Quadrature phase shift keying modulating apparatus

Modulators – Phase shift keying modulator or quadrature amplitude modulator

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Details

375281, 375308, H04L 2720

Patent

active

058476229

ABSTRACT:
A quadrature phase shift keying (QPSK) modulating apparatus includes a bit splitter for dividing a bipolar input bit stream into first and second data streams, first and second binary phase shift keying (BPSK) modulators, and a combiner for combining output signals of the first and second BPSK modulators to obtain a QPSK modulated output. The first BPSK modulator includes a voltage-controlled first electrical source which receives the first data stream, and a first oscillator which includes a first resonator that has a first resonant frequency and that is excited by the first electrical source in response to the first data stream so as to generate a first sine wave output. The second BPSK modulator includes a differentiator which receives the second data stream and which generates impulse signals corresponding thereto, a second electrical source, and a second oscillator which includes a second resonator that has a second resonant frequency equal to the first resonant frequency and that is excited by the second electrical source in response to the impulse signals so as to generate a second sine wave output which is 90.degree. out of phase relative to the first sine wave output when the first and second data streams are the same.

REFERENCES:
patent: 4940954 (1990-07-01), Aubert et al.

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