RF digital phase shift modulators

Details RF digital phase shift modulators RF digital phase shift modulators

1991-10-25

1992-09-15

Pascal, Robert J.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

375 67, H04L 2700

Patent

active

051481286

ABSTRACT:
A BPSK (Binary-Phase-Shift-Keying) modulator having reduced amplitude and phase errors includes two non-ideal N.degree.-bit phase shifters disposed between two 3 dB quadrature couplers to perform out-of-phase combining. When the two phase bits are alternately switched between a reference state and a signal state being N.degree. out of phase with respect to the reference by the cancellation, a 180.degree. binary phase shift keying modulator having reduced amplitude and phase errors relative to the individual phase shifters is provided.

REFERENCES:
patent: 3371284 (1968-02-01), Engelbrecht
patent: 3973201 (1976-08-01), Andren
patent: 4021758 (1977-05-01), Standing
patent: 4583061 (1986-04-01), O'Shea
patent: 4843352 (1989-06-01), Kamisaka et al.
patent: 5081433 (1992-01-01), Erickson et al.

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