Implementation of 5.0GHz Wide Band RF Frequency Synthesizer for USN Sensor Nodes

摘要

This paper describes implementation of the 5.0GHz RF frequency synthesizer with 0.18μn silicon CMOS technology being used as an application of the IEEE802.15.4 USN sensor node transceiver modules. To get good performance of speed and noise, design of the each module like VCO, prescaler, 1/N divider, fractional divider with Σ-Δ modulator, and common circuits of the PLL has been optimized. Especially to get excellent performance of high speed and wide tuning range, N-P MOS core structure and 12 step cap banks have been used in design of the VCO. The chip area including pads for testing is 1.1*0.7mm~2, and the chip area only core for IP in SoC is 1.0*0.4mm~2. Through analysing of the fabricated frequency synthesizer, we can see that it has wide operation range and excellent frequency characteristics.