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:
Apr. 17, 2007
Filed:
Mar. 10, 2006
Woo Yol Lee, Seoul, KR;
Woo Yol Lee, Seoul, KR;
LG Electronics Inc., Seoul, KR;
Abstract
A reference voltage supplying circuit is disclosed, wherein the circuit generates stable maximum reference voltage and minimum reference voltage to a pipeline Analog to Digital Converter (ADC) even if levels of a first reference voltage and a second reference voltage are changed. According to the present invention, the first reference voltage and a maximum feedback voltage are differentially amplified by a first operational amplifier, and the second reference voltage and a minimum feedback voltage are differentially amplified by a second operational amplifier. Furthermore, a feedback voltage generator generates a maximum feedback voltage and a minimum feedback voltage in response to output signals from the first and second operational amplifiers and feedbacks the voltages to the first and second operational amplifiers, such that if the first and second reference voltages are changed, the maximum and minimum feedback voltages are changed to enable the first and second operational amplifiers to output stable signals. A reference voltage generator is operated in response to the output signals from the first and second operational amplifiers to generate stable maximum and minimum reference voltages.