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. 27, 1999
Filed:
Apr. 15, 1997
Applicant:
Inventors:
Michael Y Zhang, Palo Alto, CA (US);
Ignatius Bezzam, Mountain View, CA (US);
Assignee:
Fairchild Semiconductor Corporation, South Portland, MA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F / ;
U.S. Cl.
CPC ...
330253 ; 330261 ;
Abstract
A CMOS rail-to-rail input/output operational amplifier has constant supply current with respect to the input signal's common mode voltage. By use of current bleeders, i.e. a smaller transistor of opposite conductivity type connected in parallel with each transistor in the differential pair of transistors, there is provided constant transconductance and constant supply current for rail-to-rail operation with respect to the positive and negative supply voltages. This allows production of a low cost, high performance and small area rail-to-rail input/output operational amplifier.