What is the negative feedback path in a crystal oscillator?

In a crystal oscillator, the negative feedback path is indeed the same as the crystal's pathway. This is essential for the operation of the oscillator because the crystal acts as a frequency-selective element. It provides the necessary feedback at its resonant frequency, allowing the circuit to maintain stable oscillations.

The design of the oscillator relies on applying a part of the output signal back into the input through the crystal, which reinforces the oscillation at the crystal's natural frequency. This feedback is crucial, as it governs the frequency stability and precision of the oscillator. The feedback must align closely with the oscillation path established by the crystal to effectively sustain the oscillation at a constant frequency.

Other options present different interpretations of the feedback path, which do not accurately describe its function in relation to the crystal. The feedback must be tightly coupled to the crystal's pathway for the oscillator to behave predictably and efficiently.