PLL/FLL with voltage controlled oscillator

Details PLL/FLL with voltage controlled oscillator PLL/FLL with voltage controlled oscillator

2010-03-19

2011-12-13

Kinkead, Arnold (Department: 2817)

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

C331S1170FE, C331S1170FE, C331S167000, C331S17700V

Reexamination Certificate

active

08076985

ABSTRACT:
Provided is a voltage-controlled oscillator that can hold an oscillation frequency at a desired value when an oscillation frequency changes due to the temperature, without narrowing a variable range of the oscillation frequency, and a PLL circuit, an FLL circuit, and a wireless communication device, which use the voltage-controlled oscillator. A control voltage Vt is applied to a connection point Y between variable capacitors121and122included in a variable capacitance circuit120. A control signal Fse1is applied to a switching element132included in a capacitance switching circuit130. A power-supply voltage Vdd is applied by a control section170to a connection point X between inductors111and112included in an inductor circuit110. A voltage value of the power-supply voltage Vdd is controlled such that the oscillation frequency of the local oscillation signal is held at a constant regardless of a temperature change.

REFERENCES:
patent: 7336138 (2008-02-01), Kitamura et al.
patent: 9-223929 (1997-08-01), None
patent: 10-126154 (1998-05-01), None

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