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. 29, 2000
Filed:
Oct. 06, 1998
Sudip Basu, Milpitas, CA (US);
California Micro Devices, Inc., Milpitas, CA (US);
Abstract
Methods and apparatus for providing a rail-to-rail op amp are disclosed. The rail-to-rail op amp includes a P-channel input stage and an N-channel input stage. The P-channel input stage includes a set of P-channel MOS transistors and the N-channel input stage includes a set of N-channel MOS transistors. The set of N-channel MOS transistors and the set of P-channel MOS transistors are capable of connecting to an inverting input and a non-inverting input. The op amp further includes a mirroring circuit adapted for sensing current flowing through the P-channel input stage and mirroring a portion of the sensed current. A threshold voltage reduction circuit is adapted for reducing the threshold voltage of the P-channel input stage in proportion to the mirrored current.