Discussion
Which of the following does not adopt any feedback ?
Answer: B
The oscillator that uses no feedback is the UJT relaxation oscillator.
A UJT relaxation oscillator works by charging a capacitor through a resistor until the voltage reaches the UJT's peak point; the UJT then switches on, discharges the capacitor and switches off, and the cycle repeats. Oscillation comes from the negative-resistance region of the UJT, not from feeding part of the output back to the input.
The phase shift, Wien bridge and Colpitts oscillators are feedback oscillators: an amplifier with a frequency-selective feedback network (an RC ladder, a Wien network, or an LC tank) that satisfies the Barkhausen criterion at one frequency.
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