Abstract
Frequency pulling of an oscillator integrated in a quadrature phase-shift keying wireless transmitter degrades the performance of the wireless system. This paper analyses the behavior of an oscillator in the presence of coupling between the oscillator and a power amplifier or antenna. Symbol switching in the modulator will cause frequency shifts in the oscillator at the modulation frequency. A new architecture for a 120 GHz quadrature frequency generator with large tuning range and immunity against PA–VCO coupling is presented. Combining the output signals of two independent oscillators, the pulling effect is removed and the frequency generator can be integrated with a PA and an antenna on the same chip. This architecture also makes quadrature generation with large tuning range feasible at 120 GHz. The chip is fabricated in a 45 nm CMOS technology and shows a tuning range of 16.2 GHz (13.5 \(\%\)), a phase noise of \(-\)112 dBc/Hz @ 10 MHz offset and a phase error of 5\(^\circ\) (Volkaerts et al. in: IEEE Radio Frequency Integrated Circuits Symposium (RFIC), 2013).
Similar content being viewed by others
References
Deferm, N., & Reynaert, P. (2013). Design, implementation and measurement of a 120 GHz 10 Gb/s phase-modulating transmitter in 65 nm LP CMOS. Analog Integrated Circuits and Signal Processing. doi:10.1007/s10470-013-0027-9.
Deferm, N., Volkaerts, W., Osorio, J. F., de Graauw, A., Steyaert, M., & Reynaert, P. (2013). In A 120GHz fully integrated 10 Gbps wireless transmitter with On-chip antenna in 45nm LP CMOS. IEEE European Solid-State Circuits Conference (ESSCIRC). (pp. 331–334).
Tytgat, M., & Reynaert, P. (2013). A plastic waveguide receiver in 40nm CMOS with on-chip bondwire antenna. In IEEE European Solid-State Circuits Conference (ESSCIRC). (pp. 335–338).
Bronckers, S., Vandersteen, G., De Locht, L., Libois, M., Van der Plas, G., & Rolain, Y. (2009). Experimental analysis of the coupling mechanisms between a 4 GHz PPA and a 5 GHz LC-VCO. IEEE Transactions on Instrumentation and Measurement, 58(8), 2706–27139.
Adler, R. (1973). A study of locking phenomena in oscillators. Proceedings of the IEEE, 61(10), 1380–1385.
Razavi, B. (2004). A study of injection locking and pulling in oscillators. IEEE Journal of Solid-State Circuits, 39(9), 1415–1424.
Hsiao, C.-H., Chen, C.-T., Horng, T.-S., & Peng, K.-C. (2012). Design of a direct conversion transmitter to resist combined effects of power amplifier distortion and local oscillator pulling. IEEE Transactions on Microwave Theory and Techniques, 60(6), 2000–2009.
Volkaerts, W., Steyaert, M., & Reynaert, P. (2011). 118GHz fundamental VCO with 7.8% tuning range in 65nm CMOS. In IEEE Radio Frequency Integrated Circuits Symposium (RFIC). (pp. 1–4).
Hsiao, C.-H., Li, C.-J., Wang, F.-K., Horng, T.-S., & Peng, K.-C. (2010). Analysis and improvement of direct-conversion transmitter pulling effects in constant envelope modulation systems. IEEE Transactions on Microwave Theory and Techniques, 58(12), 4137–4146.
Volkaerts, W., Steyaert, M., & Reynaert, P. (2013). A 120GHz quadrature frequency generator with 16.2GHz tuning range in 45nm CMOS. In IEEE Radio Frequency Integrated Circuits Symposium (RFIC) (pp. 207–210).
Andreani, P., & Wang, X. (2004). On the phase-noise and phase-error performances of multiphase LC CMOS VCOs. IEEE Journal of Solid-State Circuits, 39(11), 1883–1893.
Khamaisi, B., & Socher, E. (2013). A 159–169 GHz frequency source with 1.26 mW peak output power in 65 nm CMOS. In European Microwave Integrated Circuits Conference (EuMIC). (pp. 536–539).
Cao, C., & O, K. (2006). A 140-GHz fundamental mode voltage-controlled oscillator in 90-nm CMOS technology. IEEE Microwave and Wireless Components Letters, 16(10), 555–557.
Badalawa, W., Lim, S., & Fujishima, M. (2009). In 115GHz CMOS VCO with 4.4% tuning range. European Microwave Integrated Circuits Conference (EuMIC). (pp. 128–131).
Decanis, U., Ghilioni, A., Monaco, E., Mazzanti, A., & Svelto, F. (2011). In A mm-Wave quadrature VCO based on magnetically coupled resonators. IEEE International Solid-State Circuits Conference Digest of Technical Papers (ISSCC). (pp. 280–282).
Wu, L., & Luong, H. (2012). A 49-to-62GHz CMOS quadrature VCO with bimodal enhanced magnetic tuning. In IEEE European Solid-State circuits Conference (ESSCIRC). (pp. 297–300).
Lin, C.-H., Liu, Y.-C., Yeh, Y.-L., Chiu, H.-C., & Chang, H.-Y. (2013). A 60-GHz low DC power self-injection coupling CMOS quadrature voltage-controlled oscillator with high quadrature accuracy. In IEEE MTT-S International Microwave Symposium Digest (IMS). (pp. 1–3).
Yi, X., Boon, C.C., Liu, H., Lin, J.F., Ong, J.C., & Lim, W.M. (2013). A 57.9-to-68.3GHz 24.6mW frequency synthesizer with in-phase injection-coupled QVCO in 65nm CMOS. In IEEE International Solid-State Circuits Conference Digest of Technical Papers (ISSCC). (pp. 354–355).
Lin, K.-T., Chen, H.-K., & Lu, S.-S. (2013). 100 GHz transformer-coupled quadrature oscillator. Electronics Letters, 49(4), 266–267.
Acknowledgments
The research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Program (FP/2007-2013) / ERC Grant Agreement No. 227680. The authors want to thank NXP Research Eindhoven for supporting this research.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Volkaerts, W., Steyaert, M. & Reynaert, P. A 120 GHz QVCO with 16.2 GHz tuning range resistent against VCO pulling in 45 nm CMOS. Analog Integr Circ Sig Process 82, 359–368 (2015). https://doi.org/10.1007/s10470-014-0474-y
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10470-014-0474-y