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:
Mar. 06, 2001
Filed:
Oct. 13, 1999
Mark J. Mercer, Tuscon, AZ (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A low dropout voltage reference having three gain stages and two feedback loops, an overall loop and a secondary loop, is disclosed. The overall feedback loop establishes a desired output voltage. The secondary feedback loop provides two benefits: (1) a broadband reduction of the output impedance to ensure stability under various loading conditions and (2) an improvement in power supply rejection. The first benefit ensures that the pole created by the load capacitance and the output impedance of the amplifier doesn't adversely affect the overall loop stability. The second benefit helps improve line regulation. The low dropout voltage reference does not rely on a capacitor connected to the output to properly compensate the overall feedback loop. Therefore, the reference will work properly for a wide range of load capacitance values.