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设计了一种基于65nm CMOS工艺的交叉耦合全差分40GHz压控振荡器(VCO)。为了减小仿真结果与测试结果的差距,对电感及其连接其他元件而延长的金属线在电磁场仿真软件里重新进行了仿真。设计中应用了厚栅容抗管来增大电压的调谐范围,从而实现更高的频率覆盖范围。流片后的测试结果表明,VCO的振荡频率覆盖38.4~43.4GHz,调谐范围达到12.2%,符合基于无线局域网IEEE 802.11ad标准设计的两级下变频60GHz无线收发机对本振频率的要求。当振荡频率为39GHz时,应用该VCO的锁相环锁定在41.76GHz时测得1 MHz偏移频率处的相位噪声为-90.9dBc/Hz。芯片采用1V电源电压供电,功耗为5.7~8.6mW,核心芯片面积为(0.197×0.436)mm~2。
A cross-coupled fully differential 40GHz voltage-controlled oscillator (VCO) based on a 65nm CMOS process is designed. In order to reduce the difference between the simulation results and the test results, the inductance of the wires and the extension of the wires connecting the other components were re-simulated in the electromagnetic field simulation software. Thick gate reactors are used in the design to increase the voltage tuning range, resulting in higher frequency coverage. The test results show that the oscillation frequency of VCO covers 38.4 ~ 43.4GHz and the tuning range reaches 12.2%, which is in line with the requirement of local oscillator frequency for two-stage down-conversion 60GHz wireless transceiver based on the IEEE 802.11ad standard of wireless LAN. When the oscillation frequency is 39GHz, the phase noise at 1MHz offset frequency measured at 41.76GHz with the VCO’s PLL lock is -90.9dBc / Hz. The chip uses 1V power supply voltage, power consumption is 5.7 ~ 8.6mW, the core chip area (0.197 × 0.436) mm ~ 2.