Direct digital to analog microwave frequency signal simulator

Details Direct digital to analog microwave frequency signal simulator Direct digital to analog microwave frequency signal simulator

1995-06-07

1998-06-09

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

327113, 327119, 327116, 327107, 364721, H03B 2100

Patent

active

057640874

ABSTRACT:
A direct digital-to-analog microwave frequency signal synthesizer device which employs both wideband and narrowband direct digital frequency synthesizer (DDFS) circuitry to improve frequency and phase agility, reduce spurious performance, and minimize direct analog circuitry. A clock output having an extremely precise and highly stabilized frequency is fed to the wideband DDFS circuit and to the narrowband DDFS circuit. One or the other is selectively enabled by control logic circuitry. When the former is enabled, precision, high frequency resolution, low spurious, fast frequency switching is achieved at the microwave output. When the latter is enabled, precision, high frequency and phase resolution, low spurious, is achieved, providing frequency chirp, and frequency phase control at the microwave output. The output of the wideband DDFS circuit is processed to reduce the spurious response and up-converted, while the output of the narrow band DDFS circuit is directly up-converted. The selected DDFS circuit, is frequency up-converted to provide a synthesized microwave output signal.

REFERENCES:
patent: 3906388 (1975-09-01), Jones et al.
patent: 5436600 (1995-07-01), Van Heteren et al.
patent: 5495202 (1996-02-01), Hsu
patent: 5521533 (1996-05-01), Swanke

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