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2 cards from this section. Quick, good the night before a test.
Define positive feedback in your own words.
Think about how sounds amplify when you use a microphone near a speaker.
What are Barkhausen's Criteria?
Recall the minimum requirement for a sustained oscillation.
What is the role of positive feedback in oscillators?
Think about how echoes work as a form of feedback.
Barkhausen's Criteria requires that the loop gain must be less than 1.
Refer back to the definition of Barkhausen's Criteria.
Given a hypothetical oscillator with a loop gain of 0.8, analyze how you could alter the circuit to meet Barkhausen's Criteria.
Consider modifying the gain stage components in your analysis.
Create a simulation of an oscillator circuit and determine if it meets Barkhausen's Criteria. If it doesn't, suggest modifications.
Observe the output waveforms and measure the gain and phase shifts.
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