VARIABLE GAIN AMPLIFIER AND VECTOR-SUM PHASE SHIFTER

摘要

This invention is configured so as to adjust the total gain of a variable gain amplifier by: controlling, according to either a first control pattern or a second control pattern, each of a plurality of main amplifiers each comprising a first source-grounded differential pair and a second source-grounded differential pair, the operation state of each of which can be switched between on and off; and, as regards a first sub-amplifier comprising a third source-grounded differential pair the operation state of which can be switched between on and off, controlling the operation state of the third source-grounded differential pair to be either on or off.