US 12,381,526 B2
Amplifier circuit and sensor circuit
Akira Yamauchi, Yokohama Kanagawa (JP); and Hiroshi Yoshino, Yokohama Kanagawa (JP)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (JP); and Toshiba Electronic Devices & Storage Corporation, Tokyo (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION, Tokyo (JP)
Filed on Sep. 6, 2022, as Appl. No. 17/930,061.
Claims priority of application No. 2022-048355 (JP), filed on Mar. 24, 2022.
Prior Publication US 2023/0318550 A1, Oct. 5, 2023
Int. Cl. H03F 3/45 (2006.01); G01R 1/30 (2006.01); G01R 33/07 (2006.01); H03F 3/00 (2006.01)
CPC H03F 3/45076 (2013.01) [G01R 1/30 (2013.01); G01R 33/07 (2013.01); H03F 3/005 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An amplifier circuit comprising:
a first capacitive element;
a first GM amplifier that includes a first input node, a second input node, and an output node, the output node being connected to one end of the first capacitive element;
a second GM amplifier that includes a first input node, a second input node, and an output node, the output node being connected to the one end of the first capacitive element;
a switch that has one end connected to the output node of the second GM amplifier, and the other end connected to the second input node of the second GM amplifier;
a second capacitive element that has one end connected to the first input node of the second GM amplifier, and the other end connected to the second input node of the second GM amplifier;
a first selector circuit that switches between a first state and a second state, the first state being a state where a first input terminal and the first input node of the first GM amplifier are connected, the second state being a state where first reference voltage and the first input node of the first GM amplifier are connected; and
a second selector circuit that switches between a third state and a fourth state, the third state being a state where a second input terminal and the second input node of the first GM amplifier are connected, the fourth state being a state where the first reference voltage and the second input node of the first GM amplifier are connected,
wherein the first reference voltage is connected to the first input node of the second GM amplifier.