NASA NTRS · 19790000320
All-digital QPSK modulator
Abstract
Circuit consisting to only four components (2 IC chips and 2 time delay devices) modulates RF signal with 2 asynchronous digital data signals. Digital modulator is virtually free of amplitude modulation, is not subject to temperature effects from other components, dissipates less power, and is far simpler than its analog predecessors.
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Burgess, R. W., Julian, R. L.. 1980-04-01. All-digital QPSK modulator. https://ntrs.nasa.gov/citations/19790000320
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