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lecture19annotat - 6.012 Microelectronic Devices and...

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6.012 - Microelectronic Devices and Circuits - Fall 2005 Lecture 19-1 Lecture 19 - Transistor Amplifiers (I) Common-Source Amplifier November 15, 2005 Contents : 1. Amplifier fundamentals 2. Common-source amplifier 3. Common-source amplifier with current-source supply Reading assignment: Howe and Sodini, Ch. 8, §§ 8.1-8.6 Announcements: Quiz 2: 11/16, 7:30-9:30 PM, open book, must bring calculator; lectures #10-18. Quiz 2 TA Review Session: 11/15, 7:30-9:30 PM,
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6.012 - Microelectronic Devices and Circuits - Fall 2005 Lecture 19-2 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?
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6.012 - Microelectronic Devices and Circuits - Fall 2005 Lecture 19-3 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.
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6.012 - Microelectronic Devices and Circuits - Fall 2005 Lecture 19-4 Signal could be represented by current or voltage four broad types of amplifiers: v s + R S R L v out R L R S v s + i out + voltage amplifier transconductance amplifier + v out R L R S i s transresistance amplifier R L R S i s i out current amplifier
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6.012 - Microelectronic Devices and Circuits - Fall 2005 Lecture 19-5 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]. Robust to process and temperature variations.
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