October 2006
Intermediate to advanced
544 pages
20h 23m
English
Content preview from Digital Systems: Principles and Design
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500
Digital Systems
FIGURE 20.8 Voltage output as function of voltage input in CMOS and TTL gates.
EXAMPLES
A doctor needs to measure the patient temperature within 37°C to 40°C with resolution of
1°C, how many bits ADC is needed. .
Solution
Since only four readings are required, therefore output = 00, 01, 10 and 11 corresponding to
37, 38, 39 and 40°C patient temperature should suffice. A two bits ADC suffices.
A furnace temperature is within 1000°C to 1600°C with resolution of 1°C, how many bits
ADC is needed.
Solution
Since 601 readings are required between within 1000°C to 1600°C, therefore 10 bit ADC as
needed, because 2
10
= 1024. Nine bit ADC will ...
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