US Patent No. 10,658,984

DIFFERENTIAL AMPLIFIER CIRCUIT


Patent No. 10,658,984
Issue Date May 19, 2020
Title Differential Amplifier Circuit
Inventorship Yusuke Shimamune, Kyoto (JP)
Assignee MURATA MANUFACTURING CO., LTD., Kyoto (JP)

Claim of US Patent No. 10,658,984

1. A differential amplifier circuit comprising:a differential transistor pair including a first field-effect transistor and a second field-effect transistor;
a first current source configured to generate a current that flows through the first field-effect transistor and the second field-effect transistor; and
an output circuit configured to output an output voltage corresponding to a difference between a gate voltage of the first field-effect transistor and a gate voltage of the second field-effect transistor, in accordance with an operation of the differential transistor pair,
wherein a back gate of the first field-effect transistor is connected to a gate of the first field-effect transistor,
wherein a back gate of the second field-effect transistor is connected to a gate of the second field-effect transistor,
wherein a first feedback voltage corresponding to the output voltage is supplied to the gate of the second field-effect transistor, and
wherein the back gate of the first field-effect transistor is connected to the gate of the first field-effect transistor independently of the back gate of the second field-effect transistor being connected to the gate of the second field-effect transistor.