To reduce the power consumption related to the RF system and to increase the output power,a cascade CMOS voltage-controlled oscillator(VCO)is proposed.The VCO core consists of a cascade structure to increase the supply voltage of the VCO.To mitigate the reliability problem associated with gate-source and gate-drain breakdowns,the gate nodes of common-source transistors are connected to the source nodes of common-gate transistors.To verify the functionality of the proposed VCO,a 2.4 GHz CMOS VCO using the 90 nm RF CMOS process is designed.It is known from the measured results that the proposed VCO can achieve a high output power,a low phase noise,and a flat-changed oscillation frequency under 2 V supply voltage.%为了降低与射频系统级相关的功耗,以及增加输出功率,提出了一种共源共栅结构的CMOS VCO.所提出的VCO核心包含有共源共栅结构,以增加VCO的供电电压.为了降低与栅源级间和栅漏级间击穿相关的可靠性问题,将共源晶体管的栅级节点与共栅晶体管的源级节点相连.为了验证所提出VCO的有效性,采用90nm的RF CMOS工艺设计了一款2.4 GHz的CMOS VCO芯片,由测试结果可得,该款VCO在2V电源电压供电下取得了相对较高的输出功率、较低的相位噪声以及变化较平缓的振荡频率.
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