Variable gain amplifier circuit and semiconductor integrated circuit
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United States of America Patent
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Oct 15, 2024
Grant Date -
May 12, 2022
app pub date -
Nov 9, 2021
filing date -
Nov 11, 2020
priority date (Note) -
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Abstract
A variable gain amplifier circuit includes first and second input terminals, first and second output terminals, first and second transistors respectively having bases electrically connected to the first and second input terminals and having collectors electrically connected to the first and second output terminals, and a degeneration circuit connected between emitters of the first and second transistors. The degeneration circuit has first and second MOS transistors each having two current terminals connected in series between the emitters of the first and second transistors, series resistor circuits, first and second current sources, two resistive elements connected between the first and second current sources and gates of the first and second MOS transistors, and two resistive elements connected between the first and second current sources and two nodes of the series resistor circuits.
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