What is a Operational Amplifier ?

Op Amp Definition

An op amp (operational amplifier) is defined as a DC-coupled voltage amplifier with a high voltage gain used in various electronic circuits.

Working Principle

The op amp amplifies the difference between two input signals, known as the differential input voltage, in its open loop operation.

Closed Loop Operation

In closed loop mode, feedback is introduced to control the output signal, with positive feedback used for oscillators and negative feedback for amplifiers.

Op Amp Characteristics

• Infinite voltage gain (So that maximum output is obtained)

• Infinite input resistance (Due to this almost any source can drive it)

• Zero output resistance (So that there is no change in output due to change in load current)

• Infinite bandwidth

• Zero noise

• Zero power supply rejection ratio (PSSR = 0)

• Infinite common mode rejection ratio (CMMR = ∞)

Op Amp Applications

Op amps are versatile and used in many applications, including amplifiers, buffers, summing circuits, differentiators, and integrators, due to their reliability and efficiency.