Design of a CMOS Current-reuse LC VCO
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This paper presents a cascode CMOS current-reuse voltage-controlled oscillator (LC VCO) for 24GHz automotive collision radar. This circuit is designed using 65nm CMOS technology. The VCO in modified current-reuse configuration where transistors are biased in subthreshold region to save power consumption. This scheme is utilized to simultaneously reduce the power consumption, and increase the transconductance and gain of the VCO circuit. The capacitive-feedback technique, including two series capacitors is also used to improve voltage swing of output ports under low power and low supply voltage conditions. This circuit also has fully-differential configuration to reduce RF noise and harmonic distortion. The proposed VCO showed phase noise of -123dBc/Hz at 1MHz offset, and power consumption of 321μW at power supply of 950mV with a FOM of -204 dBc/Hz. The die area occupied 0.35mm2.
Abstract
This paper presents a cascode CMOS current-reuse voltage-controlled oscillator (LC VCO) for 24GHz automotive collision radar. This circuit is designed using 65nm CMOS technology. The VCO in modified current-reuse configuration where transistors are biased in subthreshold region to save power consumption. This scheme is utilized to simultaneously reduce the power consumption, and increase the transconductance and gain of the VCO circuit. The capacitive-feedback technique, including two series capacitors is also used to improve voltage swing of output ports under low power and low supply voltage conditions. This circuit also has fully-differential configuration to reduce RF noise and harmonic distortion. The proposed VCO showed phase noise of -123dBc/Hz at 1MHz offset, and power consumption of 321μW at power supply of 950mV with a FOM of -204 dBc/Hz. The die area occupied 0.35mm2.
참고문헌 (3)
- J. Kim, "A 44 GHz differentially tuned VCO with 4 GHz tuning range in 0.12pm SOI CMOS", Proc. IEEE Solid-State Circuit Conf, pp.416~607 (2005)
- C.-P. Liang, "Low-power VCO with phase-noise improvement in 0.18pm CMOS technology", Electron. Lett, 46(20), pp.1385~1387 (2010)
- Q. D. Bui, "Low-power, low-phase-noise tuned-input tuned-output VCO withloop gain enhancement", Electron. Lett., 48(19), pp.1192~1193 (2012)