基于TSMC RF 0.18μm CMOS工艺,设计了一种可应用于IEEE 802.11ac标准的5GHz宽带LC压控振荡器。该振荡器采用了NMOS交叉耦合结构,同时采用了5位开关电容阵列以扩展调谐范围。开关电容阵列使压控振荡器的增益KVCO保持在一个较小的值,有效地降低了压控振荡器的相位噪声。后仿真结果表明,该压控振荡器在1.8V电源电压下,功耗为9mW,频率调谐范围为4.52~5.56GHz,在偏离中心频率1 MHz处仿真得到的相位噪声为-124dBc/Hz。该LC压控振荡器的版图尺寸为320μm×466μm。 Based on the TSMC RF 0.18μm CMOS process, a 5GHz wideband LC voltage controlled oscillator that can be used in the IEEE 802.11ac standard is designed. The oscillator uses an NMOS cross-coupled structure, while using a 5-bit switched capacitor array to expand the tuning range. The switched capacitor array keeps the VCO gain KVCO at a small value, effectively reducing the phase noise of the VCO. The post-simulation results show that the voltage-controlled oscillator consumes 9mW at 1.8V supply voltage, the frequency tuning range is 4.52-5.56GHz and the phase noise is -124dBc / Hz at 1MHz deviation from the center frequency. The layout of this LC voltage controlled oscillator is 320μm × 466μm.