Frequency hopping synthesizer using dual gate amplifiers

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synthesizer

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327113, 327114, 327116, 327119, 327355, 455332, 455333, H03B 2100, H03L 700

Patent

active

056614241

ABSTRACT:
A frequency hopping synthesizer is constructed from two FET-based multiplier circuits each responsive to a carrier input signal and a modulation signal to produce respective output signals which are in-phase combined to provide a frequency-shifted signal. The multiplier circuits each comprise two dual-gate field effect transistor (FET) amplifiers which are electrically balanced to suppress unmodulated carrier components so that only the modulated carrier signal appears. The respective carrier input signals and modulation signals are in quadrature phase relationship. A direct digital synthesizer controllably generates signal components which serve as the modulation signals for the multiplier circuits.

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patent: 4726039 (1988-02-01), Piesinger
patent: 4841169 (1989-06-01), Tsironis
patent: 5075632 (1991-12-01), Payne et al.
patent: 5140198 (1992-08-01), Atherly et al.
patent: 5184093 (1993-02-01), Itoh et al.

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