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. 28, 1998
Filed:
Jun. 03, 1997
Applicant:
Inventor:
Yoshio Nishida, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
327 94 ; 327 96 ;
Abstract
In a differential sample-hold circuit used in a serial-parallel type A/D conversion circuit containing a current-added type D/A converter, a pair of differential analog input voltages Vin1 and Vin2 are supplied to a non-inverting input and an inverting input of a buffer amplifier. An non-inverted output and an inverted output of the buffer amplifier are supplied through a pair of switches to one end of a pair of voltage holding capacitors having their other end connected to ground, respectively, and also to an input of a pair of closed-loop buffer amplifiers having their outputs for outputting a pair of differential sampled-and-held voltages.