EE3110-AEC-2008-Feedback Oscillator

# EE3110-AEC-2008-Feedback Oscillator - EE3110 Analogue...

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Unformatted text preview: EE3110: Analogue Electronic Circuits Oscillators 3. Oscillators 1. Feedback Concepts Total phase shift through the amplifier and feedback network = N × 360 o . Magnitude of loop gain must be unity Rashid: ch11 Boylestad: ch14 v i v ε v o v fb A( s) Fre que ncy selec tive net wo rk, β (s) function transfer loop closed s A s s A s A f ) ( ) ( 1 ) ( ) ( β- = n oscillatio for condition s A s ) ( ) ( 1 =- β criterion Barkhausen s A s 1 ) ( ) ( = β 1. Phase Shift Oscillator Assuming all RC networks are identical and A 1 = A 2 = 1, Let A 3 = A(s) = A A 1 v i v 1 v 1 v 2 v 2 v 3 v o A 2 A 3 network RC first of function transfer v sRC sRC v i × + = 1 1 function transfer feedback s sRC sRC v v i ) ( 1 3 3 β = + = ( 29 ( 29 ( 29 ( 29 2 2 2 2 2 2 2 3 3 3 1 1 ) ( ) ( C R RC j C R RC RC j A sRC sRC A s s A ϖ ϖ ϖ ϖ ϖ β- +- ×- = + × = To satisfy the Barkhausen criterion, At this frequency RC giving C R 3 1 3 1 2 2 2 = = =- ϖ ϖ ϖ ( 29 ( 29 ( 29 ( 29 8 ) 3 / 1 ( 3 3 / 3 / 1 3 / 1 ) ( ) (- =- + ×- = = A giving j j A s s A β 1. Wein Bridge Oscillator Barkhausen criterion A(s) β...
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EE3110-AEC-2008-Feedback Oscillator - EE3110 Analogue...

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