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:
Aug. 06, 1985
Filed:
Oct. 18, 1983
Applicant:
Inventors:
Yusuf Haque, San Jose, CA (US);
Erwin Ofner, Graz, AT;
Assignee:
American Microsystems, Inc., Santa Clara, CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F / ; H03F / ;
U.S. Cl.
CPC ...
330253 ; 330277 ;
Abstract
A differential operational amplifier is provided with a feedback loop which continuously adjusts the common mode voltage level of the amplifier so that it lies in the center of the dynamic range of the amplifier. The feedback loop measures the instantaneous common mode voltage level and compares it with a reference voltage which is set to reflect the desired common mode voltage. An error signal is generated and fed back into the amplifier to adjust the instantaneous common mode voltage level towards the reference level. Frequency compensation is also provided to overcome the phase shift introduced by the use of RC networks.