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. 10, 2003
Filed:
Aug. 15, 2001
Rodney J. Chandler, Marsfield, AU;
Jeffrey N. Harrison, Eastwood, AU;
Peter C. Allworth, Wollstonecraft, AU;
Cisco Systems Wireless Networking (Australia) Pty. Limited, North Sydney, AU;
Abstract
An operational amplifier for a pipeline analog-to-digital converter (ADC). The operational amplifier includes a cascaded chain of differential amplifiers, each differential amplifier including resistive-averaged common mode feedback to produce a common mode voltage for the differential amplifier, a particular differential amplifier of the chain having the highest gain of the gains of the differential amplifiers. The operational amplifier has one or more feedback paths each including a compensation capacitor to compensate the operational amplifier. Also included are one or more switches controlled by a control signal to switch on or off the differential amplifiers of the chain other than the highest-gain differential amplifier of the chain such that the power consumption of the operational amplifier is reduced by turning off the differential amplifiers other than the highest-gain differential amplifier while the dynamic response of the operational amplifier is not compromised by the highest-gain differential amplifier being turned on or off.