhang, Chongqing (CN); Zhou Yu, Chongqing (CN); Jian'an Wang, Chongqing (CN); Can Zhu, Chongqing (CN); Ruzhang Li, Chongqing (CN); Guangbing Chen, Chongqing (CN); Yuxin Wang, Chongqing (CN); and Xueliang Xu, Chongqing (CN)
Assigned to NO. 24 RESEARCH INSTITUTE OF CHINA ELECTRONICS TECHNOLOGY GROUP CORPORATION, Chongqing (CN); and Chongqing GigaChip Technology Co., Ltd., Chongqing (CN)
Appl. No. 17/921,990
Filed by NO.24 RESEARCH INSTITUTE OF CHINA ELECTRONICS TECHNOLOGY GROUP CORPORATION, Chongqing (CN); and Chongqing GigaChip Technology Co., Ltd., Chongqing (CN)
PCT Filed Jan. 19, 2021, PCT No. PCT/CN2021/072719
§ 371(c)(1), (2) Date Oct. 28, 2022,
PCT Pub. No. WO2022/032987, PCT Pub. Date Feb. 17, 2022.
Claims priority of application No. 202010795061.7 (CN), filed on Aug. 10, 2020.
Prior Publication US 2023/0198537 A1, Jun. 22, 2023
Int. Cl. H03M 1/12 (2006.01); G11C 27/02 (2006.01); H03K 17/687 (2006.01)
CPC H03M 1/1245 (2013.01) [G11C 27/02 (2013.01); H03K 17/6871 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A follow-hold switch circuit, comprising:
a follower;
a sampling sub-circuit, for voltage sampling;
a bootstrap-control sub-circuit, which provides a bootstrap voltage to the sampling sub-circuit when the follow-hold switch circuit is in a following state; and
a sampling-switch-control sub-circuit, which provides a common-mode voltage to a bootstrap capacitor in the bootstrap-control sub-circuit when the follow-hold switch circuit is in a holding state;
wherein the follower is connected to an output of the sampling sub-circuit, the sampling sub-circuit is connected to the bootstrap-control sub-circuit and the sampling-switch-control sub-circuit via a sample switch, respectively;
wherein the follower comprises at least a first MOS transistor and a constant current source, a drain of the first MOS transistor is connected to a supply voltage, a gate of the first MOS transistor is connected to the sampling sub-circuit, and a source of the first MOS transistor is connected to a positive terminal of the constant current source; wherein a negative terminal of the constant current source is grounded.