Chapter 6 Differential and Multistage Amplifiers3

# The second stage is differential in single ended o ut

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The second stage is differential-in, single-ended-o ut amplifier which consists of Q3 and Q4. The third stage is CE amplifier which consists of p np transistor Q7 to shifting the dc level. The last stage is the emitter follower. Biasing stage.

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Multistage Amplifier Equivalent circuit for calculating the gain of the input stage of the example. Input differential resistance Gain of first stage = = k r R id 2 . 20 2 1 π 4 . 22 ) //( 2 1 2 1 2 01 1 = + + = = e e i id r r R R R v v A

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Multistage Amplifier Equivalent circuit for calculating the gain of the second stage of the example. Gain of second stage 2 . 59 // 5 4 3 3 01 02 2 - = + - = = e e i r r R R v v A
Multistage Amplifier Equivalent circuit for calculating the gain of the third stage of the example. Gain of third stage 42 . 6 // 4 7 5 4 02 03 3 - = + - = = R r R R v v A e i

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Multistage Amplifier Equivalent circuit for calculating the gain of the output stage of the example. Gain of output stage Output resistance 998 . 0 6 8 6 03 0 4 = + - = = R r R v v A e [ ] = + + = 152 ) 1 ( // 5 8 6 β R r R R e o
Two-Stage CMOS Op-Amp Configurati on

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Homework: April 8th, 2008 6.87 6.121
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• Fall '10
• ChengJianping
• Transistor, Bipolar junction transistor, RO, Electronic amplifier, Widlar current source

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