Automatic gain control circuit in a radio telephone receiver

Details Automatic gain control circuit in a radio telephone receiver Automatic gain control circuit in a radio telephone receiver

1990-10-05

1993-08-03

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 39, 4552341, 330124R, H04L 2708

Patent

active

052336344

ABSTRACT:
An automatic gain control circuit (AGC) in a receiver for a digital radio telephone. Most of the total gain control of the received signal is accomplished in the base band frequency sections, i.e. in the I and Q branches, where the signal amplification is controlled step by step, and only a minor part of the total gain control is performed in the RF stage. High amplification steps are formed with amplifiers (9a, 10a, 11a, 12a; 9b, 10b, 11b, 12b), wherein the desired amplifier is activated with a digitally controlled (A, B) multiplexer (13a, 13b), and low amplification steps are formed with a resistance attenuator (14a, 14b), in which a signal of desired level is selected by a digitally controlled (C, D, E) multiplexer (15a, 15b). In addition, the RF amplifier (2) has two amplification levels and the desired amplification is selected with a digital control (F). With the different digital control combinations (A, B, C, D, E, F) the entire gain control range required of the receiver can be covered.

REFERENCES:
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patent: 3699325 (1972-10-01), Montgomery, Jr. et al.
patent: 4385400 (1983-05-01), Malchow
patent: 4468493 (1984-08-01), Johnson et al.
patent: 4476585 (1984-10-01), Reed
patent: 4574246 (1986-03-01), Yoshida
patent: 4633484 (1986-12-01), Takeda et al.
patent: 4774474 (1988-09-01), Beauducel et al.
patent: 4792991 (1988-12-01), Eness
patent: 5086437 (1992-03-01), Tomita

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