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Homework 5v2 - A/D converter with the Flash-type...

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EE40 Summer 2011 Neel Shah Homework 5 Due 8/5/2011 Problem 0. iClicker Serial Number The friendly folks at iClicker decided to wipe out all class databases. Rather than trust them again with your iClicker information I’d prefer to take your serial numbers here. Please submit this information with your assignment. Problem 1. Logic Blocks While several logical operations (AND, OR, NOT, NAND, NOR, XOR, XNOR) exist, some are complicated to build in a given technology. All of these logical functions can be accomplished using only NAND gates or only NOR gates. a) Construct NAND, NOR, and XNOR gates for 2 inputs using only 2-input NAND gates. Draw neatly and clearly your schematics for full credit, or use a schematic editor like Eagle or LTSpice. b) Repeat (a) with NOR. c) How would you construct AND/OR/XOR gates in each case? Problem 2. Priority Encoder for A/D We saw earlier in the semester a simple A/D converter with the Flash-type
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Unformatted text preview: A/D converter with the Flash-type architecture. It relied on 7 comparators followed by an encoder to convert 8 states into 3 bits. Your job here is to design this encoder. a) Write the truth table that lists the 8 possible states for g G − g ± and the 3-bit output that it corresponds to. The 3-bit outputs should represent the numbers 0-7, and they should correspond to analog voltages from 0 ² to ²³³ ∙ 7/8 . b) Write simplified logical expressions for each 3-bit digital output ´ µ − ´ ¶ in terms of the seven input signals g G − g ± . c) Implement your logic by drawing a digital circuit, using the correct symbols for the logic gates. Draw neatly and clearly for full credit, or use LTSpice or Eagle to draw your schematic. Problem 3. Agarwal and Lang, Problem 5.14. (b) is a stuck-at-0 fault (typo in the book). Problem 4. Agarwal and Lang, Problem 7.2....
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