公开(公告)号：US20230353109A1

公开(公告)日：2023-11-02

申请号：US18345921

申请日：2023-06-30

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Jingjing Wang ,  Zhaohua Qian ,  Bingzhao Zhang ,  Chunbiao Wu ,  Jie Peng ,  Jiandong Ke

IPC: H03F3/45 ,  H03G1/00 ,  H03F1/32

CPC classification number: H03F3/45475 ,  H03F3/45224 ,  H03G1/0029 ,  H03F1/3211

Abstract: An operational amplifier, a drive circuit, an interface chip (1201, 1301, 1401, 1501), and an electronic device (1600) relate to the field of power electronics technologies. The operational amplifier includes a first load (R1), a second load (R2), a first switching transistor group (301-1), a second switching transistor group (301-2), and a tail current source (203). The first switching transistor group (301-1) has a first end connected to a first output end (outp) of the operational amplifier and connected to a power supply (VDD) of the operational amplifier by using the first load (R1), and has a second end grounded by using the tail current source (203). The second switching transistor group (301-2) has a first end connected to a second output end (outn) of the operational amplifier.

公开(公告)号：US11750198B2

公开(公告)日：2023-09-05

申请号：US17564595

申请日：2021-12-29

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Yanqin Chen ,  Chunbiao Wu ,  Yongwang Liu ,  Bingzhao Zhang

IPC: H03L7/02

CPC classification number: H03L7/02

Abstract: Embodiments of this application disclose an RC oscillator that amplifies a difference between a first voltage and a second voltage by using a first amplifier and a second amplifier. The first amplifier may include a first amplification circuit and a second amplification circuit. The first amplification circuit and the second amplification circuit may share a same voltage-current conversion circuit. The RC oscillator disclosed in the embodiments of this application not only avoids noise introduced by the first amplifier, but also reduces internal noise of the RC oscillator and a jitter of a clock signal.