Question

What are the important characteristics of an Operational Amplifier (OP-AMP) ?

Answer 1

Hint:An Operational amplifier is DC – coupled high gain electronic voltage amplifier with a differential input and usually a single-ended output. Operational amplifiers have their origins in analog computers, where they were used to perform mathematical operations in linear, non-linear, and frequency – dependent circuits.

Complete step by step answer:
Today Operational Amplifiers (OP-AMP) are used widely in electronic devices including a vast array of consumers, industrial and scientific devices.
Operational amplifiers were invented by Karl D. Swartzel Jr.
The very first production of the Operational amplifier was done in 1967.
A \[\mu A741\]integrated circuit was one of the most successful operational amplifiers .
Here are some characteristics of an ideal operational amplifier ( OP-AMP)
There is infinite open-loop gain .
\[Gain = \dfrac{{output\;voltage}}{{input\;voltage}}\; = \dfrac{{{V_{output}}}}{{{V_{input}}}}\]
There is infinite input impedance, so there is zero input current.
Operational amplifier works on zero input offset voltage.
Operational amplifier gives infinite output voltage range.
Operational amplifier is noiseless.
Operational amplifiers have zero output impedance.
They have an infinite power supply rejection ratio.

Application of Operational amplifier
-Audio-video frequency pre-amplifiers and buffers.
-Operational amplifiers can be used as differential amplifiers.
-They can be used as filters.
-Operational amplifiers can be used as precision rectifiers.
-In analog calculators Operational amplifiers are used.
-In voltage clamping Operational amplifiers are used.
-Operational amplifiers are used in oscillators and waveform generators.
-Operational amplifiers are used in LOG and ANTILOG amplifiers.

Note:-
In the Operational amplifier here are two golden points.
-In a closed loop the output attempts to do whatever is necessary to make the voltage difference between the inputs zero.
-In the Operational amplifier the input draws no current.