Mediaspace scheduled maintenance: Aug 25, 2026 07:00 - 12:00 AM. During this time, videos will be temporarily unavailable. Check status updates.

Lecture

Operational Amplifier Structure

Description

This lecture covers the structure of an operational amplifier, including the input and output stages, common emitter intermediate stage, and gain stages. It explains the high input impedance, low output impedance, and unity voltage gain of the push-pull output stage. The lecture also discusses the voltage gain of a common transmitter and the three-stage structure with one polarization.

In MOOC

Electronics II

Official source

Ontological neighbourhood

Physics

Electromagnetism: Electrical networks

Related concepts (22)

Input impedance

The input impedance of an electrical network is the measure of the opposition to current (impedance), both static (resistance) and dynamic (reactance), into a load network that is external to the electrical source network. The input admittance (the reciprocal of impedance) is a measure of the load network's propensity to draw current. The source network is the portion of the network that transmits power, and the load network is the portion of the network that consumes power.

Operational amplifier

An operational amplifier (often op amp or opamp) is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output. In this configuration, an op amp produces an output potential (relative to circuit ground) that is typically 100,000 times larger than the potential difference between its input terminals. The operational amplifier traces its origin and name to analog computers, where they were used to perform mathematical operations in linear, non-linear, and frequency-dependent circuits.

Differential amplifier

A differential amplifier is a type of electronic amplifier that amplifies the difference between two input voltages but suppresses any voltage common to the two inputs. It is an analog circuit with two inputs and and one output , in which the output is ideally proportional to the difference between the two voltages: where is the gain of the amplifier. Single amplifiers are usually implemented by either adding the appropriate feedback resistors to a standard op-amp, or with a dedicated integrated circuit containing internal feedback resistors.

Gain (electronics)

In electronics, gain is a measure of the ability of a two-port circuit (often an amplifier) to increase the power or amplitude of a signal from the input to the output port by adding energy converted from some power supply to the signal. It is usually defined as the mean ratio of the signal amplitude or power at the output port to the amplitude or power at the input port. It is often expressed using the logarithmic decibel (dB) units ("dB gain").

Impedance matching

In electronics, impedance matching is the practice of designing or adjusting the input impedance or output impedance of an electrical device for a desired value. Often, the desired value is selected to maximize power transfer or minimize signal reflection. For example, impedance matching typically is used to improve power transfer from a radio transmitter via the interconnecting transmission line to the antenna. Signals on a transmission line will be transmitted without reflections if the transmission line is terminated with a matching impedance.

Related lectures (35)

Imperfections of Operational Amplifiers: Imperfections MOOC: Electronics I

Explores the imperfections of operational amplifiers and their impact on performance.

Analog Structures: Summary of Operational Amplifiers MOOC: Electronics II

Covers the summary of operational amplifiers, transconductance amplifiers, and analog structure models.

Cascode and Follower Amplifiers: Transistor Basics MOOC: Electronics II

Covers the principles of cascode amplifiers, push-pull amplifiers, and amplifier design.

Imperfections of Operational Amplifiers: Common Mode Rejection Rate MOOC: Electronics I

Explores the imperfections of operational amplifiers, emphasizing the common mode rejection rate and other key parameters.

Source Follower: Large Signal Analysis