October 2006
Intermediate to advanced
544 pages
20h 23m
English
Content preview from Digital Systems: Principles and Design
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496
Digital Systems
6. A DAC glitch is understood by the following example. Let us consider that the input
to a DAC suddenly falls from 127
D
to 63
D
. Let resolution is 10 mV/bit. If DAC is of
high speed and is of resolution 10 mV, then the output may first drop from 1.27 V to
0 V and then eventually settle at 630 mV. Appearance of false output signal is called
a glitch.
There is a type of DAC called ladder network based DAC. Example 20.14 will explain
R-2R based DAC.
20.3 ANALOG/DIGITAL SWITCH
Recall that an enhancement mode n-channel MOSFET shows the characteristics as follows:
When voltage between gate and source, V
GS
= 0, the current I
D
between the ...
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