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:
May. 27, 2014
Filed:
Dec. 21, 2011
Kosuke Yayama, Kanagawa, JP;
Takashi Nakamura, Kanagawa, JP;
Kosuke Yayama, Kanagawa, JP;
Takashi Nakamura, Kanagawa, JP;
Renesas Electronics Corporation, Kawasaki-Shi, JP;
Abstract
A clock signal capable of changing the frequency in a wide range and with high resolution is generated. An operational amplifier AMPis subject to feedback control so that the voltage of a positive input part equals that of a negative input part. The voltage of a circuit node fbck equals a reference voltage VREFI. A decoder DEC decodes control signals CNTand CNTand turns on one of transistors Tto T. This configuration provides feedback control so that the voltage of the circuit node fbck equals the reference voltage VREFI. This significantly reduces the on-resistances of the transistors Tto Tand prevents the degradation of the frequency accuracy.