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. 14, 2003
Filed:
Aug. 02, 2001
Jeffrey B. Parfenchuck, Tucson, AZ (US);
David M. Jones, Tucson, AZ (US);
R. Mark Stitt, II, late of Tuscon, AZ (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A temperature-compensated monolithic logarithmic amplifier includes a logarithmic amplifier cell ( ) configured to produce a logarithmic voltage signal (V ) representative of a difference between a first voltage (V ) developed across a first PN junction device (D ) in response to an input signal (I ) and a second voltage (V ) developed across a second PN junction device (D ) in response to a reference signal (I ) and an output circuit ( ) including an output amplifier ( ), a temperature-dependent first resistive element (R ) having a positive temperature coefficient, and a second resistive element (R ). The output circuit ( ) produces a temperature-compensated output signal (V ) in response to the logarithmic voltage signal (V ). The first resistive element (R ) is composed of conductive aluminum or aluminum alloy interconnection metallization that also is utilized as interconnection metallization throughout the monolithic logarithmic amplifier.