Heterodyne stage having precise closed-loop control of the ampli

Details Heterodyne stage having precise closed-loop control of the ampli Heterodyne stage having precise closed-loop control of the ampli

1989-01-27

1990-05-22

Orsino, Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455317, 455318, 455319, 455323, 331109, 331183, H04B 126

Patent

active

049283146

ABSTRACT:
A heterodyne stage of a receiver which includes a conventional mixer circuit and local oscillator circuit further includes a differential amplifier circuit which measures the amplitude of the injection signal generated by the local oscillator circuit and controls it precisely to a desired reference level by adjusting the current bias supply to the local oscillator circuit within a banded range to ensure start-up of the local oscillator upon energization and to protect against loss of injection signal under all operating conditions. The differential amplifier circuit provides for a precise amplitude reference setting and sufficient closed-loop gain for controlling the amplitude of the injection signal with a minimum of error between the measured and reference values.

REFERENCES:
patent: 3764917 (1973-11-01), Rhee
patent: 4528698 (1985-07-01), Fraser
patent: 4609884 (1986-09-01), Kindinger et al.

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