6.5GHz CMOS Frequency Synthesizer With FSK Modulator

This chip will enable energy-efficient communication for low-power wireless sensor networks. Fabricated in 0.25µm BiCMOS process, the modular achieves 20µs start-up time with 2.5 Mbps data rate while consuming 22mW, where 18mW is consumed in the VCO and 4mW is consumed in the PLL.