Invention Grant
- Patent Title: Fast common mode feedback control for differential driver
- Patent Title (中): 差分驱动器的快速共模反馈控制
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Application No.: US12391414Application Date: 2009-02-24
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Publication No.: US07906994B2Publication Date: 2011-03-15
- Inventor: Marshall J. Bell
- Applicant: Marshall J. Bell
- Applicant Address: US NY Hauppauge
- Assignee: Standard Microsystems Corporation
- Current Assignee: Standard Microsystems Corporation
- Current Assignee Address: US NY Hauppauge
- Agency: Meyertons Hood Kivlin Kowert & Goetzel, P.C.
- Agent Rory D. Rankin
- Main IPC: H03K3/00
- IPC: H03K3/00

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.
Public/Granted literature
- US20100213985A1 FAST COMMON MODE FEEDBACK CONTROL FOR DIFFERENTIAL DRIVER Public/Granted day:2010-08-26
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