# TAMU ECEN 215 - Lec23 (8 pages)

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# Lec23

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## Lec23

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Pages:
8
School:
Texas A&M University
Course:
Ecen 215 - Prin Of Electrical Engr
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ECEN 215 Principles of Electrical Engineering Dr Mina Rahimian Lecture Full wave rectifier circuits 23 Date 11 18 13 Clipper circuits Diodes can be used to make clipper circuits in which a portion of the input voltage is clipped off For example if it is required to have an output voltage between 9v and 6v a clipper circuit can be used to clipp off the voltages above 6 and below 9 volts In the previous clipper circuit since the batteries need periodic replacement it is more practical to use zener diodes instead of batteries and regular diodes Ex Sketch the output voltage Ex Sketch i versus v for 10 v 10 Chapter 7 Logic Circuits Digital computers have taken a prominent place in engineering and science over the last decades The objective of this chapter is to discuss the essential features of digital logic circuits which are the heart of digital computers In this chapter we will discuss the binary numbers boolean algebra logic gates and designing simple combinational logic circuits Analog and digital signals Analog signal is a continuous signal and can take any value For example the output of sensors are voltages proportional to the physical measurements at the input Digital signals can take only a few restricted ranges Most common digital signals are in binary form which takes only two ranges The first range represents a logic 0 and the second range represents logic 1 For example for a popular type of logic circuits known as transistor to transistor logic TTL 2 4v 5v is considered a logic 1 also called high on or true 0v 0 4v is considered logic 0 also called low off or false bit and byte A single binary digit is called a bit A byte is a word consisting of 8 bits Each bit contains 0 or 1 representing some information For example if bit A represents presure 0 means low and 1 means high pressure bit B represents light intensity 0 means dark 1 means light bit C represents temperature 0 means cold 1 means hot then ABC 100 indicates high pressure dark and cold condition

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