Patent ID: 7501891

Claim:
A variable gain amplifier having a signal amplifying transistor and gain control transistors at an output side and a non-output side, whose emitters are connected to a collector of said signal amplifying transistor, said amplifier comprising: a non-output load provided between a collector of said gain control transistor at the non-output side and a power source, and equal to an output load which is connected between a collector of said gain control transistor at the output side and said power source; a non-output side negative feedback path provided between the collector of said gain control transistor at the non-output side and an input terminal of said signal amplifying transistor, and formed in a same circuit form with a same circuit constant as those of a negative feedback path which runs from an output terminal of said gain control transistor at the output side to said input terminal; and a current dividing circuit which divides biasing currents between said negative feedback path and said non-output side negative feedback path to cause the biasing currents to flow to said paths at a same ratio as a current division ratio between said gain control transistor at the output side and said gain control transistor at the non-output side.