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:
Mar. 15, 2011
Filed:
Feb. 24, 2009
Marshall J. Bell, Dripping Springs, TX (US);
Marshall J. Bell, Dripping Springs, TX (US);
Standard Microsystems Corporation, Hauppauge, NY (US);
Abstract
A system and method for a fast stabilizing output buffer. A differential driver circuit is provided with an amplifier stage for receiving a differential input signal and generating a differential output based upon the input signal. The differential output has a corresponding common-mode (CM) voltage level typically based upon a value half of the power supply. A common-mode feedback buffer (CMFB) stage detects a change in the CM voltage level and recovers the CM voltage level to its desired value within a very fast settling time based upon a very high bus frequency. The CMFB stage utilizes a topology comprising only a single device. In one embodiment, this single device is a nmos transistor utilized as a transimpedance stage. Stability is provided by a circuit biasing stage and a shunting capacitor within the CMFB stage.