Marina Santo Zarnik, Franc Novak, Srecko Macek.
Oscillation test structures of active RC filters,
Proc. IEE Colloquium on Testing mixed signal circuits and systems, London, 23 October 1997, pp. 4/1-4/6.

Design-for-test modifications of different types of active RC filter stages for the oscillation-based testing are proposed. Additional switches or a feedback loop network are employed. The first solution offers the possibility of a simple built-in test implementation while the second is more applicable to the use of an external tester.