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:
Dec. 27, 2005
Filed:
Nov. 13, 2000
Mark Alexander, Austin, TX (US);
Krishnan Subramonium, Austin, TX (US);
Golam Chowdhury, Austin, TX (US);
Kartika Prihadi, Austin, TX (US);
Bryan Cope, Austin, TX (US);
Mark Alexander, Austin, TX (US);
Krishnan Subramonium, Austin, TX (US);
Golam Chowdhury, Austin, TX (US);
Kartika Prihadi, Austin, TX (US);
Bryan Cope, Austin, TX (US);
Cirrus Logic, Inc., Austin, TX (US);
Abstract
An attenuator includes a first stagehaving a first operational amplifierand a tapped resistor. Tapped resistorhas an input for receiving input data, an output coupled to an output of first operational amplifier, and a plurality of taps for selectively presenting a sequence of voltages to a noninverting input of first operational amplifier. Each of these sequences of voltages corresponds to an attenuation step such that first stagesteps the attenuation produced by the attenuator from an intermediate value to a predetermined ending value. A second stageincludes a second operational amplifierand a tapped resistor. Tapped resistorincludes an input for receiving analog data from first stage, an output coupled to an output of second operational amplifier, and a plurality of taps for selectively presenting a sequence of voltages to a noninverting input of operational amplifier. Each of the sequence of voltages corresponds to an attenuation step, a second stagestepping the attenuation from a predetermined starting value to the intermediate value.