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MIT6_012s09_lec23

# MIT6_012s09_lec23 - MIT OpenCourseWare http/ocw.mit.edu...

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MIT OpenCourseWare http://ocw.mit.edu 6.012 Microelectronic Devices and Circuits Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .

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Lecture 23 Frequency Response of Amplifiers (III) OTHER AMPLIFIER STAGES Outline 1. Frequency Response of the Common-Drain Amplifier 2. Frequency Response of the Common-Gate Amplifier 6.012 Spring 2009 Lecture 23 1
1. Frequency Response of the Common-Drain Amplifier V DD signal source v s V BIAS v OUT i SUP R S R L + signal load 6.012 Spring 2009 Lecture 23 2 Voltage gain 1 High input resistance Low output resistance Good voltage buffer Characteristics of CD Amplifier: V SS -

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High-frequency small-signal model G S-B D Could use OTC to solve for bandwidth. To estimate bandwidth it is easier to use the 2-port models. 6.012 Spring 2009 Lecture 23 3
R R Low Frequency Analysis Using 2-Port Model Capacitors -open circuit A vo = in R S + R in (1) L R L + R out g m R L 1 + g

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