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:
Jan. 13, 1998
Filed:
Feb. 12, 1997
Shigenori Yamauchi, Nisshin, JP;
Takamoto Watanabe, Nagoya, JP;
Tadashi Shibata, Toyokawa, JP;
Yoshinori Fujihashi, Nukata-gun, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
A frequency multiplying device which multiplies the frequency of an externally-supplied reference signal PREF includes a digitally-controlled oscillation circuit, which includes a ring oscillator formed of thirty-two inverting circuits in a ring configuration which are adapted to generate sixteen clock signals having a period that is thirty-two times the inversion time of each inverting circuit and a phase interval that is twice the inverting circuit inversion time, and produces an output signal POUT having a period that corresponds to frequency control data CD at a resolution of the phase difference time of the clock signals, a counter/data-latch circuit which counts the clock signal RCK released by the ring oscillator within one period of the reference signal PREF and delivers the frequency control data CD of the count value to the digital oscillation circuit, and a control circuit which controls the operation of the circuits so that the oscillation output signal POUT having the frequency of the reference signal PREF multiplied by sixteen (32/2) is generated by the digital oscillation circuit.