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:
Nov. 27, 2007
Filed:
Feb. 03, 2006
Hisayoshi Uchiyama, Ora-gun, JP;
Futoshi Wakai, Isesaki, JP;
Hisayoshi Uchiyama, Ora-gun, JP;
Futoshi Wakai, Isesaki, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
In the current-controlled oscillator performing an oscillation frequency control by using a differential amplifier circuit, resistors are inserted to each current path of a differential pair of the differential amplifier circuit, and thereby an inclination of output currents Ia, Ib of a differential pair is small in the linear line region. Further, by setting a reference voltage applied to a base of a transistor of one side of the differential pair lowly, the linear region is shifted to low voltage side, and thereby a saturation region of the low voltage side is not occurred. Moreover, when a comparison result of a phase of an output signal of the current-controlled oscillation circuit and a reference signal is converted to an oscillation frequency control voltage V, by limiting an upper limit voltage of the Vby an output of a regulator in stead of a positive voltage power source Vof common circuit, the Vdoes not move to a saturation region upper than the linear region. According to the current-controlled oscillator, it is possible to prevent deterioration of a phase noise characteristic or deadlock caused by an inclination or a width of the linear region of the output characteristic of the differential amplifier circuit.