Transcription of Fully-Differential Amplifiers (Rev. E) - Texas Instruments
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Fully-Differential Amplifiers (Rev. E) - Texas Instruments
Application ReportS1 Fully-Differential AmplifiersJames KarkiAAP Precision AnalogABSTRACTD ifferential signaling has been commonly used in audio, data transmission, and telephonesystems for many years because of its inherent resistance to external noise sources. Today,differential signaling is becoming popular in high-speed data acquisition, where the ADC sinputs are differential and a differential amplifier is needed to properly drive other advantages of differential signaling are reduced even-order harmonics andincreased dynamic report focuses on integrated, Fully-Differential Amplifiers , their inherent advantages, andtheir proper use.
The purpose of the Vocm input in the fully-differential amplifier is to set the output common-mode voltage. In a standard operational amplifier with single-ended output, the output common-mode voltage and the signal are the same thing. There is typically one feedback path from the output to the negative input in a standard operational amplifier.
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