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Lect2UP150_(100325)

Lect2UP150_(100325) - Lecture 150 Resistor Implementations...

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Lecture 150 – Resistor Implementations and Current Sinks and Sources (3/25/10) Page 150-1 CMOS Analog Circuit Design © P.E. Allen - 201 LECTURE 150 – RESISTOR IMPLEMENTATIONS AND CURRENT SINKS AND SOURCES LECTURE ORGANIZATION Outline • Resistor implementations • Simple current sinks and sources • Improved performance current sinks and sources • Summary CMOS Analog Circuit Design, 2 nd Edition Reference Pages 126-134 Lecture 150 – Resistor Implementations and Current Sinks and Sources (3/25/10) Page 150-2 CMOS Analog Circuit Design © P.E. Allen - 201 RESISTOR IMPLEMENTATION USING MOSFETS Real Resistors versus MOSFET Resistors • Smaller in area than actual resistors • Can pass a large current through a large resistance without a large voltage drop 060526-10 i D v DS 100μA 1V MOSFET ( r ds = 100k Ω ) 100k Ω Resistor 10μA 10V AC resistance = v ds i d = 1 g ds where g ds ± ² 2 ( V GS - V T ) 2 ³ = I D ³
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