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, 1998
Filed:
Apr. 10, 1996
Toru Takaishi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An oscillating circuit 30 outputs a signal .o slashed..sub.o whose pulse cycle T is a linear function T=kS+m of a control input value S. A frequency control circuit 10, every time a counter 11 counts a number Nr of pulses of a reference signal .o slashed..sub.r, calculates S=No-m/k, where No is a count of .o slashed..sub.o counted by the counter 12, makes a judgement on convergence of .o slashed..sub.o based upon the difference between input and output values of a register 14, makes the register 14 hold S, updates Nr=S+m/k and clears the counter 12 to 0. A digital phase control circuit 20 judges a advance/delay of the phase of .o slashed..sub.o relative to .o slashed..sub.r with a phase comparator circuit 21, decrements/increments a count with a counter circuit 22 every time a judgement on the advance/delay of the phase is made and when the result of the judgement on the advance/delay of the phase is reversed from the previous result of that, changes the count to a value that is half the number of times that the same judgement was made successively before the reversal.