Quadrature modulation circuit

Details Quadrature modulation circuit Quadrature modulation circuit

1992-10-30

1994-06-07

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

332117, 332103, H04L 2704

Patent

active

053196759

ABSTRACT:
A quadrature modulation circuit incorporated in a radio communication apparatus and selectively implementing transmission and reception in an analog mode or in a digital mode with a single circuitry. A VCO (Voltage Controlled Oscillator) or a frequency synthesizer including a VCO has an analog modulation capability and replaces a local oscillator included in a conventional modulator circuit for feeding an output thereof to a digital modulator.

REFERENCES:
patent: 4691318 (1987-09-01), Entenman
patent: 4881049 (1989-11-01), Yagi
patent: 4930141 (1990-05-01), Ohmagari
patent: 4972440 (1990-11-01), Ernst et al.
patent: 4990867 (1991-02-01), Ogura et al.

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