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Time-based frequency band selection method for phase-locked loops

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2 Author(s)
Lin, T.-H. ; Graduate Inst. of Electron. Eng., Nat. Taiwan Univ. Taipei, Taiwan ; Lai, Y.-J.

High-performance phase-locked loops (PLLs) often require voltage-controlled oscillators (VCOs) employing both discrete and continuous tuning mechanisms to satisfy a wide frequency range and a low VCO tuning gain simultaneously. An auxiliary circuit is required to facilitate the selection among a group of discrete bands. An agile technique to search for an optimum VCO frequency band is proposed. The search is based on measuring the period difference between a reference and the VCO-divided signals. The VCO band selection circuit is implemented with a 10 GHz PLL in a 0.18 μm CMOS process and consumes only an extra 3 mA. The band selection time is less than 4 μs.

Published in:

Electronics Letters  (Volume:41 ,  Issue: 23 )