An E‐band digitally controlled oscillator with effective tuning bank

Abstract

AbstractAn E‐band digitally controlled oscillator (DCO) with effective tuning bank is presented and fabricated in 40 nm CMOS technology. The DCO is promoted with an effective fine tuning bank based on a binary‐weighted switched capacitors array connected with the secondary coil of an effective flipped stacked transformer with weak mutual coupling factor to improve the tradeoff relationship among tuning range, circuit complexity and frequency resolution. The measured best fine tuning step of the DCO is 2.21 MHz. The operating frequencies range of the DCO covers from 76.61 to 84.51 GHz. The DCO also achieves a figure of merit normalized for area (FoMA) of −185.1 dBc/Hz.