Direct frequency synthesizer

Details Direct frequency synthesizer Direct frequency synthesizer

1987-10-20

1988-12-13

Miller, Stanley D.

Oscillators

Relaxation oscillators

331 40, 328 27, 455314, H03B 2102, H03B 1900

Patent

active

047913770

ABSTRACT:
A frequency synthesizer has in series a digital synthesizer, mix and divide circuits, and a mix only circuit. Each mix and divide circuit includes a mixer having an IF input, a LO input and a RF output, a filter, and a frequency divider. A segment of a digital word selects a tone from a tone generator and also selects a passband of the filter. The selected tone is coupled to the LO input of the mixer. The frequency divider divides the filtered RF output of the mixer. The mix only circuit is at the output of the last of the series connected mix and divide circuits. The mix only circuit is similar to a mix and divide circuit, but does not have a frequency divider. The digital synthesizer provides a signal to the input of the first of the series connected mix and divide circuits, the frequency of which corresponds to a segment of a digital word. The filter is preferably a voltage tunable bandpass filter.

REFERENCES:
patent: 3454883 (1969-07-01), Oropeza et al.
patent: 3838355 (1974-09-01), Papaieck
patent: 4425552 (1984-01-01), Stirling
Budreau, "Compact Fast-Hopping Frequency Synthesizer for Spread-Spectrum Systems", 1982 IEEE Military Communications Conference Record, vol. 1, pp. 9.3-1 to 9.3-3.
"Microwave Frequency Synthesizers", by R. Stirling, Prentice Hall 1987, pp. 44-53.

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