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:
Dec. 31, 2002
Filed:
Nov. 30, 2001
Shinji Tanabe, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
Quantizers included in an analog-to-digital converter each compare an input analog voltage with a reference voltage to convert the analog voltage to digital data and output a voltage representative of a difference between the analog voltage and a voltage corresponding to the digital data. In each quantizer includes a comparator comparing the analog voltage with the reference voltage to output a result of comparison. An amplifier amplifies a voltage representative of a difference of the analog voltage from the reference voltage. Another amplifier inverts the voltage representative of the difference of the analog voltage from the reference voltage and amplifies the inverted voltage. A couple of switches are respectively connected to the one and the other amplifier for selecting either one of the output voltages of the amplifiers in accordance with the result of comparison. An exclusive-NOR gate develops the digital data in accordance with the result of comparison and digital data output from the preceding-stage quantizer.