Quadrature modulator having controlled phase shifter

Details Quadrature modulator having controlled phase shifter Quadrature modulator having controlled phase shifter

1993-05-20

1995-02-07

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

332167, 375 39, 375 43, 375 61, H03C 152, H04L 2736

Patent

active

053878833

ABSTRACT:
A quadrature modulation circuit of the present invention has a phase shifter whose shifting amount is fixed at 90 degrees, a minute amount-phase shifter whose shifting amount is variable, a detector for detecting a RF signal supplied from the quadrature modulation circuit by a direct voltage signal, and a control circuit for generating a control signal in accordance with a direct voltage signal from the detector. Phase shifting amount of the minute amount-phase shifter is adjusted by the control signal whereby a total amount of the phase shifting is maintained at 90 degrees.

REFERENCES:
patent: 4216542 (1980-08-01), Hermesmeyer
patent: 4574244 (1986-03-01), Head

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