Low Phase Noise and Wide Tuning Range VCO Using the MOS Differential Amplifier with Active Load

Cher-Shiung Tsai, Kwang-Jow Gan, Ming-Shin Lin

Department of Electrical Engineering, National Chiayi University, Chinese Taipei.
Department of Electronic Engineering, Kun Shan University, Chinese Taipei.

DOI: 10.4236/cs.2012.34043                

Abstract

We demonstrate the design of a novel voltage-controlled oscillator (VCO), which is based on a metal-oxide-semiconductor field-effect transistor (MOS) differential amplifier with active load. This VCO achieves low phase noise and wide tuning range. The phase noise is –120 dBc/Hz at 600 KHz offset from a 1.216 GHz carrier frequency. This value is comparable to that of a LC-based integrated oscillator. The operating frequency can be tuned from 117 MHz to 1.216 GHz with the supply voltage varying from 1.3 V to 3.3 V. Therefore, the tuning range is about 90.38% which is larger than most of the LC and ring oscillator. The VCO circuit, which is constructed using a standard 0.35 μm CMOS technology, occupies only 26.25 × 7.52 μm2 die area and dissipated 10.56 mW under a 3.3 V supply voltage.

Keywords

Voltage-Controlled Oscillator (VCO); Differential Amplifier; Phase Noise; Tuning Range

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	P. Andreani and H. Sjoland, “A 2.2 GHz CMOS VCO with Inductive Degeneration Noise Suppression,” Proceedings of the IEEE Conference on Custom Integrated Circuits, San Diego, 6-9 May 2001, pp. 197-200.
[2]	M. Tiebout, “Low-Power Low-Phase-Noise Differentially Tuned Quadrature VCO Design in Standard CMOS,” IEEE Journal of Solid-State Circuits, Vol. 36, No. 7, 2001, pp. 1018-1024. doi:10.1109/4.933456
[3]	P. Andreani, A. Bonfanti, L. Romano and C. Samori, “Analysis and Design of a 1.8-GHz CMOS LC Quadrature VCO,” IEEE Journal of Solid-State Circuits, Vol. 37, No. 12, 2002, pp. 1737-1747. doi:10.1109/JSSC.2002.804352
[4]	C. H. Park and B. Kim, “A Low Noise, 900-MHz VCO in 0.6-μm CMOS,” IEEE Journal of Solid-State Circuits, Vol. 34, No. 5, 1999, pp. 586-591. doi:10.1109/4.760367
[5]	W. S. T. Yan and H. C. Luong, “A 900-MHz CMOS Low-Phase-Noise Voltage-Controlled Ring Oscillator,” IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, Vol. 48, No. 2, 2001, pp. 216-221. doi:10.1109/82.917794
[6]	H. Wang, N. Wu and G. Shou, “A Novel CMOS Low-Phase-Noise VCO with Enlarged Tuning Range,” Proceedings of the International Conference on Microwave and Millimeter Wave Technology, Nanjing, 21-24 April 2008, pp. 570-573. doi:10.1109/ICMMT.2008.4540456
[7]	L. S. de Paula, S. Bampi, E. Fabris and A. A. Susin, “A Wide Band CMOS Differential Voltage-Controlled Ring Oscillator,” Proceedings of the International IEEE Northeast Workshop on Circuits and Systems and TAISA Conference, Montreal, 22-25 June 2008, pp. 9-12. doi:10.1109/NEWCAS.2008.4606308
[8]	J. Kim, J. Shin, S. Kim and H. Shin, “A Wide-Band CMOS LC VCO with Linearized Coarse Tuning Characteristics,” IEEE Transactions on Circuits and Systems II: Express Briefs, Vol. 55, No. 5, 2008, pp. 399-403. doi:10.1109/TCSII.2007.914896
[9]	C. Shi, R. Zhang, L. Chen, Z. Chen and Z. Lai, “A Low Noise VCO with Quadrature Prescaler for UHF RFID Reader,” Proceedings of the International Conference on Wireless Communications and Trusted Computing, Wuhan, 25-26 April 2009, pp. 357-360.
[10]	G. Huang and B. S. Kim, “Low Phase Noise SelfSwitched Biasing CMOS LC Quadrature VCO,” IEEE Transactions on Microwave Theory and Techniques, Vol. 57, No. 2, 2009, pp. 344-351. doi:10.1109/TMTT.2008.2009901