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
- Links to Primary Literature
- Additional Readings
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
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Its dedicated editorial team is led by Sagan Award winner John Rennie. Contributors include more than 9000 highly qualified scientists and 42 Nobel Prize winners.
MORE THAN 8500 articles and Research Reviews covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 17,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information