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:
Nov. 14, 2000
Filed:
Nov. 25, 1998
Hiroshi Mitani, Yokohama, JP;
Nobutaka Kitagawa, Kawasaki, JP;
Kazuhito Fujii, San Francisco, CA (US);
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A frequency multiplier circuit needs to have a voltage controlled oscillator circuit having a wide oscillation frequency range, or delay cells each having a delay value which can be controlled over a wide range. Depending on the frequency multiplication factor, however, a frequency multiplied clock signal susceptible to influence of noise is generated. In the disclosed frequency multiplier circuit, there are provided a phase comparison input selection circuit for conducting a selection out of output signals of delay cells forming a voltage controlled delay circuit according to a frequency multiplication factor setting signal and an input frequency range setting signal and outputting the selected signal to a phase comparator, and a selected waveform generation circuit for generating a frequency multiplied clock signal CKOUT from the output signals of the delay cells according to the frequency multiplication factor setting signal and the input frequency range setting signal.