A Digital Frequency Synthesizer for Cognitive Radio Spectrum Sensing Applications

摘要

This paper presents a wide-band digital frequency synthesizer architecture targeted for spectrum sensing applications. The proposed digital period synthesizer (DPS) architecture can achieve wide operational bandwidth, extremely high frequency resolution and short settling time with low power and area consumption. The frequency synthesizer was implemented in a 65-nm CMOS process and it occupies 0.12mm{sup}2 active area. The frequency range of the synthesizer is from 0.1GHz to 4.267GHz with 0.025-5.38Hz frequency resolution. In this range, the settling time for any arbitrary frequency jump is less than 30ns. The power consumption ranges from 3.6 to 8.4mW.