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. 12, 1994
Filed:
Sep. 29, 1992
Shiro Hosotani, Hyogo, JP;
Masao Ito, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A voltage comparator for use in a subranging A/D converter includes a coarse preceding comparison circuit 30, a fine preceding comparison circuit 31, and an amplification circuit 32 having an automatic zero compensation function. The coarse preceding comparison circuit 30 compares an analog input voltage Vin and a coarse reference voltage Vai. The fine preceding comparison circuit 31 compares the analog input voltage Vin and a fine reference voltage Vbi. The coarse and fine preceding comparison circuits 30, 31 sequentially outputs comparison results to the amplification circuits 32 so that the comparison results do not overlap each other. The amplification circuits 32 resets offset voltages before amplifying the comparison results applied. The number of elements necessary for a subranging A/D converter can be reduced, and a voltage comparator operating at a high speed and highly accurately can be provided.