Tuesday, July 17, 2007

Data Acquisition Block Diagram

The data acquisition of a band-limited signal has the following broad steps:

  1. DC removal

  2. 2-bit ADC (0.5 MHz speed)

  3. Collect 4 such samples at one time (for simplicity, copy the same signals 4 times)

  4. Build a sampler, of 0.5 MHz.

  5. One could take 10 MHz signal, and use every 20th pulse (simple counter) for sampling.

  6. Put together four 2-bit samples on a bus with an isolator for i/o.

  7. Feed the signal to the data acquisition card sitting in the PCI slot of a PC.

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