Bo Woo Kim

A 1-6 GHz monolithic up-conversion mixer with input/output active baluns using SiGe HBT process

In this paper, a 1-6 GHz MMIC up-conversion mixer, for an RF transmitter, is designed and fabricated using 0.8 /spl mu/m SiGe HBT process technology. This mixer is implemented on-chip using LO/RF wideband matching circuits, LO/IF input balun circuits, and an RF output balun circuit. The measured results of the fabricated mixer show positive power conversion gain from 1 GHz to 6 GHz, bandwidth of 4.5 GHz, LO isolation (LO to IF isolation and LO to RF isolation) between 27 dB and 45 dB, OIP3 between -2 dBm and -12 dBm, current consumption of 29 mA for 3.0 V supply voltage. The chip size of the fabricated mixer is 2.7 mm/spl times/1.6 mm.

A 5.8 GHz MMIC Down-Conversion Mixer for DSRC Receiver using SiGe BiCMOS Process

DSRC (dedicated short range communication) provides high speed radio link between road side equipment and on-board equipment within the narrow communication area. In this paper, a 5.8 GHz MMIC down-conversion mixer for DSRC receiver is designed and fabricated using SiGe BiCMOS process technology. RF/LO matching circuits, active-based RF/LO input balun circuits, and active-based IF output balun circuit are all integrated on chip with mixer core circuit. The measured results of the fabricated mixer show conversion gain of 5.5 dB, LO to RF isolation of 44 dB, and LO to IF isolation of 40 dB, IIP3 of 1.8 dBm. The chip size of the fabricated mixer is 1.9 mm times 1.2 mm