Oscillators – With frequency adjusting means – Variable inductance device
Reexamination Certificate
2007-04-10
2007-04-10
Chang, Joseph (Department: 2817)
Oscillators
With frequency adjusting means
Variable inductance device
C331S1170FE
Reexamination Certificate
active
11280410
ABSTRACT:
An oscillator circuit is formed of a differential LC resonant circuit formed of an L load differential circuit including inductance-variable portions and a capacitive element, and a positive feedback circuit formed of N-channel MOS transistors. The inductance-variable portion is configured to vary the inductance by selecting a plurality of switch circuits arranged between a plurality of arbitrary positions on a spiral interconnection layer and the input/output terminal, and thereby can control an oscillation frequency. The inductance-variable portions form an inductor pair when the switch circuit among the switch circuits coupled between the first input/output terminals is turned on together with the switch circuit.
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Hashizume Yasushi
Komurasaki Hiroshi
Kumamoto Toshio
Sano Tomohiro
Sato Hisayasu
Buchanan & Ingersoll & Rooney PC
Chang Joseph
Renesas Technology Corp.
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