lec19 - 6.012 Microelectronic Devices and Circuits Fall...

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Unformatted text preview: 6.012 Microelectronic Devices and Circuits Fall 2005 Lecture 191 Lecture 19 Transistor Amplifiers (I) CommonSource Amplifier November 15, 2005 Contents : 1. Amplifier fundamentals 2. Commonsource amplifier 3. Commonsource amplifier with currentsource supply Reading assignment: Howe and Sodini, Ch. 8, 8.18.6 Announcements: Quiz 2: 11/16, 7:309:30 PM, open book, must bring calculator; lectures #1018. Quiz 2 TA Review Session: 11/15, 7:309:30 PM, 6.012 Microelectronic Devices and Circuits Fall 2005 Lecture 192 Key questions What are the key figures of merit of an amplifier? How can one make a voltage amplifier with a single MOSFET and a resistor? How can this amplifier be improved? 6.012 Microelectronic Devices and Circuits Fall 2005 Lecture 193 1. Amplifier fundamentals Goal of amplifiers: signal amplification . +V -V v IN v OUT + + -- v IN v OUT input signal output signal R L Features of amplifier: Output signal is faithful replica of input signal but amplified in magnitude. Active device is at the heart of amplifier. Need linear transfer characteristics for distortion not to be introduced. 6.012 Microelectronic Devices and Circuits Fall 2005 Lecture 194 Signal could be represented by current or voltage four broad types of amplifiers: v s + R S R L v out + voltage amplifier R L R S v s i out + transconductance amplifier + v out R L R S i s transresistance amplifier R L R S i s i out current amplifier 6.012 Microelectronic Devices and Circuits Fall 2005 Lecture 195 More realistic transfer characteristics: v IN v OUT input signal output signal Q Transfer characteristics linear over limited range of voltages: amplifier saturation . Amplifier saturation limits signal swing . Signal swing also depends on choice of bias point , Q (also called quiescent point or operating point ). Other features desired in amplifiers: Low power consumption . Wide frequency response [will discuss in a few days]....
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This note was uploaded on 07/20/2009 for the course ELECTRICAL 6.012 taught by Professor Prof.jesúsdelalamo during the Fall '05 term at MIT.

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lec19 - 6.012 Microelectronic Devices and Circuits Fall...

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