Oscillation control apparatus

Details Oscillation control apparatus Oscillation control apparatus

2007-12-25

2007-12-25

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C455S260000, C331S17700V

Reexamination Certificate

active

11302247

ABSTRACT:
In a PLL comprising a voltage controlled oscillator (VCO) equipped with a variable resonator, a frequency divider, a phase comparator, and an low pass filter (LPF), a variable resonator control signal generation section has the output voltage of the LPF as an input, detects a f/v sensitivity of the VCO, generates a variable resonator control signal, and controls a capacitance of the variable resonator by the variable resonator control signal. In a disclosed embodiment, when a voltage detection circuit having the output voltage of the LPF as an input detects a predetermined voltage, a data latch circuit transmits a variable resonator control signal based on the voltage detected by voltage detection circuit to variable resonator and performs a variable capacitance control. As a result, the f/v sensitivity of the VCO can be controlled to an optimal value even in the event of PLL configuration element variation or temperature changes.

REFERENCES:
patent: 6323739 (2001-11-01), Andrews
patent: 10-271002 (1998-10-01), None
Transistor Technology, Jun. 1999 Issue, vol. 36, No. 417, p. 230, with English language translation.

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