Oscillator and a PLL circuit using the oscillator

Details Oscillator and a PLL circuit using the oscillator Oscillator and a PLL circuit using the oscillator

2008-03-11

2008-03-11

Kinkead, Arnold (Department: 2817)

Oscillators

L-c type oscillators

C331S1170FE, C331S1170FE, C331S17700V, C331S10800D, C336S200000

Reexamination Certificate

active

07342464

ABSTRACT:
The functionality and performance of a voltage-controlled oscillator are improved by enabling continuously adjusting an inductor by a control signal. The oscillator has a variable inductor unit with variable inductance; a variable capacitance device connected to the variable inductor unit; an output unit that oscillates at an oscillation frequency determined by the inductance of the variable inductor unit and the capacitance of the variable capacitance device; and a control signal generator for modulating the oscillation frequency. The variable inductor unit has a first inductor; a current signal generator for detecting an electric signal denoting current flowing to the first inductor, and generating a current signal based on the electric signal; and a second inductor that receives the current signal. The first inductor and second inductor are disposed to a predetermined magnetically coupled position, and the variable inductor unit sets the inductance of the first inductor desirably.

REFERENCES:
patent: 5952893 (1999-09-01), Ghoshal
patent: 2004/0183606 (2004-09-01), Komurasaki et al.
patent: 2002-151953 (2002-05-01), None
patent: 2004-266718 (2004-09-01), None

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