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:
Jan. 02, 1996
Filed:
Jun. 03, 1994
Applicant:
Inventors:
John Lumsden, Boca Raton, FL (US);
Alan Flum, Boca Raton, FL (US);
Assignee:
Sony Electronics Inc., Park Ridge, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F / ;
U.S. Cl.
CPC ...
330254 ; 330292 ;
Abstract
A variable gain differential amplifier using a single operational amplifier. A potentiometer is used in the negative feedback loop with one end connected to ground through a resistor which limits the maximum gain. The other end is connected to the output and the wiper is connected through a minimum gain limiting resistor to the inverting terminal. This provides an amplifier with good CMRR, relatively low input impedance, wide gain control and variability with a single operational amplifier.