一种低功耗C类LC压控振荡器

A Low Power Class-C LC Voltage Controlled Oscillator

采用SMIC 65nm标准CMOS工艺,设计了一种新型的低功耗电容电感压控振荡器(LC VCO)。采用幅度监测负反馈技术,保证振荡器正常启动并且工作于C类工作状态,最大程度地增加输出摆幅。与常规C类电容电感压控振荡器不同,采用电流复用技术可以在保证性能不变的情况下使VCO的功耗下降50%。后仿真结果表明,在1.2V电源电压下,该压控振荡器的功耗为1.1mW,相位噪声为-123dBc/Hz@1MHz,FOM为190,振荡频率范围为2.3~2.6GHz,可调谐范围为12%。

Based on a standard SMIC 65 nm CMOS process, a new low power LC voltage controlled oscillator was designed. The technology of amplitude negative feedback loop was used to guarantee the oscillator＇s robust start-up and ensure the oscillator to work in class-C region, so as to maximize the output swing. Compared with classical differential-pair voltage controlled oscillator, the proposed voltage controlled oscillator only needed half of the power budget while the other performances maintained by using the current reusing technology. Post-simulation results showed that the power consumption was 1.1 mW at 1.2 V power supply, the phase noise was --123 dBc/Hz at 1 MHz offset frequency, the figure of merit（FOM） was 190, the oscillating frequency was from 2.3 to 2.6 GHz, and the tuning range was about 12%.