When using an FET oscillator,the loading effect on the tank circuit is much less than with a bipolar transistor.

Question

Quizplus · Accepted Answer

This is because FETs have a very high input impedance, which means that they draw very little current from the tank circuit, causing minimal loading effects. Bipolar transistors, on the other hand, have a lower input impedance and tend to draw more current, which can impact the resonance of the tank circuit.

When Using an FET Oscillator,the Loading Effect on the Tank