Invention Grant
US07679437B2 Split-feedback technique for improving load regulation in amplifiers
有权
分频反馈技术,用于改善放大器中的负载调节
- Patent Title: Split-feedback technique for improving load regulation in amplifiers
- Patent Title (中): 分频反馈技术,用于改善放大器中的负载调节
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Application No.: US12043149Application Date: 2008-03-06
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Publication No.: US07679437B2Publication Date: 2010-03-16
- Inventor: Preetam Charan Anand Tadeparthy , Vikram Gakhar
- Applicant: Preetam Charan Anand Tadeparthy , Vikram Gakhar
- Applicant Address: US TX Dallas
- Assignee: Texas Instruments Incorporated
- Current Assignee: Texas Instruments Incorporated
- Current Assignee Address: US TX Dallas
- Agent William B. Kempler; Wade J. Brady, III; Frederick J. Telecky, Jr.
- Main IPC: H03F1/36
- IPC: H03F1/36

Abstract:
A circuit arrangement and method for improving load regulation in an amplifier (e.g., LDO amplifier) uses a feedback circuit including a parallely connected feedback resistance Rf and a noise reduction feedback capacitance Cf, wherein an external capacitance has equivalent series resistance (ESR). The circuit arrangement includes a resistance Resr in the amplifier output, a junction point of the feedback resistance Rf and the feedback capacitor Cf being connected to a negative input of the LDO amplifier. Additionally, the circuit arrangement might include a resistance Rintentional in between Cf and Rf. The circuit arrangement provides good load regulation and better stability without increase in power/area. The arrangement supports external feedback mode providing design flexibility without compromising amplifier-stability, which provides high output current drive capability or enables driving heavy output capacitance. In a preferred form the invention includes split feedback including AC feedback and DC feedback.
Public/Granted literature
- US20090224827A1 Split-feedback Technique for Improving Load Regulation in Amplifiers Public/Granted day:2009-09-10
Information query
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