Lecture_3 - ECE 331 Digital System Design CMOS Circuit...

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ECE 331 – Digital System Design CMOS Circuit Design of Logic Gates
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ECE 331 - Digital System Design 2 Switching Circuits Also known as Combinational Logic Circuits - Combination of logic gates Circuit design from - Truth Table - Boolean Expression Circuit realized using - Interconnection of discrete components - Synthesis from a Hardware Description Language
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ECE 331 - Digital System Design 3 Logic value 1 Undefined Logic value 0 Voltage V DD V 1,min V 0,max V SS (Gnd) Voltage Levels in Logic Circuits
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ECE 331 - Digital System Design 4 TTL Technology TTL = Transistor-transistor Logic Dominant technology prior to the emergence of CMOS technology. Not as suitable for large-scale integration as CMOS technology. Largely obsolete for new designs. - Good for labs and educational use because it is more robust than CMOS.
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ECE 331 - Digital System Design 5 TTL Technology Bipolar Junction Transistor (BJT) - Base – analogous to gate in CMOS - Collector – analogous to drain in CMOS - Emitter – analogous to source in CMOS npn BJT - Collector, Emitter: n-type semiconductor - Base: p-type semiconductor pnp BJT - Collector, Emitter: p-type semiconductor - Base: n-type semiconductor
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ECE 331 - Digital System Design 6 MOS Technology CMOS - Complementary Metal Oxide Semiconductor NMOS - N-channel MOSFET PMOS - P-channel MOSFET MOSFET - Metal Oxide Semiconductor Field Effect Transistor
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ECE 331 - Digital System Design 7 Drain Source x = "low" x = "high" (a) A simple switch controlled by the input
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This note was uploaded on 01/24/2011 for the course ECE 331 taught by Professor Staff during the Spring '08 term at George Mason.

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Lecture_3 - ECE 331 Digital System Design CMOS Circuit...

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