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:
Jul. 04, 2000
Filed:
Feb. 23, 1999
Naoyuki Hamanishi, Ichikawa, JP;
Kazuhiro Oda, Isogo-Ku, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In an operational amplifier constituted by a differential stage which receives two input signals IN- and IN+ and outputs a signal NGP corresponding to the potential difference, a level shift stage which receives the signal NGP and outputs a level-shifted signal NGN, and an output stage which receives the signals NGP and NGN and outputs a signal OUT obtained by amplifying the potential difference between the two input signals, the level shift stage is formed from a DDA. Letting A1, A2, and A3 be the gains of the DDA, the input signal NGP, output signal NGN, and bias voltages VBP and VBN have a linear relation given by A3{A1(VBN-NGN)-A2(VBP-NGP)}=NGN. This maximizes the current drivability of a transistor TN1 on the output stage and controls the punch-through current flowing between transistors TP1 and TN1.