Frequency Resolution Enhancement for Digitally-Controlled Oscillator Based on a Single-Period Switching Scheme

抄録

This paper proposes a high frequency resolution Digitally-Controlled Oscillator (DCO) using a single-period control bit switching scheme. The proposed scheme controls the tuning word of DCO in a single period for the fine frequency tuning. The LC type DCO is implemented to realize the proposed scheme, and is fabricated using a standard 65nm CMOS technology. The measurement results show that the implemented DCO improves the frequency resolution from 560kHz to 180kHz without phase noise degradation with an additional area of 200µm².