Lec_31_ESC102N

Lec_31_ESC102N - Oscillators Devices that generate periodic...

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10/18/2010 Lecture 31 1 Oscillators wave Triangular wave Square wave Sine s Oscillator input external without wave periodic generate that Devices , -
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10/18/2010 Lecture 31 2 Oscillators β - = = A A v v A Gain Feedback s o f 1 o v f v s v f s v v + β A
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10/18/2010 Lecture 31 3 Oscillators n Oscillatio o goes Circuit absent is v if Even A A For A A v v A s f s o f int , 1 1 = = β β - = =
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10/18/2010 Lecture 31 4 Barkhausen Criterion frequency n oscillatio is which frequency certain at satisfied is criterion This Criterion Barkhausen called is or A A gain Loop ns Oscillatio sustained for Condition . 360 1 0 1 : 0 0 = θ β = β
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10/18/2010 Lecture 31 5 Phase Shift Oscillator o v F R 1 R R R R C C C network β P Oscillates Circuit A P at shift Phase , 1 360 180 180 0 0 0 = β = + = f v o v
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10/18/2010 Lecture 31 6 Phase Shift Oscillator real be to has X R X j X R R R v v network of R R v v A A c c c o F F f o f f β = θ - + - = β = β β - = = = β β 0 2 3 2 3 3 1 180 ) 6 ( 5 , 1
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10/18/2010 Lecture 31 7 Phase Shift Oscillator 29 29 1 5 , 1 / 6 1 6 0 6 1 2 3 3 2 3 = - = - = = = = = - R R X R R R A s rad RC R X X R X F c f c c c β β ϖ
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10/18/2010 Lecture 31 8 Wienbridge Oscillator o v F R 1 R 1 R 2 R 1 C 2 C f v P 2 Z 1 Z
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