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:
Jul. 07, 2009
Filed:
Nov. 19, 2006
Sheng-lyang Jang, Taipei, TW;
Yun-hsueh Chuang, Taoyuan County, JP;
Ren-hong Yen, Taipei, TW;
Shao-hwa Lee, Taipei County, TW;
Sheng-Lyang Jang, Taipei, TW;
Yun-Hsueh Chuang, Taoyuan County, JP;
Ren-Hong Yen, Taipei, TW;
Shao-Hwa Lee, Taipei County, TW;
National Taiwan University of Science and Technology, Taipei, TW;
Abstract
An injection-locked frequency divider is provided. The injection-locked frequency divider includes a variable reactance unit, a signal injection unit, a first switch, a second switch, a first transformer, and a second transformer. The variable reactance unit, the first switch, the second switch, the first transformer, and the second transformer form a transformer-based LC-tank oscillator. The signal injection unit receives an injection signal. When the injection-locked frequency divider is in a locked state, the transformer-based LC-tank oscillator outputs a frequency division signal. Employing the feedback action of the first transformer and the second transformer, the present invention not only has a wide locking range but also promotes the realization of the low operating voltage.