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. 14, 1999
Filed:
Nov. 13, 1997
Applicant:
Inventor:
Hidefumi Kushibe, Kamakura, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05F / ;
U.S. Cl.
CPC ...
327543 ; 327540 ; 327541 ;
Abstract
There are provided a start circuit for a constant current circuit, a constant current circuit including the start circuit, and an operational amplifier including the constant current circuit. When an output stop signal PD changes from an inactivation mode to an activation mode, changes of transistors MN3 and MP6 to their off states are delayed for a moment by a delay circuit DL or a switch SW1 to temporarily lower the bias node and to reliably start the circuit. Therefore, the circuit does not need a large capacitor and prevents entry of noise through the capacitor.