AGC device for producing a gain controlled and d.c. offset remov

Details AGC device for producing a gain controlled and d.c. offset remov AGC device for producing a gain controlled and d.c. offset remov

1990-06-13

1992-02-04

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

455234, H04L 2706

Patent

active

050864378

ABSTRACT:
In an automatic gain control device which is connected to an output circuit (21, 22) supplied with a gain controlled signal to produce a timing signal in a receiver of a direct conversion type and which includes an amplifier (23, 24) for amplifying a received baseband signal into an amplified signal with a controllable gain, a d.c. blocking circuit (25, 26) for producing a variable level signal with the amplified signal exempted from a d.c. component, and a level detector (27, 28) for producing a level value signal by detecting level values of the variable level signal, a timing controller (31) is supplied with the timing signal to produce a first control signal in each of predetermined time slots in which a receiver input signal comprises bursts representative of an information signal. A second control signal is produced in an interval between two consecutive ones of the predetermined time slots. Controlled by the first control signal, a sample holding circuit (35, 36) supplies the level value signal to the amplifier to control the gain. Controlled by the second control signal, a clamping switch (33, 34) produces the gain controlled signal by removing a d.c. offset from the variable level signal. The receiver input signal may be orthogonally modulated.

REFERENCES:
patent: 3009058 (1961-11-01), Bodez
patent: 3733553 (1973-05-01), Magnante et al.

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