Phase locked loop circuit that locks the oscillation...

Details Phase locked loop circuit that locks the oscillation... Phase locked loop circuit that locks the oscillation...

2011-03-15

2011-03-15

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S034000, C331S17700V, C327S156000, C455S260000

Reexamination Certificate

active

07907017

ABSTRACT:
In a PLL circuit, an oscillation frequency is quickly and accurately locked to a target frequency. There is provided a PLL circuit, including a VCO that controls the frequency of an output signal according to a voltage of an input signal, a loop divider that divides the frequency of a signal, which is acquired by causing a mixer to mix a local signal generated by a local oscillator and the output signal with each other, by N, and a reference frequency divider that divides the frequency of a reference signal, which is output by a reference signal oscillator, by R. Also provided is a phase comparator that outputs a signal according to a difference in phase between an output of the loop divider and an output of the reference frequency divider, a loop filter that passes low frequency components, and supplies the VCO with the low frequency components, a subtractor that outputs a difference between a voltage of the input signal to be supplied to the VCO so that the frequency coincides with a target value and the output of the loop filter, and switches that supply the loop filter with the output of the phase comparator or the output of the subtractor.

REFERENCES:
patent: 5461344 (1995-10-01), Andoh
patent: 2006/0279363 (2006-12-01), Shirasu
patent: 6-152404 (1994-05-01), None
patent: 2000-40959 (2000-02-01), None
patent: 2005-341024 (2005-12-01), None
English language Abstract of JP 2005-341024.
English language Abstract of JP 6-152404.
English language Abstract of JP 2000-40959.

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