Modulators – Phase shift keying modulator or quadrature amplitude modulator
Patent
1993-04-14
1995-09-12
Dolinar, Andrew M.
Modulators
Phase shift keying modulator or quadrature amplitude modulator
332167, 332170, H03C 154, H03C 160, H03C 340
Patent
active
054500443
ABSTRACT:
The invention provides various embodiments of a balanced modulator, each of which involves one or more individual amplitude modulators which, individually, do not provide suppressed-carrier outputs. A first embodiment employs a single amplitude modulator whose carrier input is selectively delayed by a half wavelength, depending on the polarity of the input modulating signal, and whose amplitude input receives the absolute value of the modulating input signal. A second embodiment involves summation of the outputs of two amplitude modulators whose carrier inputs are responsive to carrier signals offset by a half carrier wavelength and whose modulating signal inputs are responsive only to signals of respectively opposite polarity. Further, quadrature amplitude modulation (QAM) modulators are provided by a combination of the above-described modulators. Moreover, another embodiment of the QAM modulator involves use of an amplitude modulator operating on polar coordinate representations of the input modulating signal. The invention is useful in single sideband modulation, up-conversion, down-conversion, synchronous detection, product detection, and the like.
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Acrodyne Industries, Inc.
Dolinar Andrew M.
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