Lec_25_ESC102N_Operational

Lec_25_ESC102N_Operational - Lecture 25 5 Differential...

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9/23/2010 Lecture 25 1 Opamp as differential amplifier Box Black o v 1 v 2 v o v 2 2 1 v v + 2 2 1 v v - 2 2 1 v v - - 2 2 1 v v +
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9/23/2010 Lecture 25 2 Differential amplifier  o v icm v v v voltage input e Common = + = 2 mod 2 1 ) ( 2 1 v v - ) 2 ( 2 1 v v + id v v v voltage input e al Differenti = - = ) ( mod 2 1
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9/23/2010 Lecture 25 3 Differential amplifier Definitions c d c cm c oc d d d d o A A CMRR CMRR ratio rejection e Common A gain e Common v A v voltage output e Common A gain e al Differenti v A v voltage output e al Differenti = = = = = = mod mod mod mod mod
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9/23/2010 Lecture 25 4 Differential Opamp s c o s cm d s d o cm s d v A v v v v inputs polarity same For v A v v voltage Common v v voltage al Differenti inputs polarity opposite For = = = = = =
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Unformatted text preview: 9/23/2010 Lecture 25 5 Differential Opamp ) 1 1 ( ) 1 ( d cm d d o d cm d c d d o cm c d d o v v CMRR v A v v v A A v A v v A v A v general In + = + = + = 9/23/2010 Lecture 25 6 Differential amplifier 2 1 2 1 1 2 1 4 3 4 v R R v R R R R R R o v-+ + = 2 v o v A 1 R 1 v 3 R 2 R 4 R 9/23/2010 Lecture 25 7 Difference amplifier ) ( 2 1 1 2 3 4 1 2 v v R R v Gives R R R R Setting o-= =...
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