Heterodyne stage having precise closed-loop control of the...

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

H - Electricity

04

B

325/110

H04B 1/16 (2006.01) H03D 7/00 (2006.01) H03B 5/12 (2006.01) H03B 5/36 (2006.01) H03D 7/12 (2006.01)

Patent

CA 2004236

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.

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