Parallel accumulator fractional-n frequency synthesizer

Details Parallel accumulator fractional-n frequency synthesizer Parallel accumulator fractional-n frequency synthesizer

1997-08-12

1998-07-07

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 25, 377 48, H03L 7197

Patent

active

057775214

ABSTRACT:
A frequency synthesizer (10) including a synthesizer loop (12) with a fractional-N divider (14), and including a divider control circuit (18) and a combining circuit (22). The divider control circuit (18) provides a variable divide value (20) to the divider (14). The carry values of two accumulators (24, 26) having differing accumulator lengths are applied in parallel to the combining circuit (22). Each of the accumulators (24, 26) provides a portion of a desired fractional divide value (20). The combining circuit (22) also adds an integer divide value (36) to the fractional divide value (16). By coupling the accumulators (24, 26) in parallel, a high frequency resolution with minimal spurious frequencies is achieved, using a simple, low cost circuit.

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patent: 5610559 (1997-03-01), Dent

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