8 - MOS Cascode IREF ECSE 334 Introduction to...

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1 ECSE334 – Introduction to Microelectronics ECSE 334 Introduction to Microelectronics Roni Khazaka Lecture #8 ECSE334 – Introduction to Microelectronics 2 Khazaka - 2008 MOS Cascode Q 2 v O v I Q 1 V BIAS I REF L R Common Gate Amp Common Source Amp Î Common Source followed by Common Gate ECSE334 – Introduction to Microelectronics 3 Khazaka - 2008 MOS Cascode: Input Resistance Q 2 v O v I Q 1 1 o r 1 o r = i R = i R L R Same as Common Source ECSE334 – Introduction to Microelectronics 4 Khazaka - 2008 MOS Cascode: Output Resistance D S L R s R s o m s vo o out R r g R A r R + = vo L mb m in A R g g R + + 1 () o m o mb m vo r g r g g A + + = 1 RECALL ECSE334 – Introduction to Microelectronics 5 Khazaka - 2008 MOS Cascode: Output Resistance Q 2 v O v I Q 1 1 o r 1 o r L R 1 1 o out r R = ? = out R ECSE334 – Introduction to Microelectronics 6 Khazaka - 2008 MOS Cascode: Output Resistance Q 2 v O 1 o r 1 o r L R ? = out R 1 2 2 o vo o out r A r R + = 1 2 2 o o m out r r g R 2 2 2 2 2 2 1 o m o mb m vo r g r g g A + + = 1 o o out r A R
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2 ECSE334 – Introduction to Microelectronics 7 Khazaka - 2008 MOS Cascode: Output Resistance Q 2 v O v I Q 1 1 o r 1 o r L R 1 1 o out r R = ? = out R v sig 0 = = sig i v v sig R 1 o o o out r A R R = Unilateral Amplifier NOTE: ECSE334 – Introduction to Microelectronics 8 Khazaka - 2008 Cascode: Open Circuit Gain Q 2 v i Q 1 1 o r 1 o r = i R 0 = 2 in R 0 i m v g 1 i m v g 1 i o o v A v 1 1 = o v i o i o m o v A v r g v 1 1 1 1 = = Intrinsic Gain of Q1 ECSE334 – Introduction to Microelectronics 9 Khazaka - 2008 Cascode: Open Circuit Gain Q 2 v i Q 1 1 o r 1 o r = i R 0 = 2 in R 0 i m v g 1 i m v g 1 i o o v A v 1 1 = 1 2 o vo o v A v = Open Circuit Voltage Gain of CG Stage () 2 2 2 2 2 2 2 1 o o m o mb m vo A r g r g g A = + + = Intrinsic Gain of Q2 02 2 A A vo ECSE334 – Introduction to Microelectronics 10 Khazaka - 2008 Cascode: Open Circuit Gain Q 2 v
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8 - MOS Cascode IREF ECSE 334 Introduction to...

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