Small-Size Low-Cost Wideband Continuous-Time Linear Passive Equalizer With an Embedded Cavity Structure on a High-Speed Digital Channel

Abstract

This paper proposes a wideband continuous-time passive equalizer with an embedded cavity structure that is more compact in size and enables lower-cost processing than conventional technologies. The proposed passive equalizer is composed of a lumped resistor and capacitance in a cavity structure generated by a parasitic channel parasitic component, such as a package ball pad. This equalizer design in which the capacitance is embedded in the cavity structure offers the advantages of reducing the additional occupied printed circuit board (PCB) area and of enabling a small-sized equalizer with a large capacitance for application in high-density systems. For a 40-cm transmission line on PCB with a data rate of 12.5 Gb/s, the measured eye diagram is successfully demonstrated and the eye opening significantly improved to 81.1 mV, with a timing jitter of 28.7 ps.