AGC circuit for double conversion digital television tuner

Details AGC circuit for double conversion digital television tuner AGC circuit for double conversion digital television tuner

1991-12-30

1993-12-14

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

4552481, 330284, 333109, H04N 550

Patent

active

052708241

ABSTRACT:
An AGC system for a double conversion type tuner for tuning digital television signals includes a quadrature coupler that has two of its four ports each terminated by a pin diode. The pin diodes are driven conductive in response to an AGC voltage and control the power transfer from the first mixer to the first IF amplifier. A series resistor is connected in circuit with each pin diode for providing a 50 ohm impedance when its associated pin diode is driven fully conductive. The pin diodes are conductively balanced to maintain impedance matching between the first mixer and the first IF amplifier.

REFERENCES:
patent: 4216445 (1980-08-01), Abajian
patent: 4559489 (1985-12-01), Vacanti et al.
patent: 4590613 (1986-05-01), Tannery
patent: 4673886 (1987-06-01), Bickley et al.

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