5 - Recall: Input Resistance of CG Amp vo D ECSE 334...

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1 ECSE334 – Introduction to Microelectronics ECSE 334 Introduction to Microelectronics Roni Khazaka Lecture #5 ECSE334 – Introduction to Microelectronics 2 Khazaka - 2008 Recall: Input Resistance of CG Amp v o R s D G S R L ( ) mb m g g + 1 r o i i ro i i i v sig v i i i in i v R = () o mb m L o in r g g R r R + + + = 1 R in vo L o in A R r R + = vo L mb m in A R g g R + + 1 ECSE334 – Introduction to Microelectronics 3 Khazaka - 2008 Recall: Output Resistance of CG Amp v x D G S mb m g g + 1 r o i i x i R s x i i i x + v R out [] s o mb m o out R r g g r R + + + = 1 s vo o out R A r R + = ECSE334 – Introduction to Microelectronics 4 Khazaka - 2008 Impedance Transformation 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 ECSE334 – Introduction to Microelectronics 5 Khazaka - 2008 CG Amplifier Low impedance Î Sample the current like a good ammeter. High output impedance Î Good current source. Good Current Buffer ECSE334 – Introduction to Microelectronics 6 Khazaka - 2008 Common Gate Amplifier 3.3V 100 μ A V BIAS Q 1 Q 2 Q 3 v O + V SG - v sig 50 Ω 3.3V 2 mA/V 4 = = p ox p n ox n L W C L W C μ 8 . 0 = t V 20 = A V For all Transistors 2 . 0 = χ For Q 1 Neglecting V A , find the drain current of
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5 - Recall: Input Resistance of CG Amp vo D ECSE 334...

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