A 2.4/5.7 GHz dual-band Gilbert upconversion mixer is demonstrated using 0.35 μm SiGe BiCMOS technology. A bias-offset cross-coupled transconductance amplifier (TCA) is employed in the intermediate frequency port for the linearity improvement. The dual-band LC current combiner and the output shunt-shunt feedback buffer amplifier are in the radio frequency (RF) port. The mechanisms of the high linearity upconverter and the design flow of the dual-band LC current combiner are established in this letter. The dual-band upconverter has conversion gain of 1.5/ - 0.2 dB, OP 1dB of - 10.5/ - 9 dBm, and OIP 3 of 12/13 dBm for IF=100 MHz, RF= 2.4/5.7 GHz, respectively.
- Gilbert mixer
- LC current combiner
- Shunt-shunt feedback
- SiGe heterojunction bipolar transistor (HBT)
- Transconductance amplifier (TCA)