TUNED AMPLIFIERS USING BJT






circuit diagram tuned amplifier


Figure shows the Circuit Diagram of Single Tuned Amplifier with Neutralisation network


Know more about Unilateralisation




TUNED AMPLIFIER


Tuned Amplifiers are used to Amplify a signal of specific frequency or a narrow band frequency Range.
Like, Audio Amplifiers it doesnt amplify the entire or wide frequency range of input signal. But it amplify a particular frequency signal.
So tuned amplifiers having Narrow Band Width.




Tuned amplifiers are commonly used whenever, High selectivity is required.


Basic Principle Of Tuned Amplifiers

Tuned amplifier using BJT is working on the basic principle of Resonance.
The tank circuit in the Collector terminal is Tuned to Certain Frequency which is called "RESONANT FREQUENCY."

The tank circuit consist of an Inductor,L and a Capacitor C, in parallel.
It is possible to vary the Resonant Frequency by adjusing the value of Capacitor.

Working Of Single Tuned Amplifiers


Single Tuned Amplifiers consist of only one Tank Circuit and the amplifing frequency range is Determined by it.

By giving signal to its input terminal of various Frequency Ranges. The Tank Circuit on its collector delivers High Impedence on resonant Frequency, Thus the amplified signal is Completely Available on the output Terminal.

And for input signals other than Resonant Frequency, the tank circuit provides lower imedence, hence most of the signals get attenuated at collector Terminal.

Circuit Diagram For SINGLE TUNED AMPLIFIER


single tuned power amplifier


Points To Ponder

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- Narrow Band Width
- High Selectivity
- High frequency amplification
- Used in Radio Frequency
- Amplifing Frequency Can be varied




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