Oscillators – L-c type oscillators
Reexamination Certificate
2011-06-07
2011-06-07
Mis, David (Department: 2817)
Oscillators
L-c type oscillators
C331S1170FE, C331S1170FE, C331S17700V
Reexamination Certificate
active
07956698
ABSTRACT:
A high-frequency voltage-Controlled oscillation circuit which does not oscillate abnormally, is improved in phase noise, and has a small circuit scale. A phase shift circuit composed of third or more order odd π low-Pass filter and capacitive variable-reactance elements (D1, D2) connected to the input and output of the low-pass filter in series respectively is inserted in a feedback loop of a transistor of an oscillation amplifier circuit. The low-pass filter is composed of an inductive reactance element (L3) connected to the feedback loop in series and capacitive variable-reactance elements (D4, D5) parallel connected to the input and Output of the inductive reactance element (L3). The inductive reactance element (L3) is a C-Shaped, a donut-Shaped, or a U-Shaped microstrip line. Thus, a high-frequency voltage-Controlled oscillation circuit is realized.
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Japanese Office Action and translation dated Apr. 28, 2009.
Jacobson & Holman PLLC
Mis David
Nihon Dempa Kogyo Co. Ltd
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