The input stage of an Operational Amplifier has the task of sensing the differential input voltage. This process is disturbed by interference signals such as: offset, bias, drift, noise and common-mode crosstalk. The modeling of these signals has been given in Chapter 2. The level of these additive interference signals determines the useful sensitivity of the amplifier. The design of the input stage should aim at low values of these interference signals, while the current consumption should be low, and a large portion of the rail-to-rail range should be available for common-mode signals.
KeywordsInput Voltage Operational Amplifier Bipolar Transistor Input Stage Input Pair
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