Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular frequency control means
Reexamination Certificate
2005-06-14
2005-06-14
Kinkead, Arnold (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular frequency control means
C331S1170FE, C331S183000, C331S182000, C331S185000, C331S17700V, C331S1170FE, C455S260000, C455S180400, C455S182200, C455S180300, C455S179100, C327S156000
Reexamination Certificate
active
06906596
ABSTRACT:
A voltage controlled LC resonance oscillation circuit has a plurality of capacitive elements connected to an output node. These capacitive elements are applied with voltages at opposing terminals for selecting an oscillating frequency band, so that the oscillating frequency band can be changed step by step in accordance with the selection voltage. The capacitive elements include at least one variable capacitive element such as a MOS capacitor, the capacitance of which is varied in accordance with a voltage applied thereto. The MOS capacitor is similar in structure to a MOS transistor. The variable capacitive element can be supplied at a terminal opposite to the output node with a voltage from a variable voltage source, for example, in place of the selection voltage. The voltage controlled LC resonance oscillation circuit can measure the output amplitude and oscillating frequency without affecting the characteristics thereof, and reduce the parasitic capacitance.
REFERENCES:
patent: 6268778 (2001-07-01), Mucke et al.
patent: 6750727 (2004-06-01), Sutardja
Dec Aleksander
Kimura Yasuyuki
Kitamura Tomomitsu
Suyama Ken
Epoch Microelectronics, Inc.
Kinkead Arnold
Mattingly ,Stanger ,Malur & Brundidge, P.C.
Renesas Technology Corp.
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