Patent ID: 11936352
Assignee: APPLE INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An amplifier circuit comprising:
a plurality of transistors including a first subset of transistors and a second subset of transistors, each transistor of the plurality of transistors configured to receive an input signal and output an amplified signal;
a plurality of input chopper circuits, an input chopper circuit of the plurality of input chopper circuits controlled by a control signal from a plurality of control signals, the input chopper circuit coupled to a transistor pair including a first transistor from the first subset of transistors and a second transistor from the second subset of transistors, the input chopper circuit configured to selectively connect each transistor of the transistor pair to a first input terminal of the amplifier circuit or a second input terminal of the amplifier circuit based on a value of the control signal, the control signal being based on threshold voltages of the transistor pair; and
a plurality of output chopper circuits, an output chopper circuit of the plurality of output chopper circuits corresponding to the input chopper circuit, the output chopper circuit controlled by the control signal, the output chopper circuit configured to selectively connect a drain terminal of each transistor of the transistor pair directly to a first output voltage terminal of the amplifier circuit or directly to a second output voltage terminal of the amplifier circuit based on the value of the control signal, the first and second output voltage terminals of the amplifier circuit forming a differential voltage output of the amplifier circuit, the first and second input terminals connected to the first and second output voltage terminals via the input chopper circuit, the transistor pair, and the output chopper circuit based on the control signal.