Discussion
Statement I: A Wien bridge oscillator uses a non-inverting amplifier.
Statement II: A phase shift oscillator uses a non-inverting amplifier.
In the light of the above statements, choose the correct answer.
Answer: C
The first is true and the second is false: the Wien network gives zero phase shift so a non-inverting stage completes the loop, while the phase shift network gives a hundred and eighty degrees and needs an inverting stage to supply the rest. Whether a network shifts by zero or by a half turn decides which kind of amplifier it must be paired with, and that pairing is the first thing to establish about any oscillator topology.
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