Sampled-data control system
Hintz, Kenneth J. Department of Electrical and Computer Engineering, George Mason University, Fairfax, Virginia.
- Analog-to-digital converter
- Digital-to-analog converter
- Digital compensator
- Related Primary Literature
- Additional Reading
A type of digital control system in which one or more of the input or output signals is a continuous, or analog, signal that has been sampled. There are two aspects of a sampled signal: sampling in time and quantization in amplitude. Sampling refers to the process of converting an analog signal from a continuously valued range of amplitude values to one of a finite set of possible numerical values. This sampling typically occurs at a regular sampling rate, but for some applications the sampling may be aperiodic or random. The sampling process consists of an ideal switch which passes the time-varying analog signal (Fig. 1a) to a hold device which stores the instantaneous analog amplitude of the signal while it is converted to a binary number. The ideal sampler allows the signal to pass to the hold device at regular intervals for a very short period of time. The effective sampling signal is thus a series of delta functions (Fig. 1b). The resulting sampled signal (Fig. 1c) has the appearance of a pulse-amplitude-modulated signal and, for theoretical analysis, is often considered to be the product of a sequence of Kronecker delta functions with the original analog signal. See also: Pulse modulation
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