公开(公告)号：US10707844B2

公开(公告)日：2020-07-07

申请号：US16312345

申请日：2017-06-21

Applicant: CSMC TECHNOLOGIES FAB2 CO., LTD.

Inventor： Xueyan Wang ,  Qiang Chen

IPC: H03K3/03 ,  H03K5/134 ,  H03B5/20 ,  H03L7/099

Abstract: A ring voltage control oscillator includes: a conversion unit (100), cascaded multistage delay units (200) and cascaded multistage isolation buffer units (300). The conversion unit (100) receives a voltage signal controlled by the external, converts the voltage signal into a current signal and respectively transmits the current signal to a plurality of delay units (200) and a plurality of isolation buffer units (300). The delay unit (200) comprises two signal input terminals and two signal output terminals; the isolation buffer unit (300) comprises two signal input terminals and two signal output terminals; a first signal input terminal and a second signal input terminal of the isolation buffer unit (300) are correspondingly connected to a first signal output terminal and a second signal output terminal of the same stage of the delay unit (200), respectively; clock signals outputted by first signal output terminals of two adjacent stages of the isolation buffering units (300) have the same phase difference; clock signals outputted by the second signal output terminals of two adjacent stages of the isolation buffering units (300) have the same phase difference.

公开(公告)号：US10079577B2

公开(公告)日：2018-09-18

申请号：US15565191

申请日：2016-01-29

Applicant: CSMC TECHNOLOGIES FAB2 CO., LTD.

Inventor： Xueyan Wang ,  Weiyan Zhang ,  Qiang Chen

IPC: H03F3/45 ,  H03F1/26

CPC classification number: H03F1/26 ,  H03F3/387 ,  H03F3/45475 ,  H03F2200/165 ,  H03F2203/45514 ,  H03F2203/45551

Abstract: A signal amplification circuit comprises a low pass filter circuit (100). The low pass filter circuit (100) comprises two input ends and two output ends and further comprises two capacitors (C1, C2) having opposite polarities respectively connected between two output ends. A buffer circuit (200) comprises two input ends, a first operational amplifier (A1) and a second operational amplifier (A2), two output ends and a plurality of switches. A switched capacitor integrated circuit (300) comprises two input ends, a third operational amplifier (A3), a plurality of capacitor modules, a plurality of chopper modulators and two output ends. A signal switch (S) is used to control the on and off states of voltage signal before amplification.