Direct frequency synthesizer

Details Direct frequency synthesizer Direct frequency synthesizer

1991-04-26

1992-11-24

Miller, Stanley D.

Boots, shoes, and leggings

364721, 307529, H03B 1900

Patent

active

051666294

ABSTRACT:
A direct frequency synthesizer is provided with a single stage or multiple cascaded stages. Each stage includes a fixed frequency input channel and a selectable frequency input channel which are coupled respectively to the I and L ports of a mixer. The input channel includes a divider having a divisor equal to N. The selectable frequencies range from f.sub.1 to f.sub.1 +j.theta.. Single-pole-multiple-throw switches selectively connect the fixed and selectable frequencies to the mixer to generate output frequency signals through an output filter bank. Specific relationships among N, n and .theta. are used to establish continuous output frequency coverage, stage cascadability and other synthesizer operating features.

REFERENCES:
patent: 4185247 (1980-01-01), Harrison, Jr.
patent: 4365201 (1982-12-01), Scott et al.
patent: 4558282 (1985-10-01), Lowenschuss
patent: 4725786 (1988-02-01), Papaieck
patent: 4878027 (1989-10-01), Carp et al.

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