ELEC I.G.A.I.JAYAWEERA PS/2014/134

Intro ducti on What is an Operational Amplifier?

1.Infinite open-loop voltage gain. 2.Infinite bandwidth. 3.Op-Amp can amplify alternating signal. 4.Infinite input impedance. 5.Zero input offset voltage. 6.Very small output impedance. 7.Zero noise.

V + - voltage at the non-inverting terminal V − - voltage at the inverting terminal A v - open-loop gain of the amplifier ( the absence of a feedback loop from the output to the input). V out = A v (V + -V - )

Gradient=A v Saturated Non - Inverting Amplifier

Inverting Amplifier Gradient=A v Av=Av= R in -R f

The use of negative feedback. The voltage gain obtained is predictable. The loss of voltage gain. The need for a high impedance differential amplifier circuit.

 Use in electronics system design  audio- and video-frequency pre-amplifiers and buffers  differential amplifiers  precision rectifiers  precision peak detectors  voltage and current regulators  analog calculators  analog-to-digital converters  digital-to-analog converters  voltage clamps  oscillators and waveform generators

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