PLL frequency synthesizer

Details PLL frequency synthesizer PLL frequency synthesizer

2008-07-01

2008-07-01

Pascal, Robert J. (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S025000, C331S074000, C331S017000, C327S156000

Reexamination Certificate

active

07394323

ABSTRACT:
A PLL frequency synthesizer improves near C/N, shortens lockup time, and reduces residual FM. In this apparatus, an input current signal is converted to a voltage signal by one of a plurality of loop filters with different cutoff frequencies and output to a voltage controlled oscillator. An oscillation signal generated by the voltage controlled oscillator is branched at a first junction point and output to a frequency divider and an output terminal. A variable capacitance capacitor is connected to a second junction point branched subsequent to the first junction point and its capacitance is controlled in accordance with loop filter switching control of a control circuit.

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Supplementary European Search Report dated Oct. 10, 2007.

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