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Electronic Devices & Circuits Oscillators

An RC phase-shift oscillator using an inverting amplifier commonly obtains approximately how much phase shift from its RC feedback network at the oscillation frequency?

A0 degrees
B90 degrees
C180 degrees
D360 degrees from each RC section

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Correct Answer: C. 180 degrees

Explanation: The inverting amplifier contributes about 180 degrees, while the RC network contributes another 180 degrees so the total loop phase shift is 360 degrees.

Reference: Standard analog electronics: RC phase-shift oscillator

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