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:
Nov. 20, 1990
Filed:
Jul. 21, 1989
Miki Moyal, Austin, TX (US);
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
There is disclosed an operational amplifier which is arranged for sensing the voltages provided by a plurality of input voltage sources and which diminishes the level of noise at the operational amplifier output resulting from the selection of the input voltage sources. The operational amplifier includes a first amplification stage having first and second voltage sensing intputs, a common input, and an output, and a second amplification stage having an input and an output. Switch means are disposed between the first stage output and the second stage input for selectively coupling the amplified signal at the first stage output resulting from an input signal at the first input to the second stage input or the amplified signal at the first stage output resulting from an input signal at the second input to the second stage input. Because the switch means is disposed between the first and second amplification stages, the noise coupled into the operational amplifier is not amplified by the first amplification stage and hence, the noise at the output of the operational amplifier is deceased by a factor equal to the gain of the first amplification stage.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile