Which of the following components can be used to reduce thermal drift in crystal oscillators?
NP0 capacitors✓Correct answer
Toroidal inductors
Wirewound resistors
Non-inductive resistors
Explanation
NP0 (C0G) ceramic capacitors have a nominally zero temperature coefficient, so their capacitance barely changes as the circuit warms up. Using them in the frequency-determining network keeps thermal drift low; other dielectrics vary strongly with temperature.