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:
Dec. 19, 2000
Filed:
Jan. 30, 1998
Taizo Yamawaki, Kokubunji, JP;
Masaru Kokubo, Hanno, JP;
Tomio Furuya, Gunma-ken, JP;
Kazuo Watanabe, Takasaki, JP;
Julian Hildersley, Royston, GB;
Hitachi, Ltd., Tokyo, JP;
The Technology Partnership PLC, Melbourn, GB;
Abstract
A phase-locked loop circuit includes a current output type phase comparator for converting a phase difference between a first signal and a second signal into a current signal to be outputted, a low pass filter for filtering the current signal of the current output type phase comparator to produce an output signal, a voltage controlled oscillator for producing an output signal having a frequency corresponding to the output signal of the low pass filter, a current source for supplying a current to an input of the low pass filter, a reset switch for applying to the voltage controlled oscillator a reset voltage for canceling a phase-locked state of the phase-locked loop, and a frequency converter for frequency-converting the output signal of the voltage controlled oscillator to produce the second signal.