Download Homework 1 - the GMU ECE Department

Chapter 1 Homework Problems
Reading Assignment: Chapters 1 and 2 of course text
Due Date: 2/8/10
1. Compare hardware testing (final) to software testing.
2. For a given product, the test specification for a given input device is a maximum
leakage of 3.0mA when 2.5V. This is tested by forcing a given voltage and measuring
the resultant current. The tester to be used has the following accuracy:
forcing voltage +/-(0.1% +4mV+0.6mV/10mA),
measured current: +/-(0.2%+4uA+1uA/V) .
What forcing voltage and current limit should be set to ensure no bad product passes?
Where should it be set to ensure that no good product fails?
3. Repeat question 2, but assume that the 3.0mA spec is a minimum spec
4. In the pin electronics schematic in the class slides, the output comparator circuitry
contains two comparators, one for Voh (output high), and the other for Vol. During
functional testing, why are two comparators necessary (instead of just one)?