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. 08, 2002
Filed:
Dec. 03, 1999
Teruhiko Fujisawa, Shiojiri, JP;
Makoto Okeya, Nagano-ken, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
An oscillation circuit produces an oscillation signal in accordance with the oscillation frequency of a quartz oscillator 81, and a frequency dividing circuit divides the frequency of the oscillation signal to produce a sampling clock CKs having a duty ratio of 1/8. A constant-voltage circuit is operated during the period in which the sampling clock CKs takes an “H” level, and is stopped during the period in which the sampling clock CKs takes an “L” level. During the period in which the constant-voltage circuit stops the operation, a voltage Vreg affected by fluctuations in a second lower potential side voltage Vss is generated. However, since the cycle of the sampling clock CKs is short, a fluctuation width of the voltage Vreg is suppressed. Power consumption of the constant-voltage circuit is reduced.