Lecture 4b- Other Combinational Logic

Lecture 4b- Other Combinational Logic - ELEC151 Spring 2011...

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ELEC151 Spring 2011 – L. Yobas Lecture 4b – 1 Lecture 4b Combinational Logic – Others ELEC151 Digital Circuits and Systems Spring 2011 Instructor: Levent Yobas
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ELEC151 Spring 2011 – L. Yobas Lecture 4b – 2 Lecture Overview Combinational circuits Transmission gates Tri-state buffer Reading Assignments: Chapter 10.8-10.9
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ELEC151 Spring 2011 – L. Yobas Lecture 4b – 3 CMOS transistor Transistor as a switch Two types of transistor PMOS and NMOS transistors 3-terminals transistor: Gate(G), Source(S) and Drain(D) PMOS transistor The transistor is on when a negative voltage is applied between the Gate and Source, equivalently we can say that the switch is on when a ‘0’ is applied to the gate NMOS transistor The transistor is on when a positive voltage is applied between the Gate and Source, equivalently we can say that the switch is on when a ‘1’ is applied to the gate G SD G G
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ELEC151 Spring 2011 – L. Yobas Lecture 4b – 4 CMOS Basic Building Blocks NOT, NAND and NOR gates Output is connected to VDD (logic 1) through PMOS or to GND (logic 0) through NMOS switches
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ELEC151 Spring 2011 – L. Yobas Lecture 4b – 5 Transmission Gate Transmission gate, TG (like a switch)
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Lecture 4b- Other Combinational Logic - ELEC151 Spring 2011...

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