Marina Santo Zarnik, Franc Novak, Srecko Macek.<br>
<a href="ftp://martin.ijs.muzej.si/pub/CSD/Reports/CSD-TR-97-5.ps.gz">
Oscillation test structures of active RC filters, </a><br>
<i>Proc. IEE Colloquium on Testing mixed signal circuits and systems</i>,
London, 23 October 1997, pp. 4/1-4/6. <p>

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.