Controlled gain amplifiers

Details Controlled gain amplifiers Controlled gain amplifiers

H - Electricity

03

F

330/35

H03F 1/34 (2006.01) H03G 1/00 (2006.01)

Patent

CA 1187567

ABSTRACT IMPROVEMENTS IN OR RELATING TO CONTROLLED GAIN AMPLIFIERS Amplifier gain is varied in response to a control voltage Vc by a switched capacitor variable transconductance feedback network, First and second capacitors 24, 26 are connected in series between the input and output of an operational amplifier and are switched by a first toggle switch 28 and a second toggle switch 30. Both toggle switches are operated by a pair of non-overlapping pulse trains 01, 02. A voltage- controlled variable resistance network 42 is connected between the common node 40 of the capacitors and ground whereby the resistance between node 40 and ground is dependent on the control voltage Vc.

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