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A 0.5 V Ultra-low Power Quadrature Ring Oscillator

  • João Eusébio
  • Luís B. Oliveira
  • Luís Miguel Pires
  • João P. Oliveira
Part of the IFIP Advances in Information and Communication Technology book series (IFIPAICT, volume 423)

Abstract

In this paper we present a CMOS quadrature ring oscillator operating at 0.5 V. Due to this very low voltage conditions, new project technique using the available terminal of the transistors (bulk) is used in order to reduce the threshold voltage of the transistors, thus improving the voltage headroom. The technique is applied in a conventional inverter-based ring oscillator with a feedback topology capable to generate quadrature signals. Simulations results in a 130 nm CMOS technology shows that a very simple VCO in the GHz range can be obtained, by changing the bulk voltage of transistors (NMOS or PMOS). The circuit operates with less than 50 μW achieving a FoM of about -115 dBc/Hz at 10 MHz offset.

Keywords

Quadrature RC oscillator CMOS circuit Low voltage Ultra-low power 

References

  1. 1.
    Razavi, B.: RF Microelectronics, Prentice-Hall (1998)Google Scholar
  2. 2.
    Lee, T.H.: The Design of CMOS Radio Frequency Integrated Circuits, 2nd edn. Cambridge University Press (2004)Google Scholar
  3. 3.
    Crols, J., Steyaert, M.: CMOS Wireless Transceiver Design. Kluwer (1997)Google Scholar
  4. 4.
    Iniewski, K.: VLSI Circuits for Biomedical Applications. Artech House (2008)Google Scholar
  5. 5.
    Oliveira, L.B., Fernandes, J.R., Filanovsky, I.M., Verhoeven, C.J., Silva, M.M.: Analysis and Design of Quadrature Oscillators. Springer (2008)Google Scholar
  6. 6.
    Grozing, M., Philipp, B., Berroth, M.: CMOS Ring Oscillator with Quadrature Outputs and 100 MHz to 3.5 GHz Tuning Range. In: 28th Int. IEEE European Solid-State Circuits Conference 2003, ESSCCIR 2003, pp. 679–682 (September 2003)Google Scholar
  7. 7.
    Nose, K., Sakurai, T.: Optimization of VDD and VTH for Low-Power and High-Speed Applications. In: Proceedings of the ASPDAC 2000, pp. 469–474 (2000)Google Scholar

Copyright information

© IFIP International Federation for Information Processing 2014

Authors and Affiliations

  • João Eusébio
    • 2
  • Luís B. Oliveira
    • 1
    • 2
  • Luís Miguel Pires
    • 1
    • 2
  • João P. Oliveira
    • 1
    • 2
  1. 1.Centre for Technologies and Systems (CTS)UNINOVAPortugal
  2. 2.Dept. of Electrical Engineering (DEE)Universidade Nova de Lisboa (UNL)CaparicaPortugal

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