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. 30, 1991
Filed:
Sep. 06, 1990
Seizo Nakamura, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
In a device for producing a signal in synchronism with the phase of an input signal, a tapped delay timer produces a plurality of signals which have phases different from each other, a selection circuit selectively outputs the output signals of the tapped delay circuit, a frequency divider frequency-divides the output signal of the selection signal, a phase comparator compares the phases of the input digital signal and the output signal of the frequency divider, and a control circuit controls the selection circuit in accordance with the output of the phase comparator, so as to make the phase of the output signal of the frequency-divider to coincide with the input digital signal. A low-pass filter is provided to remove the hazard that is generated in the selection circuit. A waveform shaping circuit is provided to shape the waveform of the output signal of the low-pass filter into rectangular waveform.