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:
Nov. 12, 2013
Filed:
Oct. 15, 2009
Shoji Kawahito, Hamamatsu, JP;
Jong-ho Park, Hamamatsu, JP;
Satoshi Aoyama, Hamamatsu, JP;
Keigo Isobe, Hamamatsu, JP;
Shoji Kawahito, Hamamatsu, JP;
Jong-ho Park, Hamamatsu, JP;
Satoshi Aoyama, Hamamatsu, JP;
Keigo Isobe, Hamamatsu, JP;
Abstract
A cyclic A/D converter which can reduce the number of reference voltages for D/A conversion is provided. The cyclic A/D converter () comprises a gain stage (), an A/D converter circuit (), a logic circuit (), and a D/A converter circuit (). In an operational action of the gain stage (), an operational value (V) is generated by the use of an operational amplifier circuit () and capacitors (). The gain stage () operates as receiving three kinds of voltage signal from the D/A converter circuit () by the switching of two kinds of voltage signal (V, V) to be applied to the capacitors () in a switching circuit (). That is, the D/A converter circuit () provides a voltage signal (V) to the capacitors (), in response to a value (D=2) of a digital signal (B, B), provides voltage signals (V, V) to the capacitors (), respectively, in response to a value (D=1) of the signal (B, B), and provides the voltage signal (V) to the capacitors (), in response to a value (D=0) of the signal (B, B).