LOW DISTORTION AND LOW NOISE AGC DRIVER AMPLIFIER

摘要

PROBLEM TO BE SOLVED: To provide a low distortion and low noise AGC driver amplifier for simultaneously suppressing the deterioration of an NF and an ACP by an ATT. ;SOLUTION: All AGC driver amplifier is provided with an initial stage FET 10 for amplifying an RF signal, a rear-stage amplifier 12 for amplifying the controlled RF signal, and a switch type ATT 14 inserted between the amplifiers 10 and 12. The inputted RF signal is amplified by the amplifier 10. The amplifier signal is inputted to an SW type ATT 14 having a shunt type FET 16 and a series type FET 18 for attenuating a signal by changing an AGC voltage. A signal which is power-controlled and outputted by the SW type ATT 14 is inputted to the amplifier 12, and amplified, and finally outputted.;COPYRIGHT: (C)2001,JPO