MIT6_012S09_lec25

MIT6_012S09_lec25 - Lecture 25 Multistage Amplifiers(II DC VOLTAGE AND CURRENT SOURCES Outline 1 DC Voltage Sources 2 DC Current Sources and Sinks

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Unformatted text preview: Lecture 25 Multistage Amplifiers (II) DC VOLTAGE AND CURRENT SOURCES Outline 1. DC Voltage Sources 2. DC Current Sources and Sinks 6.012 Spring 2009 Lecture 25 1 Reading Assignment: Howe and Sodini, Chapter 9, Sections 9-3-9.4 Final: Monday, May 19, 2009, 9am, Johnson Ice Rink 1. DC Voltage Sources Characteristics of DC Voltage Sources : • A well controlled output voltage • Output voltage does not depend on current drawn from source ⇒ Low Thevenin Resistance Consider a MOSFET connected in “diode configuration” I-V characteristics: ( ) ( ) 2 2 2 2 Tn DS ox n Tn GS ox n D V V C L W V V C L W I − = − = μ μ Beyond the threshold voltage, the MOSFET looks like a “diode” with quadratic I-V characteristics 6.012 Spring 2009 Lecture 25 2 How does one synthesize a voltage source with this? Assume a current source is available V GS = V DS takes a value needed to sink current i D = I REF + i OUT = W 2 L μ n C ox v OUT − V Tn ( ) 2 Then: i OUT = W 2 L μ n C ox v OUT − V Tn ( ) 2 − I REF Solving...
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This note was uploaded on 11/07/2011 for the course COMPUTERSC 6.012 taught by Professor Charlesg.sodini during the Spring '09 term at MIT.

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MIT6_012S09_lec25 - Lecture 25 Multistage Amplifiers(II DC VOLTAGE AND CURRENT SOURCES Outline 1 DC Voltage Sources 2 DC Current Sources and Sinks

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