公开(公告)号：US20240176378A1

公开(公告)日：2024-05-30

申请号：US18518770

申请日：2023-11-24

申请人： LX SEMICON CO., LTD.

发明人： Harim CHOI ,  Kyung Min SHIN ,  Yongsung AHN

IPC分类号： G05F3/20 ,  G05F1/46

CPC分类号： G05F3/20 ,  G05F1/468

摘要： Proposed is a band gap reference circuit under a low supply voltage capable of generating a band gap reference voltage even under a low supply voltage by using a plurality of bias voltages separately generated and a current source using these bias voltages without using a diode connected structure used in the related art while not being affected by limitations in the operating voltage of a bipolar transistor. The band gap reference circuit under a low supply voltage includes a voltage reference main circuit configured to generate a first node voltage and a second node voltage in response to a first bias voltage and a band gap reference voltage, and a transimpedance amplifier configured to generate the band gap reference voltage by amplifying a difference between the first node voltage and the second node voltage using the first bias voltage, a second bias voltage, and a third bias voltage.

公开(公告)号：US20240178808A1

公开(公告)日：2024-05-30

申请号：US18518836

申请日：2023-11-24

申请人： LX SEMICON CO., LTD.

发明人： Harim CHOI ,  Jiwon KIM ,  Hyo Joong KIM ,  Kyung Min SHIN ,  Yongsung AHN

IPC分类号： H03F3/45

CPC分类号： H03F3/45475 ,  H03F2200/129 ,  H03F2200/375

摘要： The present invention provides an offset free differential amplifier and an offset free method of a differential amplifier capable of removing an offset of a differential amplifier by selectively using at least one of an auto zero method and a chopping method. The offset free differential amplifier includes a differential amplifier; a chopping switch unit that is connected to two input terminals and one output terminal of the differential amplifier in response to a chopping control signal and removes an average offset of the differential amplifier; and an auto-zero switch unit that is connected to the differential amplifier and the chopping switch unit in response to an auto-zero switch control signal and removes an absolute offset of the differential amplifier.