Digital Frequency Multiplier for LO Generation using 22nm FDSOI

摘要

This paper presents an innovative approach, using GLOBALFOUNDRIES 22nm FDSOI technology, a Digital Frequency Multiplication technique that can be used to generate Local Oscillator signal in TDD systems radios - Wireless LAN as an example. Current WLAN radios use frequency multiplication, using mixers and transformers, and division using dividers, to plan VCO and Local Oscillator frequencies that are not harmonically related to actual transmit frequencies in order to facilitate integration of on-chip Power Amplifiers. The system designed in this paper uses Delay Locked Loop with a completely digital calibration mechanism without any charge pumps or filters. The circuit employs a unique delay cell, with back gates, designed in 22nm FDSOI technology for calibration. The overall solution is competitive, it consumes 5.5mW in power and takes 0.075mm^2 in die size for Wireless LAN MIMO radios.