A New Dual-Frequency LC oscillator: Analysis and Design

Subject Areas : Majlesi Journal of Telecommunication Devices

Habib Adrang ¹ , Seyed Saleh Ghoreishi ²

1 - Department of Electrical Engineering, Nour Branch, Islamic Azad University, Nour, Iran
2 - Department of Electrical Engineering, Nour Branch, Islamic Azad University, Nour, Iran

Received: 2013-06-27 Accepted : 2013-06-27 Published : 2013-09-01

Keywords: en,

Abstract :

In this paper, a new dual-frequency LC oscillator is introduced. This new architecture is designed taking the advantage of a Wheatstone-bridge LC resonator concept that enables the oscillator to generate two different frequencies simultaneously. In contrast to previous designs, no transistor switches are incorporated in the structure of this dual-frequency circuit. So, the proposed configuration is suitable for low phase noise applications. The performance of the oscillator has been verified using circuit simulations in 0.18 µm CMOS technology. Circuit simulations show phase noises of -109 dBc/Hz and -105 dBc/Hz for 1.8 GHz and 2.7 GHz frequency bands respectively in 100 kHz offset frequency.

References:

[1] Agnelli, F., G. Albasini, et al, "Wireless multi-standard terminals: system analysis and design of a reconfigurable RF front-end." Circuits and Systems Magazine, IEEE 6(1): 38-59, 2006

[2] Tasic, A., W. A. Serdijn, et al, "Adaptive multi-standard circuits and systems for wireless communications." Circuits and Systems Magazine, IEEE 6(1): 29-37 , 2006.

[3] Tiebout, M,"A CMOS fully integrated 1 GHz and 2 GHz dual band VCO with a voltage controlled inductor." Solid-State Circuits Conference, 2002. ESSCIRC 2002. Proceedings of the 28th European, 2002.

[4] Ebrahimi, A. and H. M. Naimi, "Analytical equations for oscillation amplitude of MOS Colpitts oscillator." International Journal of Electronics 98(7): 883-900 , 2011.

[5] Seong-Mo, Y. and K. K. O, "Switched resonators and their applications in a dual-band monolithic CMOS LC-tuned VCO." Microwave Theory and Techniques, IEEE Transactions on 54(1): 74-81, 2006.

[6] Sujiang, R. and H. C. Luong. "Analysis and Design of Transformer-Based Dual-Band VCO for Software-Defined Radios." Circuits and Systems I: Regular Papers, IEEE Transactions on 59(3): 449-462, 2012.

[7] Safarian, Z. and H. Hashemi, "Wideband Multi-Mode CMOS VCO Design Using Coupled Inductors." Circuits and Systems I: Regular Papers, IEEE Transactions on 56(8): 1830-1843, 2009.

[8] Guansheng, L. and E. Afshari, "A Distributed Dual-Band LC Oscillator Based on Mode Switching." Microwave Theory and Techniques, IEEE Transactions on 59(1): 99-107, 2011.

[9] Ebrahimi, A., H. M. Naimi, et al, "Remarks on Transient Amplitude Analysis of MOS Cross-Coupled Oscillators." IEICE transactions on electronics 94(2): 231-239, 2011.

[10] Adrang, H. and H. M. Naimi, "Nonlinear Analysis of BBCDR Jitter Generation Using VOLTERRA Series." Circuits and Systems II: Express Briefs, IEEE Transactions on 60(4): 197-201, 2013.

[11] Hajimiri, A. and T. H. Lee, "A general theory of phase noise in electrical oscillators." Solid-State Circuits, IEEE Journal of 33(2): 179-194, 1998.