Describe how a tank circuit operates and maintains its oscillation.
What will be an ideal response?
When a tank circuit is excited by an external DC source, it oscillates; that is, it produces a back-and-forth current flow. If it were not for the resistance of the circuit, the tank circuit would oscillate forever. However, the resistance of the tank circuit absorbs energy from the current, and the oscillations of the circuit are dampened.
For the tank circuit to maintain its oscillation, the energy that is dissipated must be replaced. The energy that is replaced is referred to as positive feedback. Positive feedback is the feeding back into the tank circuit of a portion of the output signal to sustain oscillation. The feedback must be in phase with the signal in the tank circuit.
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