Analogl Electronics

Aug 6th, 2016
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This document contains adequate information about Operational amplifiers( inverting and non-inverting op amp), characterization and applications.

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SPH 2433 Lecture 3 Sep-Dec 2015SPH 2433 Digital Electronics3. Operational amplifiersAn ideal electronic amplifier is a circuit that takes some input signal and outputs the same signal, unchanged inshape, but increased in voltage, and/or current and power (Figure 3-1).Figure 3-1: Electronic amplification. A triangle is the standard block diagram symbol for an amplifier.The operational amplifier (op amp) is the most common form of IC amplifier.An op amp has got two inputs and one output (Figure 3-2). The input terminal marked as negative (-) is called as aninverting terminal and the input terminal marked as positive (+) is called as a non-inverting terminal of theoperational amplifier.The two inputs are such that:o When a signal is fed to the inverting input, the output signal is 180 out of phase with the input signal.o When a signal is fed to the non-inverting input, the output signal is in phase with the input signal.Figure 3-2: Top panel: circuit diagram of an op amp, bottom panel: 8 pin dual-in-line package (DIP) IC.The op amp has got two supply terminals +VCC and VCC.o For the operation of an op amp a dual polarity DC supply is essential. In the dual polarity supply the +VCCis connected to the positive supply of one power source and the VCC terminal is connected to the negativesupply of another source. However few op amps can also operate on a single polarity supply.o+Typically, the power supply is +/- 15

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