Eight channels of analog information are being used by a computer to close eight control loops. Assume that all analog signals have identical frequency content and are multiplexed into a single ADC. The ADC requires 100 ?s per conversion. The closed-loop software requires 500 ?s of computation and output time for four of the loops, and for the other four it requires 250 ?s. What is the maximum frequency content that the analog signal can have according to the Nyquist criterion?
Known quantities:
The number of channels of an ADC, eight, the time required for ADC conversion, 100 ?s, the time required for computation and output time for four of the channels, 500 ?s, and for the other four, 250 ?s.
Find:
The number of bits required.
Analysis:
We assume a data acquisition system of the type shown in Figure 15.32. Therefore, each channel will be sampled at 1/8 of the external clock rate and the slowest channels will determine the rate.
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