Agere Systems Guardian Corp.

Thomas L Shewell

Thomas Francis Strelchun

David Loren Anderson

Naresh Gupta

Intermittent miscounts generated by counters used in a phase-locked loop (&ldquo;PLL&rdquo;) are precisely measured by detecting changes to a predetermined waveform, such as a sawtooth waveform. The miscounts are detected using an open loop, not closed loop, set-up which comprises two separate signal generators feeding two separate frequencies into MAIN and REF counters of a PLL. Offsetting the frequencies slightly and integrating an output generates the predetermined waveform. Thereafter, miscounts can be detected by comparing waveforms corresponding to miscounts to theoretically predicted, predetermined waveforms.

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Oley, PA, United States of America

Thomas L Shewell