Low Cost Wideband Continuous-Time Linear Equalizers (CTLE) based on SiGe BiCMOS Phase Change Material (PCM) Switches

This work introduces passive and active wideband continuous-time linear equalizers (CTLEs) operating up to 110 GHz. These designs are realized using Tower Semi phase-change material (PCM) technology in a SiGe BiCMOS process. The passive design achieves a 16.4 dB equalization level while consuming no static power. The active design provides a maximum DC gain of 16.5 dB and around 19 dB of low frequency de-emphasis. Modulated measurements confirm the operation of both designs at 120 GBd without transmitter pre-distortion and scope equalization. These designs leverage the high-performance characteristics of an advanced SiGe process with PCM switches and are targeted for 200 GBd wireline communication systems.