Modulator

Details Modulator Modulator

1993-03-19

1996-07-09

Dolinar, Andrew M.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

332151, 332149, H03C 100, H03C 300

Patent

active

055348270

ABSTRACT:
In an amplitude modulator, a delta sigma modulator converts a digital or analog modulation signal into a binary signal. The binary signal and a carrier signal are sent to a multiplication circuit. The phase of the carrier signal is changed to normal phase or opposite phase. The resultant carrier signal is output as an amplitude modulation wave. An orthogonal modulator sends a local oscillation signal to a phase shifter. The phase shifter outputs two carrier signals with phases which differ by 90.degree. each other. The modulation signal and carrier signals are sent to the amplitude modulator. The amplitude modulator outputs an amplitude modulation signal. These signals are sent to an analog signal composing unit. The analog signal composing unit composes the input signals and outputs an amplitude and phase modulation signal.

REFERENCES:
patent: 3466460 (1969-09-01), Connolly
patent: 3896395 (1975-07-01), Cox
patent: 4319359 (1982-03-01), Wolf
patent: 4320361 (1982-03-01), Kikkert
patent: 4467291 (1984-08-01), Roza
"A Precise Digital Modulated Signal Generator", Masahiro Kuroda, The 1991 Autumn Convention Thesis B-239 of The Institute of Electronics, Information, and Communication Engineers, (1991). (month unknown).
H. Inose, Y. Yasuda, J. Murakami, "A Telemetering System by Code Manipulation--.DELTA.-.SIGMA. Modulation," IRE Trans on Space Electronics and Telemetry, Sep. 1962, pp. 204-209.
R. Schreier, "An Empirical Study of High-Order Single Bit Delta-Sigma Modulators," IEEE Trans. on CAS., vol. 40, No. 8, Aug. 1993.
S. Jantzi, W. Snelgrove, P. Ferguson, Jr., "A Fourth-Order Bandpass Sigma-Delta Modulator," IEEE Journal of Solid-State Circuits, vol. 28, No. 3 Mar. 1993.

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