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. 12, 2005
Filed:
Aug. 27, 2003
Yoichi Nagaso, Yawata, JP;
Takaharu Saeki, Kyoto, JP;
Yoichi Nagaso, Yawata, JP;
Takaharu Saeki, Kyoto, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A fractional frequency divider () includes a latch () for holding frequency division data, a ΔΣ modulator (), a digital dither circuit () for receiving a digital input F representing fraction part of the frequency division data from the latch () and supplying a digital output alternately changing between F+k and F−k (where k is an integer) or a F value itself to the ΔΣ modulator (), and circuit means (through) for executing fractional frequency division based on integer part (M value) of the frequency division data and an output of the ΔΣ modulator (). The digital dither circuit () is useful for suppressing a spurious signal generated as a result of concentration of quantization noise at a particular frequency when the ΔΣ modulator () receives a particular F value (e.g., F=2).