The use of conventional analog controllers to produce a one- quarter -decay transient response in sampled output control systems is studied. In particular, the control of processes which can be adequately represented by a first order lag plus deadtime is analyzed, where the process deadtime does not exceed the sampling interval. The process output is measured by a sample-and-hold device, which introduces additional deadtime equal to the sampling interval. This extends previous work, which considered only the plant delay. Proportional and proportional- integral (two-mode) controllers are studied. Controller settings yielding a one-quarter-decay transient response are calculated using z-transform theory. Plant simulations on a digital computer verify the predicted results. Comparisons are then made with results found by earlier authors studying continuous systems and sampled systems with no feedback deadtime.

Library of Congress Subject Headings

Feedback control systems; Electronic digital computers

Publication Date


Document Type


Department, Program, or Center

Microelectronic Engineering (KGCOE)


Brown, George


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