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On Slew Rate Enhancement in Class-A Opamps Using Local Common-Mode Feedback
Published in IEEE Computer Society
2015
Volume: 2015-February
   
Issue: February
Pages: 244 - 248
Abstract
The output common-mode voltage in multistage fully differential opamps can be set by using a single common-mode feedback loop around all stages or by independent loops for each stage. The two schemes are analyzed for their impact on the slew rate in a two-stage Miller-compensated class-A opamp. Analysis and simulation results show that using local common-mode feedback loops will lead to higher slew rate. This is because, when slewing, both upper and lower transistors receive signal dependent gate voltages with local common-mode feedback, making the behavior similar to that of a class-AB output stage. Also, with local common-mode feedback, the positive and negative slew rates are symmetric. © 2015 IEEE.
About the journal
JournalData powered by TypesetProceedings of the IEEE International Conference on VLSI Design
PublisherData powered by TypesetIEEE Computer Society
ISSN10639667
Open AccessNo
Concepts (15)
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    Amplifiers (electronic)
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    Analog integrated circuits
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    Differential amplifiers
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    Embedded systems
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    Operational amplifiers
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    Power amplifiers
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    Analysis and simulation
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    Common mode feedback
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    Common mode voltage
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    Fully differential
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    INDEPENDENT LOOPS
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    LOCAL COMMON-MODE FEEDBACKS
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    OUTPUT STAGES
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    SLEW RATE ENHANCEMENT
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    FEEDBACK AMPLIFIERS