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:
Jun. 06, 2000
Filed:
Nov. 04, 1998
Applicant:
Inventor:
Luca Bertolini, Milan, IT;
Assignee:
STMicroelectronics S.r.l, Agrate Brianza, IT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ; G11C / ; H03F / ;
U.S. Cl.
CPC ...
327 54 ; 327 67 ; 327 87 ; 327103 ;
Abstract
A current sensing circuit with high input impedance comprises a first transconductance amplifier connected across the terminals of a resistor, through which a current to be measured flows. A voltage amplifier is cascade-connected to the first transconductance amplifier. A second transconductance amplifier is feedback connected between an output of the voltage amplifier and a virtual ground node of the voltage amplifier. A ratio between the output voltage of the voltage amplifier and the voltage across the resistor are equal, in absolute value, to a ratio of the transconductances of the first and second transconductance amplifiers.