Biphase modulaton circuit having continuous phase changes

Details Biphase modulaton circuit having continuous phase changes Biphase modulaton circuit having continuous phase changes

1990-09-28

1991-09-17

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

375 55, 375 67, H04L 2720

Patent

active

050498398

ABSTRACT:
A BPSK modulation circuit for a digital communication transmitter comprising a data generator for generating data, a timing circuit for delaying the data produced from the data generator by timing the data in synchronism with a given pulse, a logic circuit for generating a timing pulse whenever the data from the data generator is inverted, a local oscillator for generating a local oscillating frequency, a phase shifter for shifting the local oscillating frequency to have a phase difference of 90.degree., a first double balanced mixer for modulating the delayed signal of the timing circuit in synchronism with the 90.degree. phase-shifted signal of the phase shifter, a second double balanced mixer for modulating the timing pulse of the logic circuit in synchronism with the local oscillating frequency of the local oscillator, and a signal mixer (synthesizing circuit) for synthesizing the output signals of the first and second balanced mixers.

REFERENCES:
patent: 3973201 (1976-08-01), Andren

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