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. 04, 2008
Filed:
Oct. 30, 2006
Chung-che Yu, Taipei, TW;
Chung-Che Yu, Taipei, TW;
Beyond Innovation Technology Co., Ltd., Taipei, TW;
Abstract
A voltage-controlled current source and a frequency scanner using the same are provided. The voltage-controlled current source includes an impedance circuit, an amplifier, a transistor, and a current mirror. A first terminal of the impedance circuit is coupled to a common voltage. A first terminal of the amplifier is coupled to a second terminal of the impedance circuit, and a second terminal of the amplifier receives a control voltage. A gate of the transistor is coupled to an output terminal of the amplifier, and a first source/drain of the transistor is coupled to the other terminal of the impedance circuit. The current mirror is coupled to a second drain/source of the transistor, and includes a current output terminal, wherein a current output by the current output terminal is proportional to the current flowing through the transistor.