A 2.4GHz to 3.86GHz digitally controlled oscillator with 18.5kHz frequency resolution using single PMOS varactor

IEICE Electronics Express

Yangyang Niu¹  Junyan Ren¹  Wei Li¹  Ning Li¹ 

[1] State Key Laboratory of ASIC & System, Fudan University

关键词: varactor;    digitally controlled oscillator;    all-digital phase-locked loop;   

DOI  :  10.1587/elex.9.1842

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(7)Cited-By(4)A novel varactor using single PMOS is proposed. By utilizing the capacitance difference between saturation and linear region, the proposed varactor can improve frequency resolution of a LC-tank based digitally controlled oscillator without introducing extra fixed loading capacitance. A digitally controlled oscillator with the proposed varactor is designed using 0.13µm CMOS technology for verification. Measurement results show that the minimum frequency resolution is achieved around 18.5kHz in a frequency range of 2.4GHz to 3.86GHz, indicating the minimum achievable capacitance step of 30aF. The measured phase noise is -120.6dBc/Hz at 1MHz offset for 3.05GHz carrier. The power consumption is 2.9mW.

【 授权许可】

Unknown