Microwave frequency synthesizer with ultra-fast frequency settli

Details Microwave frequency synthesizer with ultra-fast frequency settli Microwave frequency synthesizer with ultra-fast frequency settli

1996-09-25

1998-06-23

Mis, David

Oscillators

Beat frequency

Frequency or amplitude adjustment or control

331 43, 331 77, 331179, 327105, H03B 1900

Patent

active

057709777

ABSTRACT:
The ability to achieve ultra-fast frequency settling times with good frequency resolution and high absolute accuracy over significant bandwidth at microwave frequencies ranging over three octaves. The implementation is an open-loop system requiring little or no compensation of temperature. This is accomplished by providing a frequency doubled direct digital synthesizer output to up/down convert a microwave frequency source. A special tracking filter architecture coupled to the microwave source provides the suppression of unwanted products. Fixed frequency set-on and swept bandwidths in excess of 300 MHz have been demonstrated. This is accomplished by using a direct digitally synthesized quadrature phased carrier which can be set to any frequency within a 350 MHz bandwidth to coherently up/down convert a low phase-noise microwave frequency to the sum or the difference frequency product. Individual control of differential phase and amplitude over frequency assures very high suppression of unwanted products without the use of additional filtering.

REFERENCES:
patent: 4882549 (1989-11-01), Galani et al.
patent: 5146186 (1992-09-01), Vella
patent: 5321401 (1994-06-01), White
patent: 5343168 (1994-08-01), Guthrie
patent: 5471661 (1995-11-01), Atkinson
patent: 5508661 (1996-04-01), Keane et al.

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