Electrical Engineering 145M - Spring 1996 - Derenzo - Midterm 1

Electrical Engineering 145M - Spring 1996 - Derenzo - Midterm 1

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Name (Last, First) UNIVERSITY OF CALIFORNIA College of Engineering Electrical Engineering and Computer Sciences Department EECS 145M: Microcomputer Interfacing Laboratory Spring Midterm #1 (Closed book- calculators OK) Wednesday, February 21, 1996 PROBLEM 1 (25 points) You have just tested an 8-bit D/A circuit by making measurements of its output glitches. Your measurements show that after all possible changes in input bit patterns at time t, the output glitch begins no earlier than t + 10 ns and is essentially gone after t + 30 ns. The output ranges from V 1 = 0 volts to V 255 = 2.55 volts. You decide to design and build a circuit that does the following: Uses the D/A converter, but suppresses output glitches by sensing changes in the input and using a sample and hold amplifier. Has accurate conversion at 0 Hz. You have available the following components: 1 A digital circuit that has 8 inputs and one output (normally low). If the input bits change at time t, the output goes high from (t + 5 ns) to (t + 5 ns + t d ). You can choose the value of t d . 2 A sample-and-hold amplifier with an analog input, and analog output, and a digital control line. When the control line is low, the analog output V 0 (t) is equal to the analog input V 1 (t). When the control line is made high at time t
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 11/21/2009.

Page1 / 6

Electrical Engineering 145M - Spring 1996 - Derenzo - Midterm 1

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online