A 128-GS/s 63-GHz-bandwidth InP-HBT-based analog-MUX module for ultra-broadband D/A conversion subsystem

A 128-GS/s 63-GHz-bandwidth 2:1 analog-multiplexer (AMUX) module has been developed for ultrabroadband digital-to-analog (D/A) conversion subsystems. The AMUX IC was fabricated using 0.5-μm-emitter InP HBTs, which have a peak ft and fmax of 290 and 320 GHz, respectively. The IC has a through bandwidth of 67 GHz. We developed an ultra-low-loss metal package equipped with G3PO (SMPS) connectors. The AMUX module based on our new package has a through bandwidth of 63 GHz and operates at a sampling rate of up to 128 GS/s. We then constructed an over-50-GHz-bandwidth D/A conversion subsystem based on two 26-GHz-bandwidth sub-DACs and this AMUX module. In addition, we successfully demonstrated a 214-Gb/s discrete multi-tone (DMT) signal generation.