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:
Feb. 20, 2001
Filed:
Dec. 10, 1998
Bangalore Kodandaram Srinath, Bangalore, IN;
Scott E. Smith, Sugar Land, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A bandgap reference circuit (,) with improved startup circuitry is disclosed. The bandgap reference circuit (,) includes a startup node (NBIAS) that is connected to the gates of n-channel MOS transistors (,) in first and second conduction legs of a current mirror. A series of inverters (,) turn on a transistor (,) that is connected between a precharge node (TO) and the startup node (NBIAS) in response to a signal (RID) indicating recent power-up of a power supply voltage (V,). A capacitor (,) is also provided, and which is discharged upon power-down. The capacitor (,) is connected to the gate of a p-channel transistor (,) that has its source/drain path connected between the precharge node (TO) and the startup node (NBIAS), and that is turned on upon power-up, even if the power-up signal (RID) is not generated, thus ensuring initiation of the bandgap reference circuit (,).