Amplifier circuit having common AGC to IF and RF amplifiers for

Details Amplifier circuit having common AGC to IF and RF amplifiers for Amplifier circuit having common AGC to IF and RF amplifiers for

1997-03-12

1999-07-20

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

Power control, power supply, or bias voltage supply

4552341, 4552451, H04B 106

Patent

active

059267496

ABSTRACT:
An amplifier circuit comprises current-variable mode variable amplifying circuits and for amplifying an IF signal and a current-constant mode variable amplifying circuit for amplifying an RF signal. I and Q signals are applied to the IF-stage variable amplifying circuits and corresponding to two stages through a QPSK modulating circuit and amplified based on an AGC voltage VAGC applied thereto. The IF signal is converted into the RF signal by a mixer, which in turn is applied to the RF-stage variable amplifying circuit where it is amplified based on the AGC voltage VAGC common to the IF stages. The linearly-varied AGC voltage VAGC is converted into an exponentially-varied control current by transistors. Thus, a gain with the AGC voltage VAGC.

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Tietze, U.: Schenk, Ch.: Halbleiter-Schaltunagstech-nik, Berlin (and others), Springer, 1983, pp. 476-478.

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