Automatic gain control circuit with input and output signal dete

Details Automatic gain control circuit with input and output signal dete Automatic gain control circuit with input and output signal dete

1995-11-06

1998-06-16

Vo, Nguyen

Telecommunications

Transmitter

With feedback of modulated output signal

455 69, H01Q 1112, H04B 104

Patent

active

057686947

ABSTRACT:
An AGC circuit used in radio transmitters for satellite communications and the like, which is intended to eliminate non-linearity compensators for detectors and reduce the radio transmitters in size and complexity. An RF input signal is amplified and output while passing through input splitting means, programmable attenuator, amplifier, and output splitting means. At the same time, a part of the RF input signal branches off at the input splitting means to input detecting means, where it is detected so as to obtain an input signal amplitude. In addition, a part of the amplifier output is split off at the output splitting means, then attenuated by attenuation means and finally reaches output detecting means, where the signal is detected so as to obtain an output signal amplitude after attenuation. Control means adjusts the attenuation factor of the programmable attenuator so that the input of the input detecting means will be equal to the input of the output detecting means. This structural arrangement allows both the input detecting means and output detecting means to work at the same operating point. Having well-matched detection characteristics for those two detecting means as well as the same operating point will eliminate non-linearity compensation.

REFERENCES:
patent: 3900823 (1975-08-01), Sokal et al.
patent: 5208550 (1993-05-01), Iwane
patent: 5265119 (1993-11-01), Gilhousen et al.
patent: 5313658 (1994-05-01), Nakamura
patent: 5471654 (1995-11-01), Okazaki et al.
patent: 5507016 (1996-04-01), Okuhara
patent: 5524285 (1996-06-01), Wray et al.
patent: 5574982 (1996-11-01), Almgren et al.

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