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Lecture 2b- Boolean (new)

# Lecture 2b- Boolean (new) - ELEC151 Spring 2011 L.Yobas...

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ELEC151 Spring 2011 – L. Yobas Lecture 2b – 1 Lecture 2b Logic Gates – Hardware Issues ELEC151 Digital Circuits and Systems Spring 2011 Instructor: Levent Yobas

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ELEC151 Spring 2011 – L. Yobas Lecture 2b – 2 Lecture Overview Inside logic gates TTL and CMOS logic Electrical characteristics: Signal levels, Noise margins, Fan-out, Speed Reading assignment: Chapter 10.1, 10.2,
ELEC151 Spring 2011 – L. Yobas Lecture 2b – 3 Logic Families Nowadays, most of the Integrated Circuits use CMOS logic, i.e. use both NMOS and PMOS transistors (This will be discussed later either in this course or in ELEC101/2) Detailed circuits may be more complicated to further reduce power & increase speed (e.g. ‘dynamic logic’) For different process, performance and power consumption, different VDD voltages can be used: 5V, 3.3V, 2.5V, 2.V, 1.8V… 1.2V, modern electronic use lower voltage Other integrated circuit technologies include TTL (Transistor-Transistor Logic), ECL (Emitter Coupled Logic) In the lab we will use TTL logic devices

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ELEC151 Spring 2011 – L. Yobas Lecture 2b – 4 Logic gates Boolean functions can be implemented by connecting logic gates together to form a circuit What’s inside a logic gates Logic gates are formed by using transistors and other components, e.g. resistor What is a transistor?
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Lecture 2b- Boolean (new) - ELEC151 Spring 2011 L.Yobas...

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