Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synthesizer
Patent
1993-01-27
1997-08-26
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synthesizer
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.
REFERENCES:
patent: 3475626 (1969-10-01), Holzman et al.
patent: 4159526 (1979-06-01), Mosley, Jr. et al.
patent: 4308473 (1981-12-01), Carnes
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.
Callahan Timothy P.
GTE Laboratories Incorporated
Le Dinh T.
Suchyta Leonard C.
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