A power clamp for use in a manufacturing environment. The impedance of an output driver of the integrated circuit can be altered based on the process corner of the integrated circuit as fabricated. microwave, resonator, at least one coupling probe being positioned close to said gap, the method comprising the steps of applying an electromagnetic signal, monitoring the frequency response of the resonator through the probe, and analyzing the frequency response to provide a measure of movements, e. Acknowledgementnegative acknowledgement information is determined in accordance with the modulation symbol and the N spreading sequences. Also disclosed is a method for making a porous ceramic article is and includes: mixing inorganic batch ingredients including sources of silica, alumina, and lithia, with a liquid and an organic binder to form a plasticized batch mixture; forming a green body; and heating to the porous ceramic article, comprised of a major phase of beta-spodumene and a minor phase of mullite.