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:
Apr. 10, 2007
Filed:
Jun. 15, 2005
Gabriele Manganaro, Boxborough, MA (US);
Gabriele Manganaro, Boxborough, MA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A transresistance amplifier circuit includes an input terminal receiving an input current, an output terminal providing an output voltage indicative of the input current, a first bias current source providing a first bias current to the input terminal, a first transistor, a second transistor, and a biasing circuit. The first transistor is coupled between the output terminal and the input terminal and controlled by a first bias voltage. The second transistor is coupled between a first supply voltage and the output terminal and controlled by a second bias voltage. The biasing circuit generates the first bias voltage for the first transistor for imposing a first voltage at the input terminal. The first voltage is equivalent to a selected voltage of an application circuit and the biasing circuit generates the first bias voltage in a manner so as to allow the first voltage to track variations in the selected voltage.