A Low Voltage and Power $LC$ VCO Implemented With Dynamic Threshold Voltage MOSFETS

A 1.1-GHz voltage control oscillator (VCO) using a standard 0.18-mum CMOS 1P6M process is fabricated. The VCO was designed with dynamic threshold voltage metal-oxide-semiconductor field-effect transistors and extremely-low-voltage and low power operation is achieved using on-chip transformers in positive feedback loops to swing the output signals above the supply and below the ground potential. This dual-swing capability maximizes the carrier power and achieves low-voltage performance. This VCO prototype is designed for a 0.34-V supply voltage while the output phase noise is -121.2dBc/Hz at 1-MHz offset frequency at the carrier frequency of 1.14GHz, the figure of merit is -192.0dB. The total power consumption is 103.7muW with the 0.34-V supply voltage. Tuning range is from 1.06 to 1.14GHz about 80MHz while the control voltage was tuned from 0 to 1.8V. The die area is 0.625times0.79mm2

[1]  J. A. Babcock,et al.  Comparative low frequency noise analysis of bipolar and MOS transistors using an advanced complementary BiCMOS technology , 2001, Proceedings of the IEEE 2001 Custom Integrated Circuits Conference (Cat. No.01CH37169).

[2]  Namkyu Park,et al.  1/f noise of NMOS and PMOS transistors and their implications to design of voltage controlled oscillators , 2002, 2002 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium. Digest of Papers (Cat. No.02CH37280).

[3]  Chenming Hu,et al.  A dynamic threshold voltage MOSFET (DTMOS) for ultra-low voltage operation , 1994, Proceedings of 1994 IEEE International Electron Devices Meeting.

[4]  H.C. Luong,et al.  Ultra-low-Voltage high-performance CMOS VCOs using transformer feedback , 2005, IEEE Journal of Solid-State Circuits.

[5]  J. Bokor,et al.  A dynamic threshold voltage MOSFET (DTMOS) for very low voltage operation , 1994, IEEE Electron Device Letters.

[6]  L.P.B. Katehi,et al.  An extremely low power 2 GHz CMOS LC VCO for wireless communication applications , 2005, The European Conference on Wireless Technology, 2005..