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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 Amplifier Design § A MOSFET amplifier 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 amplifier 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 λ ( ) 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 λ Lecture 20 – Slide 6 EE105, Fall 2013 Prof. Ming C. Wu
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