Transcription of Lecture 20 - MIT
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Lecture 20 - MIT
Spring 20071 Lecture 20 Transistor Amplifiers (II)Other Amplifier StagesOutline Common-drain amplifier Common-gate amplifierReading Assignment:Howe and Sodini; Chapter 8, Sections Spring 200721. Common-drain amplifier A voltage buffer takes the input voltage which may have a relatively large Thevenin resistance and replicates the voltage at the output port, which has a low output resistance Input signal is applied to the gate output is taken from the source To first order, voltage gain 1 Input resistance is high output resistance is low Effective voltage bufferstage vgate iDcannot change vsource Source followerHow does it work?
• A voltage buffer takes the input voltage which may have a relatively large Thevenin resistance and replicates the voltage at the output port, which has a low output resistance • Input signal is applied to the gate • Output is taken from the source • To first order, voltage gain ≈1 • Input resistance is high • Output resistance ...
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