On 4/7/06, Dieter <[EMAIL PROTECTED]> wrote:
All is not lost. Although complexity goes up rapidly.
Grumble. I'd like a scope and spectrum analyser that goes up to at least 700 MHz.
If 1Ghz ADC is the limit, even a perfect low pass filter from the
Ideal Physics Company only gets us to 500 Mhz.
All is not lost. Although complexity goes up rapidly.
I'm afraid I don't follow you. What does ganging 2 or more ADCs together
achieve? Multiple inputs? Faster sample rate?
Basically what needs to be done is a signal needs to be broken up into multiple lower frequency signals. One of the normal methods is to use interlieved sampling. This would consist of multiple sampling heads that are attached to a common input signal. Each head would have a fast sampling bridge and an ADC. You could then operate the sampling heads at a specific frequency but delayed from one another so each samples a different point on the waveform. There are other methods such as using multiple tapped filters to break a signal into lower bandwidth signals.
This is all very black magic. Most of the information is internal to Tek, Lecroy and Agilent. Also in order to keep parasitics down sampling heads etc need to be made tiny. This also doesn't include the complexity of making a pulser capable of produsing perfectly edged pulses fast enough to drive the sampling head.
A 1 Ghz scope might be doable. But I can see it being several hundred in parts alone.
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