Oscillators – With frequency adjusting means – With voltage sensitive capacitor
Reexamination Certificate
2008-01-08
2008-01-08
Kinkead, Arnold (Department: 2817)
Oscillators
With frequency adjusting means
With voltage sensitive capacitor
C331S167000, C331S1170FE, C331S1170FE, C331S03600C, C331S176000
Reexamination Certificate
active
07317363
ABSTRACT:
There is provided a phase locked loop circuit which receives a reference signal having a reference frequency and a first signal having a first frequency, compares phases of the reference signal and first signal, applies a control voltage based on a phase comparison result to an input terminal of a voltage controlled oscillator to generate a second signal having an oscillation frequency and output the second signal from an output terminal, and supplies the second signal to a divider to divide the frequency of the second signal and output the first signal; and a controller which generates and supplies a control signal to the voltage controlled oscillator, wherein the voltage controlled oscillator has an arrangement in which a coil and variable capacitance are connected in parallel between the input terminal and output terminal, and one of a plurality of capacitances is selectively connected between the input terminal and output terminal by a switch in parallel with the variable capacitance, and ON/OFF of the switch is controlled by the control signal.
REFERENCES:
patent: 6323736 (2001-11-01), Jansson
patent: 6388536 (2002-05-01), Welland
patent: 6803829 (2004-10-01), Duncan et al.
patent: 7221234 (2007-05-01), Chien
patent: 2006/0158264 (2006-07-01), Kousai et al.
patent: 2002-280901 (2002-09-01), None
U.S. Appl. No. 11/735,559 filed Apr. 16, 2007, Kobayashi et al.
Kobayashi Hiroyuki
Kousai Shouhei
Kabushiki Kaisha Toshiba
Kinkead Arnold
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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