Injection-locked oscillator

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Cross coupled LC oscillator with output on top
Cross coupled LC oscillator with output on top

An injection-locked oscillator (ILO) is usually based on cross-coupled LC oscillator. It has been employed for frequency division [1] or jitter reduction in PLL, with the input of pure sinusoidal waveform. It was employed in continuous mode clock and data recovery (CDR) or clock recovery to perform clock restoration from the aid of either preceding pulse generation circuit to convert non-return-to-zero (NRZ) data to pseudo-return-to-zero (PRZ) format[2] or nonideal retiming circuit residing at the transmitter side to couple the clock signal into the data.[3] Recently, the ILO was employed for burst mode clock recovery scheme.[4]

The operation of ILO is based on the fact that the local oscillation can be locked to the frequency and phase of external injection signal under proper conditions.

[edit] See also

[edit] References

  1. ^ M. Tiebout, "A CMOS direct injection-locked oscillator topology as high-frequency low-power frequency divider," IEEE Journal of Solid-State Circuits, vol. 39, pp. 1170-1174, 2004.
  2. ^ M. De Matos, J. B. Begueret, H. Lapuyade, D. Belot, L. Escotte, and Y. Deval, "A 0.25um SiGe receiver front-end for 5GHz applications," SBMO/IEEE MTT-S International Conference on Microwave and Optoelectronics 2005, pp. 213-217.
  3. ^ [54] T. Gabara, "An 0.25 μm CMOS injection locked 5.6 Gb/s clock and data recovery cell," in Symposium on Integrated Circuits and Systems Design 1999, pp. 84 - 87.
  4. ^ J. Lee and M. Liu, "A 20Gb/s burst-mode CDR circuit using injection-locking technique," in IEEE International Solid-State Circuits Conference (ISSCC), pp. 46-586, 2007.