Explanation of Oscillation From Tank Circuit

Oscillation from Tank Circuit

If there were no losses in the tank circuit to consume the energy the interchange of energy between inductor (L) and capacitor © would continue indefinitely. But in practical tank circuit there are resistive and radiation losses in the coil and dielectric losses in the capacitor. Due to these losses the oscillating waveform gradually decreases and eventually it becomes zero.

In order to make the continuous oscillation in the tank circuit, it is necessary to supply correct amount of energy to the tank circuit at the proper time intervals. The polarity of the applied energy must confirm the existing polarity. Therefore in order to make the oscillations in the circuit undamped (continuous), the following conditions must be fulfilled.

1. The amount of energy supplied should be such so as to meet the losses in the tank circuit and the AC energy removed from the circuit by the load.
2. The applied energy should have the same frequency as that of the oscillation in the tank circuit.
3. The applied energy should be in phase with the oscillations set up in the tank circuit i.e. it should aid the tank circuit oscillations.

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