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. 03, 2007
Filed:
Apr. 27, 2005
Raffaele Cetrulo, Austin, TX (US);
Mark Whittington, Austin, TX (US);
Raffaele Cetrulo, Austin, TX (US);
Mark Whittington, Austin, TX (US);
National Instruments Corporation, Austin, TX (US);
Abstract
A low power and high efficiency voltage-to-current (V/I) converter designed with few parts and having improved power supply rejection. The V/I converter may include an op-amp, a MOSFET, and a first and second voltage dividers. The first voltage divider circuit may include a first, second, third, and fourth resistors. A source terminal of the MOSFET may be connected to a junction of the third and fourth resistors and the fourth resistor may be connected to a positive supply rail. Also, an inverting input terminal of the op-amp may be coupled to a junction of the second and third resistors. Additionally, the second resistor may be coupled to the first resistor, which may be connected to an input terminal of the V/I converter. The V/I converter typically has very good DC rejection of the power supply because the first and second voltage dividers are designed to have the same ratios.