Practicals & Theses

List of practicals and theses at the Embedded Computing Systems Group (E191/2)

Details for Experimental measurement of Schmitt Trigger Metastability

Rather than assuming a stable HI or LO, digital storage elements can, under adverse conditions, also assume a so-called metastable state for some time. This undefined state creates problems in the subsequent logic. Quite unexpectedly, Schmitt Trigger circuits can also become metastable, even though their purpose is not data storage.


The primary aim of this diploma thesis is to create an experimental evidence for the Schmitt trigger metastability. To this end, a suitable Schmitt Trigger shall be selected (FPGA input, discrete component,...) and equipped with a measurement infrastructure. Here, an existing infrastructure can be used as starting point and adapted as required. The result will be a characterization of the Schmitt Trigger metastability (most notably its threshold values and its resolution constant tau) along with a comparison against theoretical and simulation results.

Required Skills

VO Digital Design, LU Digital Dessign & Computer Architecture


Dipl.-Ing. Dr.techn. Andreas STEININGER (main responsibility)


Praktikum, Diplomarbeit