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. 19, 2016
Filed:
Nov. 26, 2014
Altera Corporation, San Jose, CA (US);
Vishal Giridharan, San Jose, CA (US);
Allen K. Chan, San Jose, CA (US);
Altera Corporation, San Jose, CA (US);
Abstract
An integrated circuit having transceiver circuitry is provided. The transceiver circuitry may include an equalization circuit such as a decision feedback equalizer (DFE). The DFE may include a variable gain amplifier (VGA) that is coupled to a summation node circuit and a digital sampler. The DFE may also include an operational amplifier that is coupled in a negative feedback loop and that provides a controlled power supply voltage to the VGA so that the VGA is able to provide a stable common mode output voltage to the digital sampler. The operational amplifier may be a self-biased operational amplifier with an output stage that includes miller compensation circuitry for enhanced stability.