电路与电子技术课件（英文版）-第十二章.pptxVIP

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电路与电子技术课件（英文版）-第十二章.pptx

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Operational Amplifier - Differential AmplifierA combination of the inverting and noninverting amplifiers; it finds frequent use in situations where the difference between two signals needs to be amplified.The basic differential amplifier circuit - the two sources v1 and v2 may be independent of each other or may originate from the same process. Operational Amplifier - Differential AmplifierThe basic differential amplifier circuit - the two sources v1 and v2 may be independent of each other or may originate from the same process. Operational Amplifier - Differential AmplifierThe analysis of the differential amplifier is approached by various methods; the one we select to use at this stage consists of Operational Amplifier - Differential AmplifierSince it has been assumed that no current flows into the amplifier, the noninverting terminal voltage is given by the following voltage divider: Operational Amplifier - Differential AmplifierIf the inverting-terminal voltage is assumed equal to v+, then the currents i1 and i2 are found to be Operational Amplifier - Differential Amplifierand sinceThe following expression for the output voltage is obtained: Operational Amplifier - Differential AmplifierThe differential amplifier magnifies the difference btw the two input signals by closed-loop gain R2/R1.In practice, to amplify the difference btw two signals that are both corrupted by noise or some other form of interference. Operational Amplifier - Differential AmplifierIn such cases, the differential amplifier provides an invaluable tool in amplifying the desired signal while rejecting the noise. Operational Amplifier - Differential Amplifier Operational Amplifier - Summary Operational Amplifier - ExamplesEx 8.3 Electrocardiogram (EKG) AmplifierThis example illustrates the principle behind a two-lead electrocardiogram (EKG) measurement. The desired cardiac waveform is given by the difference between the potentials measured by two electrodes suitably placed on the patient’s c