Errata: In Exercise 4.12, some additional assumptions are required for oscillation
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Location: page 129, line 6
As written, some additional assumptions of the values of the resistances and capacitances are needed in order to obtain an oscillation. For a simple fix, change the last line of the exercise to read
A better solution is to modify the exercise to read as follows:
An op amp circuit for an oscillator was shown in Exercise 3.5. The oscillatory solution for that linear circuit was stable but not asymptotically stable. A schematic of a modified circuit that has nonlinear elements is shown in the figure below (omitted; see text).
(Contributed by K. J. Astrom, 8 Mar 2011)