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设计了一种基于SMIC 0.18μm RF 1P6MCMOS工艺的高性能全差分环形压控振荡器(ring-VCO),采用双环连接方式,并运用交叉耦合正反馈来提高性能。在1.8V电源电压下对电路进行仿真,结果表明:1)中心频率为500MHz的环形VCO频率调谐范围为341～658MHz,增益最大值Kvco为-278.8MHz/V,谐振在500MHz下VCO的相位噪声为-104dBc/Hz@1MHz,功耗为22mW;2)中心频率为2.5GHz的环形VCO频率调谐范围为2.27～2.79GHz,增益最大值Kvco为-514.6MHz/V,谐振在2.5GHz下VCO的相位噪声为-98dBc/Hz@1MHz,功耗为32mW。该VCO适用于低压电路、高精度锁相环等。
A high performance fully differential ring-VCO based on the SMIC 0.18μm RF 1P6MCMOS process is designed using a double loop connection and cross-coupled positive feedback to improve performance. The simulation results show that: 1) the center frequency of 500MHz ring VCO frequency tuning range of 341 ~ 658MHz, the maximum gain Kvco of -278.8MHz / V, the resonance of the VCO at 500MHz phase noise Is -104dBc / Hz @ 1MHz, power consumption is 22mW; 2) The center frequency of 2.5GHz ring VCO frequency tuning range of 2.27 ~ 2.79GHz, the maximum gain Kvco of -514.6MHz / V, resonance at 2.5GHz VCO The phase noise is -98dBc / Hz @ 1MHz and the power dissipation is 32mW. The VCO for low-voltage circuits, high-precision phase-locked loop.