MIT6_012s09_lec25

MIT6_012s09_lec25 - MIT OpenCourseWare http://ocw.mit.edu...

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Unformatted text preview: MIT OpenCourseWare http://ocw.mit.edu 6.012 Microelectronic Devices and Circuits Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms . 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 = = 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?...
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MIT6_012s09_lec25 - MIT OpenCourseWare http://ocw.mit.edu...

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