PLL oscillation circuit

Details PLL oscillation circuit PLL oscillation circuit

2007-06-19

2010-02-02

Cox, Cassandra (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S150000

Reexamination Certificate

active

07656208

ABSTRACT:
A digitally controlled PLL oscillation circuit has a VCO, a frequency divider, a reference oscillation circuit, an A/D converter, a phase comparator, a digital filter, a D/A converter, and an analog filter. A reference signal supplied from the reference oscillation circuit is output through a narrow-band crystal filter (MCF) to the A/D converter to cancel noise, jitter and a spurious wave included in the reference signal, making it possible to prevent the phase noise characteristic and spurious characteristic of a VCO output from being degraded.

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patent: 10-013228 (1998-01-01), None
patent: 2004-253945 (2004-09-01), None

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