0.8-5.2 GHz band SiGe-MMIC Q-MIX for a multi-band multi-mode direct conversion receiver

By employing a 14 GHz static frequency divider and broadband SiGe-HBT unit mixers, a 0.8-5.2 GHz band Q-MIX is developed using a 0.35 /spl mu/m SiGe BiCMOS process. The fabricated Q-MIX has constant conversion gain (Gc) over the wide baseband (BB) frequency range up to 100 MHz and performs good I/Q balance (<0.17 dB, <3.6 degrees) over the wide RF frequency range of 0.8-5.2 GHz.