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Jon Elmer edited Bath Power System.tex
over 9 years ago
Commit id: 0812506fb5e1629e04da34eed19f4d0f7a17fd55
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Flash ADCs use a sequence of comparators and logic gates to facilitate an extremely fast conversion. Hhowever, the number of output bits, the number of logic gates and comparators needed increases exponentially because one comparator is needed for each discrete value. Therefore the cost implications of flash ADCs of >8bits are prohibitive for many applications.
Successive approximation ADCs
use utilise a comparator coupled with a digital-to-analogue converter to
get a gradually more make increasingly accurate digital
value. Successive approximation ADCs take values over a
different amount series of
time to arrive at a digital value depending upon how many successive steps attempts. Because more attempts are
taken needed to
reach the correct convert different analogue
value. voltages, the conversion duration is not fixed. These ADCs can be produced with much higher resolution,
but at
lower the detriment of sample
rates. rate.
Sub-ranging ADCs
use are a hybrid of flash and successive
approximation techniques to find the most approximtion ADCs. The more significant
bit values, bits are determined by a successive approximation technique, and
the lower bits converted by a flash
ADC to find technique. This gives the
least significant bits. ADCs some of the speed of an all-flash ADC, whilst retaining the resolution of successive approcimation ADCs
This allows sub-ranging ADCs to perform faster than successive approximation ADCs, but slower than flash ADCs. The ability to obtain the most significant bits by successive approximation allows these ADCs to have high resolution, without the vastly increased cost of purely flash ADCs.