The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 07, 2011
Filed:
Sep. 03, 2009
Takehito Ishii, Sayama, JP;
Takehito Ishii, Sayama, JP;
Nihon Dempa Kogyo Co., Ltd, Tokyo, JP;
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 (D, D) 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 (L) connected to the feedback loop in series and capacitive variable-reactance elements (D, D) parallel connected to the input and Output of the inductive reactance element (L). The inductive reactance element (L) is a C-Shaped, a donut-Shaped, or a U-Shaped microstrip line. Thus, a high-frequency voltage-Controlled oscillation circuit is realized.