一种低功耗交叉耦合环形振荡器

Low Power Noise VCO with Cross-Coupled Cell

通过引入NMOS交叉耦合结构,设计了一种低功耗,低相位噪声的二级环形振荡器。采用TSMC 0.25μm CMOS工艺参数,用Cadence的Spectre软件进行仿真,在3.3V电压下,工作频率可达2G,偏离主频1MHz处相位噪声为-95.6dBc/Hz。功耗为3.2mW。

The NMOS cross -coupled configuration are used to design a low power and low phase noise two - stage VCO. An even stage ring oscillator is adopted to generated two quadrature output clock of 90 degree phase differences. The design is fabricated in 0.25μm CMOS process of TSMC and was simulated by cadence spectre, when the voltage is 3.3V, the VCO has a phase noises of - 95.6dBc/Hz offset when it is operated at 2GHz. the core circuit dissipate a total power of 3.2mW.