Oscillators – N4notes

Oscillators

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In order to start up, a feedback oscillator requires

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What is the total phase shift requirement, around the feedback loop, for a phase-shift oscillator?

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What is the relationship between the series and parallel resonant frequencies of a quartz crystal?

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At series resonance, the impedance of a crystal is

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At parallel resonance, the impedance of a crystal is

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What is the minimum frequency at which a crystal will oscillate?

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Calculate the fr of a lead-lag network if R1 = R2 = 6.8 kΩ, and C1 = C2 = 0.05 µF.

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A certain oscillator has a tap on the inductor in the tank circuit. This oscillator is probably

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An op-amp integrator has a square-wave input. The output should be

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A circuit that can change the frequency of oscillation with an application of a dc voltage is sometimes called

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Sinusoidal oscillators operate with _____ feedback.

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One condition for positive feedback is that the phase shift around the feedback loop must be _____°.

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The start-up gain of an oscillator must be _____ one.

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For frequencies up to 1 MHz, the _____ is the most widely used type of sinusoidal RC oscillator.

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The lead-lag circuit in the Wien-bridge oscillator has a resonant frequency at which the attenuation is

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The attenuation of the three-section RC feedback phase-shift oscillator is

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The twin-T oscillator produces a _____ response.

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The feedback signal in a(n) _____ oscillator is derived from a capacitive voltage divider in the LC circuit.

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The feedback signal in a(n) _____ oscillator is derived from an inductive voltage divider in the LC circuit.

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Oscillators
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