US Patent 7705686 Injection-locked frequency divider

Patent 7705686 was granted and assigned to National Taiwan University of Science and Technology on April, 2010 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

National Taiwan University of Science and Technology

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7705686

Date of Patent

April 27, 2010

Patent Application Number

11984696

Date Filed

November 21, 2007

Patent Primary Examiner

Robert Pascal

Patent abstract

An injection-locked frequency divider includes a ring oscillator, a signal injection circuit, a first adjustable load circuit and a second adjustable load circuit. The ring oscillator generates an oscillation signal according to a differential signal outputted by the signal injection circuit. According to an adjustable voltage, the first and second adjustable load circuits can respectively change equivalent impedances of the first adjustable load circuit and the second adjustable load circuit so that a free-running frequency of the oscillation signal of the ring oscillator is adjusted and an injection-locked frequency range of the injection-locked frequency divider is expanded.