Question

What Are The Types Of Amplifiers?

Answer 1

Hint: An amplifier, often known as an electrical amplifier or (informally) amp, is a device that can boost the power of a signal (a time-varying voltage or current). It's a two-port electrical circuit that uses power from a power source to boost the amplitude of a signal supplied to its input terminals, resulting in a signal with a proportionately higher amplitude at the output. The gain of an amplifier is defined as the ratio of output voltage, current, or power to input voltage, current, or power. A circuit with a power gain higher than one is known as an amplifier.

Complete step-by-step solution:
Although amplifiers are sometimes categorised based on input and output parameters, there are four fundamental types:
Current Amplifier: As the name implies, a current amplifier increases the input current. A low input impedance and a high output impedance describe it.
Voltage Amplifier: An amplifier that amplifies a given voltage to produce a higher voltage output. It has a very high input impedance and a very low output impedance.
Transconductance amplifier: An amplifier that alters output current in response to variations in input voltage is known as a transconductance amplifier.
Transresistance amplifier: An amplifier that changes output voltage in response to changing input current is known as a transresistance amplifier. A current-to-voltage converter is another name for it.
Power Amplifiers: Power amplifier is a generic word that refers to the amount of power produced by the power supply circuit or the amount of power transmitted to the load, however it is not strictly a type. It's often found in a circuit's final output stages.
OP AMP: An op-amp, or operational amplifier, is a type of integrated circuit that works as a voltage amplifier with differential input. It has two inputs, one positive and one negative, but only one output with an extremely high gain. Originally, valves were used to make op-amps.

Note: A servo amplifier is a device with an inbuilt feedback loop that allows the output to be actively controlled at a certain level. A DC servo is used at frequencies below DC levels, where there are no fast oscillations in an audio or RF signal. These are commonly employed in mechanical actuators or devices that require a consistent speed or torque, such as DC motors. Some AC motors can be controlled using an AC servo amplifier.