变压器反馈的超低功耗低相位噪声CMOSLC-VCO设计

Design of Ultra-Low-Power Low Phase Noise CMOS LC-VCO with Transformer Feedback

摘要: 设计了一种全集成交叉耦合变压器反馈的Lc压控振荡器（LC．VCO），该VCO在电源电压低于阈值电压的情况下实现了超低功率消耗和低相位噪声。该超低功耗的VCO采用SMIC0．18p,m数模混合RFIP6MCMOS工艺进行了流片验证。测试结果表明：电路在0．4V电源供电和工作频率为2．433GHz时，相位噪声为-125．3dBc／Hz（频偏1MHz），核心直流功耗仅为720txW。芯片的工作频率为2．28—2．48GHz，调谐范围为200MHz（8．7％），电路的优值为-193．7dB，信号的输出功率约为1dBm。该VCO完全可以满足IEEE802．11b接收机的应用要求。

Abstract: A fully integrated cross-coupled LC tank voltage-controlled oscillator （LC-VCO） using transformer feed- back is proposed to achieve an ultra-low-power and low phase noise design even at a supply below the threshold voltage. The ultra-low-power VCO is implemented in mixed-signal and RF 1P6M O. 18~m CMOS technology of SMIC. The measured phase noise is - 125.3dBc/Hz at offset frequency 1MHz from the carrier of 2. 433GHz while the VCO core circuit draws only 720txW from a 0.4V supply. The designed VCO can cover the frequency range from 2.28 to 2.48GHz. The tuning range of the circuit is 200MHz（ 8.7% ）, the FOM is - 193.7dB and the output power is about ldBm which is suitable for IEEE 802. 11 b receiver.