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Barkhausen criterion are a set of two mathematical conditions which a linear electronic circuit must follow to act as an electronic oscillator. Barkhausen’s criterion applies to linear circuits with a feedback loop.
It cannot be applied directly to active elements with negative resistance like tunnel diode oscillators.
The kernel of the criterion is that a complex pole pair must be placed on the imaginary axis of the complex frequency plane if steady state oscillations should take place.
It needs to have positive feedback.
The loop gain is at unity. That is the magnitude of the product of open loop gain and the magnitude of the feedback factor is unity.

An ideal op-amp has infinite bandwidth. Therefore, any frequency signal from 0 to 8 Hz can be amplified without attenuation

As the voltage gain is infinite, the voltage between the inverting and non-inverting terminal (i.e. differential input voltage) is essentially zero for finite output voltage.

A Darlington pair is two transistors that act as a single transistor but with a much higher current gain. This mean that a tiny amount of current from a sensor, micro-controller or similar can be used to drive a larger load.

Tuned amplifiers are the amplifiers that are employed for the purpose of tuning. Tuning means selecting. Among a set of frequencies available, if there occurs a need to select a particular frequency, while rejecting all other frequencies, such a process is called Selection.

A FET amplifier is an amplifier that uses one or more field-effect transistors (FETs). The main advantage of a FET used for amplification is that it has very high input impedance and low output impedance.

The common source circuit provides a medium input and output impedance levels. Both current and voltage gain can be described as medium, but the output is the inverse of the input, i.e. 180? phase change. This provides a good overall performance and as such it is often thought of as the most widely used configuration.

Depending on the amplifier category, one of four types of feedback structures should be used

The load line is drawn by joining the saturation and cut off points. The region that lies between these two is the linear region. A transistor acts as a good amplifier in this linear region.

The frequency response of an amplifier refers to the band of frequencies or frequency range that the amplifier was designed to amplify.

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