A Low Power Hybrid DCO Using Three Transistor (3-T) XNOR Gate, CMOS and Pseudo-NMOS Inverter
Abstract
This research article presents a comprehensive investigation of three-bit hybrid-digitally controlled ring oscillator (HDCRO) implemented with TMSC 90nm CMOS technology. The hybrid circuit HDCRO comprises of three distinct delay stages, namely XNOR-based inverter, a CMOS inverter, and a Pseudo-NMOS inverter, all of which have been designed utilizing an inversion MOS varactor (IMOS). Furthermore, the investigation explores the output frequency variation in the load element of the HDCRO by adjusting the capacitance of the digitally controlled MOS varactors. This frequency variation occurs as a result of changing the digital control bits of the MOS varactors at a supply voltage of 0.7 V. The proposed HDCRO demonstrates an oscillation frequency range of 2.558 GHz to 2.649 GHz, with power consumption varying from 3.638 mW to 1.046 mW, and phase noise from -68.070 dB@1 MHz to -67.654 dB@1 MHz relative to the central oscillation frequency. Moreover, by applying a supply voltage variation between 0.5 V and 1 V, a wider frequency tuning range of 1.238 GHz to 4.438 GHz is achieved. This extended tuning range exhibits power consumption variation from 2.785 µW to 54.66 mW, and phase noise from -68.812 dB@1 MHz to -65.445 dB@1 MHz relative to the central oscillation frequency. In summary, this study presents a novel HDCRO architecture that demonstrates excellent performance in terms of frequency range, power consumption and phase noise. The proposed design offers advantages of high speed, low-power and good frequency range; thus has a promising prospect of application in high-performance integrated circuits.
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References
Staszewski, R.B., Leipold, D., Muhammad, K., Balsara, P.T. (2003) Digitally Controlled Oscillator (DCO)-Based Architecture for RF Frequency Synthesis in a Deep-Submicrometer CMOS Process. IEEE transactions on circuits and systems— analog and digital signal processing, 50(11), 815-828. https://doi.org/10.1109/TCSII.2003.819128
Staszewski, R.B., Hung, C.M., Barton, N., Lee, M.C., Leipold, D. (2005) A Digitally Controlled Oscillator in a 90 nm Digital CMOS Process for Mobile Phones. IEEE journal of solid-state circuits, 40(11), 2203- 2211. https://doi.org/10.1109/JSSC.2005.857359
Hung, C.M., Staszewski, R.B., Barton, N., Lee, M. C., & Leipold, D. (2006) A digitally controlled oscillator system for SAW-less transmitters in cellular handsets. IEEE journal Solid-State Circuits, 41(5), 1160–1170. https://doi.org/10.1109/JSSC.2006.872739
Moon, B.M., Park, Y.J., Jeong, D.K., (2008) Monotonic Wide- Range Digitally Controlled Oscillator Compensated for Supply Voltage Variation. IEEE transactions on circuits and systems—II: express briefs, 55(10), 1036-1040. https://doi.org/10.1109/TCSII.2008.926793
Eliezer O, Staszewski B, Mehta, J., Jabbar, F., Bashir, I. (2010) accurate self- characterization of mismatches in a capacitor array of a digitally controlled oscillator. Proc. IEEE Dallas Circuits and Systems Workshop,IEEE, Richardson, TX, USA,1–4. https://doi.org/10.1109/DCAS.2010.5955030
Pokharel, R.K, Tomar, A., Kanaya, H., Yoshida, K. (2011) 3.6 GHz Highly Monotonic Digitally Controlled Oscillator for All Digital Phase Locked Loop. IEEE MTT-S International Microwave Symposium,IEEE, Baltimore, MD, USA. https://doi.org/10.1109/MWSYM.2011.5972617
Su, M.C., Jou, S.J., Chen, W.Z. (2015) A Low-Jitter Cell-Based Digitally Controlled Oscillator with Differential Multiphase Outputs. IEEE transactions on very large scale integration (VLSI) systems, IEEE, 23(4), 766-770. https://doi.org/10.1109/TVLSI.2014.2314740
Bashir, I., Staszewski, R.B., Balsara, P.T. (2016) A Digitally Controlled Injection-Locked Oscillator with Fine Frequency Resolution. IEEE journal of solid-state circuits, IEEE, 51(6), 1347-1360. https://doi.org/10.1109/JSSC.2016.2539342
Kumar, M. (2022) a low power digitally controlled oscillator design with IMOS Varactor tunning concept Journal of The Institution of Engineers (India): Series B, 103(1), 1-11. https://doi.org/10.1007/s40031-021-00621-6
Taha, I., Mirhassani, M. (2019) A 24-GHz DCO With High-Amplitude Stabilization and Enhanced Startup Time for Automotive Radar. IEEE transactions on very large-scale integration (VLSI) systems, 27(10), 2260-2271. https://doi.org/10.1109/TVLSI.2019.2924018
Dabas, S., Kumar, M. (2019) A CMOS based low power digitally controlled oscillator design with MOS Varactor. Springer- Analog Integrated Circuits and Signal Processing, 100, 565- 575. https://doi.org/10.1007/s10470-019-01476-0
Yuan, C., Shekhar, S. (2019) A Supply-Noise-Insensitive Digitally Controlled Oscillator. IEEE, transactions on circuits and systems–i: regular papers, 66(9), 3414-3422. https://doi.org/10.1109/TCSI.2019.2924399
Hajimiri, A., Limotyrakis, S., Lee, T.H. (1998) Phase noise in multi gigahertz CMOS ring oscillators. In Proceedings of the IEEE Custom Integrated Circuits Conference (Cat. No.98CH36143), IEEE, Santa Clara, CA, USA. 49–52. https://doi.org/10.1109/CICC.1998.694905
Tomar, A., Pokharel, R.K., Nizhnik, O., Kanaya, H., Yoshida, K. (2007) Design of 1.1 GHz highly linear digitally-controlled ring oscillator with wide tuning range. In IEEE International Workshop on Radio-Frequency Integration Technology, IEEE, Singapore. 82–85. https://doi.org/10.1109/RFIT.2007.4443926
Dwivedi, D., Kumar, M. (2019) Design of a 3-bit digital control oscillator (DCO) using IMOS varactor tuning. Analog Integrated Circuits and Signal Processing. https://doi.org/10.1007/s10470-019-01506-x
Sadr, M.S., Ghafoorifard, H., Yavari, M., Sheikhaei, S. (2016) A Novel Low Phase Noise and Low Power DCO in 90 nm CMOS Technology for ADPLL Application. 24th Iranian Conference on Electrical Engineering (ICEE), IEEE, Shiraz, Iran, 810-815. https://doi.org/10.1109/IranianCEE.2016.7585631
Genesi, R., Paola, F.M.D., Manstretta, D. (2008) A 53 GHz DCO for mm wave WPAN. IEEE Custom Integrated Circuits Conference, San Jose, CA, 2008,IEEE, San Jose, CA, USA,571-574. https://doi.org/10.1109/CICC.2008.4672149
Wu, W., Long, J.R., Staszewski, R.B. (2013) High-Resolution Millimeter-Wave Digitally Controlled Oscillators with Reconfigurable Passive Resonators. In IEEE Journal of Solid-State Circuits, 48(11), 2785-2794 https://doi.org/10.1109/JSSC.2013.2282701
Dabas, S., Kumar, M. (2019) A CMOS based low power digitally controlled oscillator design with MOS Varactor, Springer Analog Integrated Circuits and Signal Processing, 565-575. https://doi.org/10.1007/s10470-019-01476-0
Kumar, M. (2022) a low power digitally controlled oscillator design with IMOS Varactor tunning concept, Journal of The Institution of Engineers (India): Series B, 103(1), 1-11. https://doi.org/10.1007/s40031-021-00621-6
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