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Oscillator Circuits

1 Oscillator Circuits2II. Oscillator OperationFor self-sustaining oscillations: the feedback signal must positive the overall gain must be equal to one (unity gain)3If the feedback signal is not positive or the gain is less than one, then the oscillations will dampen the overall gain is greater than one, then the Oscillator will eventually of Oscillator Bridge Oscillator Oscillator5A. Phase-Shift OscillatorFrequency of the Oscillator : (the frequency where the phase shift is 180 )Feedback gain = 1/[1 5 2 j (6 3) ]where = 1/(2 fRC)Feedback gain at the frequency of the Oscillator = 1 / 29 The amplifier must supply enough gain to compensate for losses. The overall gain must be unity. Thus the gain of the amplifier stage must be greater than 1/ , A > 29 The RC networks provide the necessary phase shift for a positive feedback.

Transistor Colpitts oscillator. 15 Op-amp Colpitts oscillator. 16 Hartley Tuned Oscillator Circuit FET Hartley Oscillator, where 1 2 2 12 2 1 0 L L L L π L C f eq eq Frequency of oscillations: = = + + 17 BJT based Hartley Oscillator. 18 D. Crystal Oscillators

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sites.science.oregonstate.edu

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sites.science.oregonstate.edu

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www.nxp.com

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bgaudioclub.org

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ee.cet.ac.in

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www.seas.ucla.edu

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staff.utar.edu.my

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sites.ntc.doe.gov

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