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 v o v fb A( s) Fre que ncy selec tive net wo rk, (s) function transfer loop closed s A s s A s A f ) ( ) ( 1 ) ( ) ( - = n oscillatio for condition s A s ) ( ) ( 1 =- criterion Barkhausen s A s 1 ) ( ) ( = 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 = + = ( 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 - +- - = + = To satisfy the Barkhausen criterion, At this frequency RC giving C R 3 1 3 1 2 2 2 = = =- ( 29 ( 29 ( 29 ( 29 8 ) 3 / 1 ( 3 3 / 3 / 1 3 / 1 ) ( ) (- =- + - = = A giving j j A s s A 1. Wein Bridge Oscillator Barkhausen criterion A(s)...
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EE3110-AEC-2008-Feedback Oscillator - EE3110: Analogue...

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