Modulator circuit

Details Modulator circuit Modulator circuit

1996-04-12

1998-01-06

Chin, Stephen

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

375261, 332103, H04L 2736, H04L 2302

Patent

active

057063117

ABSTRACT:
The goal of this invention is to offer an orthogonal modulator circuit where carrier feedthrough of the direct modulation method does not occur and there are not the two output frequencies of the indirect modulation method. A signal with the first frequency (.omega..sub.c1) enters a first and a second modulator 30, 40 and becomes two reciprocal 90.degree. phase shifted, four phase modulated signals S.sub.1, S.sub.2 that enter a first and a second mixer circuit 51, 52; a signal with the second frequency (.omega..sub.c2) is multiplied with the two 90.degree. phase shifted signals, and the output of the first and second mixer are added together in a SSB modulator resulting in the output of a single frequency signal.

REFERENCES:
patent: 4816783 (1989-03-01), Leitch

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