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:
Oct. 30, 2001
Filed:
Nov. 19, 1998
Yoji Ishikawa, Machida, JP;
Asahi Kasei Kabushiki Kaisha, Osaka, JP;
Abstract
Signal C=[C,, C,, . . . , C,, C,] generated by a ring counter,is converted at a logic circuit,to a triangle pulse signal Q in which the carrier frequency of the PWM signal is equal to the frequency of the signal C raised to power of 2. The signal Q is input to the B input of a magnitude comparator,. On the other hand, the modulation data D held by a data holding circuit,is compared with the converted signal Q in the magnitude comparator,, and when the data D is greater than the signal Q, a PWM signal is obtained from the comparison result A>B. This PWM signal has no phase change and high resolution and is a low pulsating component. The resolution of the PWM signal per cycle of the ring counter,is held at n bits, and the carrier frequency is equal to the ring counter frequency raised to mth power of 2.