Hybrid frequency synthesizer

Details Hybrid frequency synthesizer Hybrid frequency synthesizer

1995-09-01

1997-08-12

Pascal, Robert

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

327107, 364721, 36471801, 375376, 331 25, H03B 2100, G06F 102

Patent

active

056569769

ABSTRACT:
A hybrid frequency synthesizer combining a direct frequency synthesizer and a PLL synthesizer are disclosed. The direct frequency synthesizer includes a first and second phase accumulator, the second phase accumulator inputting K/N phase data and operating at M times faster than the first phase accumulator, a 360 degree detector adding the outputs of the first and second phase accumulators and detecting a point in time at which the added values become 360 degrees, which point in time is provided to the initialization circuit. The initialization circuit initializes the state of the first and second phase accumulators and controls the output timing of the first phase accumulator so as to synthesize the next period of the output frequency at the initialized time. Accordingly, the present invention simplifies the construction, and is economical.

REFERENCES:
patent: 4965533 (1990-10-01), Gilmore
patent: 4992743 (1991-02-01), Sheffer
patent: 5028887 (1991-07-01), Gilmore
patent: 5375065 (1994-12-01), Owen
patent: 5382913 (1995-01-01), Carson et al.
Seki, et al.: "High Resolution and Fast Frequency Settling PLL Synthesizer": pp. 115-120; NIT Radio Communication Systems Laboratories.

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