Lecture 35 Part 3 SynthesisExOR_1

Lecture 35 Part 3 SynthesisExOR_1 - Output exists only if B...

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EE 311 Lecture 35 Part 3 Wednesday April 7, 2010 10.3 Synthesis of Exclusive-Or Y = A*B + A*B Zubair Rehman
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2 To synthesize the PDN, determine Y DeMorgan’s Law Exclusive-Or: Y = A B + A B Y = A B + A B = A B * A B Y = (A + B) * (A + B) = (A + B) * (A + B) Y = A A + A B + B A + B B A A = 0 B B = 0 Y = A B + A B Synthesis of PDN 1. A*B is in parallel with A*B 1. A is in series with B 3. A is in series with B B A B A = + B A AB + =
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3 PUN is Dual of PDN Parallel Series Series Parallel Inputs Do Not Change Alternative Circuit For Exclusive-Or Y = A B + A B Y = A B + A B
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4 PUN is Dual of PDN Parallel Series Series Parallel Inputs Do Not Change Alternative Circuit For Exclusive-Or Y = A B + A B Y = A B + A B Comments on PUN If A is Low, A inverse is High. If B is Low, B inverse is High. Suppose A is Low, then the path to
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Unformatted text preview: Output exists only if B inverse is Low. Suppose B is Low, then the path to Output exists only is A inverse is Low. Can draw an alternate PUN A in Series with B inverse In Parallel with B in Series with A inverse. 5 Alternative Circuit For Exclusive-Or Y = A B + A B Y = A B + A B Synthesize the PUN from Y 1. A*B is in parallel with A*B 2. A is in series with B 3. A is in series with B 6 Exclusive-OR Y = AB +AB A B A’ B’ N1 N2 N3 N4 P1 P2 P3 P4 Y L L H H OFF OFF ON ON OFF ON ON OFF Low H L L H ON OFF OFF ON ON ON OFF OFF High L H H L OFF ON ON OFF OFF OFF ON ON High H H L L ON ON OFF OFF ON OFF OFF ON Low Figure 10.15 PUN obtained By Synthesis PDN is not Dual of PUN But Was Obtained By Synthesis...
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Lecture 35 Part 3 SynthesisExOR_1 - Output exists only if B...

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