Issue No.05 - May (1970 vol.19)
M.C. Gilliland , Computer Research, Inc.
The author develops a method for finding stability contours which provide a means for analyzing "in the large" stability characteristics of hybrid loops including the effects of sampling, delay, and various types of hold circuits. The method provides a meaningful tool for comparing the results of different methods of digital and analog compensation.
M.C. Gilliland, "R70-7 Stability Controls for the Analysis of Analog/Digital Hybrid Loops", IEEE Transactions on Computers, vol.19, no. 5, pp. 465, May 1970, doi:10.1109/T-C.1970.222958