Am 08.05.2016 um 21:53 schrieb Attila Kinali:
True and not true. Yes, there are many ADCs that do high conversion
rates, but these are optimized for piplined applications where conversion
happens at a constant rate. Ie they expect a constant conversion clock
with a constant rate. If you want to trigger conversion at an arbitrary time,
you either have to build your own sampler or need to use one of the
non-pipelined ADCs whic are much slower (IIRC they stop around 5-10Msps
aka >100ns conversion time). Flash ADCs with direct access to the sampling
circuitry are basically extinct.
You can run the ADC on constant 100 MHz for example. The charged
capacitor has to wait an
extra 0 to 10 ns until it is read out. That is easy. In a time
stretcher you must keep the charge and
discharge it in a controlled way in 50 usec, and over that time, bias
currents etc really
do play a role.
regards, Gerhard
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