7 - Common Source Amplifier CS Amplifier ECSE 334...

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1 ECSE334 – Introduction to Microelectronics ECSE 334 Introduction to Microelectronics Roni Khazaka Lecture #7 ECSE334 – Introduction to Microelectronics 2 Khazaka - 2008 Common Source Amplifier Q CS Amplifier sig v L R i v o v s R L C ECSE334 – Introduction to Microelectronics 3 Khazaka - 2008 High Frequency Equivalent CKT of CS Amp ECSE334 – Introduction to Microelectronics 4 Khazaka - 2008 Analysis Using Miller Theorem R s and C L small Can use Miller Theorem Miller Capacitance Ignore 2 nd Miller Cap Ignore C L (small) ECSE334 – Introduction to Microelectronics 5 Khazaka - 2008 Analysis Using Miller Theorem sig in H R C f π 2 1 = () L m gd gs in R g C C C + + = 1 Miller Capacitance Causes low frequency pole Large Gain ECSE334 – Introduction to Microelectronics 6 Khazaka - 2008 Analysis Using Open Circuit time Constants
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2 ECSE334 – Introduction to Microelectronics 7 Khazaka - 2008 Resistance Seen By C L L o L CL R r R R = = || Resistance seen by C L ECSE334 – Introduction to Microelectronics 8 Khazaka - 2008 Resistance Seen by C gs sig gs R R = Resistance seen by C gs ECSE334 – Introduction to Microelectronics 9 Khazaka - 2008 Resistance Seen by C gs () L L m sig gd R R g R R + + = 1 Resistance seen by C gd ECSE334 – Introduction to Microelectronics 10 Khazaka - 2008 Analysis using Open Circuit Time Constants CL L gd gd gs gs H R C R C R C + + = τ [ ] L L L L m sig gd sig gs H R C R R g R C R C + + + + = 1 H H f πτ 2 1 = This analysis does not ignore C L
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7 - Common Source Amplifier CS Amplifier ECSE 334...

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