Linear receiver having dual automatic gain control loops

Details Linear receiver having dual automatic gain control loops Linear receiver having dual automatic gain control loops

1995-06-01

1998-02-24

Vo, Nguyen

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

4552501, 455311, H04B 116

Patent

active

057220620

ABSTRACT:
A linear receiver is disclosed which includes a linear receiver having: a preamplifier for amplifying linearly a modulated carrier signal (RF signal) having a first frequency trapped by an antenna; a mixer for converting the RF signal into an intermediate frequency signal having a second frequency less than the first frequency in accordance with a local oscillation signal; an IF stage for analogue delivering a demodulated output signal by saturatedly amplifying the intermediate frequency signal and for outputting an RSSI signal which indicates a level of the RF signal; an IF stage for digital incorporating therein an AGC input terminal for controlling an amplitude gain thereof for outputting an in-phase (I) signal and a quadrate (Q) signal, respectively, with the intermediate frequency signal by linearly amplifying the intermediate frequency signal; a first feed back loop circuit for providing a first feed back control signal to the AGC input terminal so as to keep demodulation levels of the I signal and the Q signal constant and not to be saturated; and a second feed back loop circuit for providing a second feed back control signal to the preamplifier and/or the mixer so as to keep the preamplifier and/or the mixer not to be saturated.

REFERENCES:
patent: 4186351 (1980-01-01), Brefini et al.
patent: 4435846 (1984-03-01), Weise
patent: 4541122 (1985-09-01), Kimura
patent: 4553105 (1985-11-01), Sasaki
patent: 5507023 (1996-04-01), Suganuma et al.
patent: 5513387 (1996-04-01), Saito et al.

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