EE Times reproduces a quiz that originally appeared in EDN in 1976. This week, we cover questions 6-10 of the original printed article.
Last week, we presented the first five questions on data-acquisition from a ten-question quiz written by Fred Molinari and Aaron Fishman in 1976. Those questions focused on the analog side of a data-acquisition system. Questions 6-10 focus in the digital side. While the analog techniques in last week's quiz are still applicable today, these questions are certainly dated. For example, it's quite unlikely that you're designing data-acquisitions systems with 8080A or 6800 microprocessors.
Both quizzes refer to data-acquisition modules, which you're surely not using today. But, you might be developing a system using an IC A/D converter and you may still need to interface it to a processor. Of course, you might be using a µC that had an integrated A/D converter and it may even have enough memory for small jobs. Which µCs might you use today? ARM processors? If course, you may simply but a module that has the µC, A/D converter, memory, and computer interface all in one. Indeed, you might simply buy a USB digitizer module and connect it to a separate computer or to an embedded processor.
As with last week's quiz, the answers and original explanations appear on the last page.
Test your data-acquisition system IQ
6. If a given data-acquisition module has a throughput of 100,000 channels/sec, how can a greater throughput be attained?
- By lowering the resolution of the A/D.
- By Sampling the next channel during the conversion of the previous channel.
- By speeding up the A/D clock and lowering the sample period.
- All of the above.
One Data Translation's early modules.
To question 7