Invention Grant
US07683715B2 Feedback biasing technique for a stage of an amplifier that uses a feedback control loop having low gain
有权
用于使用具有低增益的反馈控制回路的放大器级的反馈偏置技术
- Patent Title: Feedback biasing technique for a stage of an amplifier that uses a feedback control loop having low gain
- Patent Title (中): 用于使用具有低增益的反馈控制回路的放大器级的反馈偏置技术
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Application No.: US12147479Application Date: 2008-06-27
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Publication No.: US07683715B2Publication Date: 2010-03-23
- Inventor: Ravpreet Singh
- Applicant: Ravpreet Singh
- Applicant Address: US TX Dallas
- Assignee: Texas Instruments Incorporated
- Current Assignee: Texas Instruments Incorporated
- Current Assignee Address: US TX Dallas
- Agent John J. Patti; Wade J. Brady, III; Frederick J. Telecky, Jr.
- Main IPC: H03F3/45
- IPC: H03F3/45
Abstract:
According to an aspect of the present invention, a stage of an amplifier contains a positive feedback loop in addition to a negative feedback loop to maintain the bias currents at a desired level in the active components providing the output of the amplifier. The positive feedback loop senses the finite gain (i.e., less than the ideal infinite gain) of the negative feedback loop and compensates for the finite gain. Due to the use of the positive feedback, the duration and extent of deviation of the bias currents from the desired level is reduced, thereby minimizing the distortions in the output of the amplifier. In an embodiment, the stage corresponds to a class AB stage.
Public/Granted literature
- US20090322420A1 Feedback Biasing Technique For A Stage Of An Amplifier That Uses A Feedback Control Loop Having Low Gain Public/Granted day:2009-12-31
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