Author(s)

Jungnam Bae¹, Saichandrateja Radhapuram¹, Ikkyun Jo¹, Takao Kihara², Toshimasa Matsuoka^1*

¹Graduate School of Engineering, Osaka University, Osaka, Japan.
²Faculty of Engineering, Osaka Institute of Technology, Osaka, Japan.

This paper presents a low-phase-noise LC voltage-controlled oscillator (LC-VCO) with top resistive biasing in subthreshold region. The subthreshold LC-VCO has low-power and low-phase-noise due to its high transconductance efficiency and low gate bias condition. The top resistive biasing has more benefit with the feature of phase noise than MOS current source since it can support the low-noise characteristics and large output swing. The LC-VCO designed in 130-nm CMOS process with 0.7-V supply voltage achieves phase noise of -116 dBc/Hz at 200 kHz offset with tuning range of 398 MHz to 408 MHz covering medical implant communication service (MICS) band.

VCO, Resistive Biasing, Current Source, CMOS Integrated Circuit, Phase Noise, MICS Band

Bae, J. , Radhapuram, S. , Jo, I. , Kihara, T. and Matsuoka, T. (2015) A Subthreshold Low-Voltage Low-Phase-Noise CMOS LC-VCO with Resistive Biasing. Circuits and Systems, 6, 136-142. doi: 10.4236/cs.2015.65014.