Lecture 20

Lecture 20 - Lecture 20 Review of MOSFET Amplifiers MOSFET...

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1 Lecture 20 – Slide 1 EE105, Fall 2013 Prof. Ming C. Wu Lecture 20 § Review of MOSFET Amplifiers § MOSFET Cascode Stage § MOSFET Current Mirror § Reading: Chap. 9 Lecture 20 – Slide 2 EE105, Fall 2013 Prof. Ming C. Wu Review:’MOSFET’Amplifer’Design’ § A’MOSFET’amplifer’circuit’should’be’designed’to’ 1. ensure that the MOSFET operates in the satura5on region, 2. allow the desired level of DC current to flow, and 3. couple to a small-signal input source and to an output load . à Proper’ DC’biasing ’is’required!’ (DC analysis using large-signal MOSFET model) § Key’amplifer’parameters:’ (AC analysis using small-signal MOSFET model) Voltage’gain’ A v’ v out / v in Input’resistance’ R in resistance seen between the input node and ground (with output terminal floa5ng) Output’resistance’ R out resistance seen between the output node and ground (with input terminal grounded)
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2 Lecture 20 – Slide 3 EE105, Fall 2013 Prof. Ming C. Wu MOSFET’Models’ § The’large-signal’model’is’used’to’determine’the’DC’ operaIng’point’( V GS ,’ V DS ,’ I D )’of’the’MOSFET.’ § The’small-signal’model’is’used’to’determine’how’the output’responds’to’an’input’signal.’ Lecture 20 – Slide 4 EE105, Fall 2013 Prof. Ming C. Wu Common’Source’Stage’ D out in S m D G v R R R R R R g R R R R R R A = = + + = 2 1 2 1 2 1 || 1 0 = λ 0 ( ) S O m O D out R r g r R R +
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3 Lecture 20 – Slide 5 EE105, Fall 2013 Prof. Ming C. Wu Common’Gate’Stage’ ( ) ( ) D m G m S m S v R g R g R g R A + = / 1 || / 1 S m in R g R 1 D out R R = ( ) S O m O D out R r g r R R + 0 = λ 0 Lecture 20 – Slide 6 EE105, Fall 2013 Prof. Ming C. Wu Source’Follower’ S m
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Lecture 20 - Lecture 20 Review of MOSFET Amplifiers MOSFET...

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