公开(公告)号：US20220368297A1

公开(公告)日：2022-11-17

申请号：US17691428

申请日：2022-03-10

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： JUNGMOON KIM ,  TAEKSU KWON ,  YUNSEOK JANG ,  KEUNHWA PARK

IPC: H03F3/45

Abstract: An operational amplifier compensation circuit includes; a first transistor activated/deactivated in response to a signal level difference between an input signal applied to an operational amplifier and an output signal provided by the operational amplifier, a first signal amplifying circuit including a second transistor and a first load, wherein the first signal amplifying circuit is configured to generate a first gate voltage amplified in response to the voltage level difference between the input signal and the output signal in relation to an internal resistance of the second transistor and a resistance of the first load when the first transistor is activated, and a third transistor configured to generate a first compensation current in response to the amplified first gate voltage and provide the first compensation current to the operational amplifier.

公开(公告)号：US20210366344A1

公开(公告)日：2021-11-25

申请号：US17090720

申请日：2020-11-05

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： KYUNGHOON CHUNG ,  JAESUNG KANG ,  JIHYUN LEE ,  JEONGWOO LIM ,  YUNSEOK JANG ,  JAEWON CHOI

IPC: G09G3/20 ,  H03F3/45

Abstract: An operational amplifier includes an input stage with a first main input unit, a first auxiliary input unit, a second main input unit and a second auxiliary input unit, an amplification stage with a first current mirror receiving currents from the first main input unit and the first auxiliary input unit, and a second current mirror receiving currents from the second main input unit and the second auxiliary input unit, an output stage receiving voltages from the first current mirror and the second current mirror, a voltage storage unit storing an intermediate voltage based on an output signal generated by the output stage during at least one of a first operation period and a second operation period, and a switching unit that differently controls a first feedback path between the output stage and the input stage and a second feedback path between the output stage to the voltage storage unit in accordance with the first operation period and the second operation period.