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A Continuous Fine-Tuning Phase Locked Loop with Additional Negative Feedback Loop

추가적인 부궤환 루프를 가지는 연속 미세 조절 위상 고정루프

Choi, Young-Shig
최영식

  • Received : 2016.01.07
  • Accepted : 2016.03.11
  • Published : 2016.04.30

Abstract

A continuous fine-tuning phase locked loop with an additional negative feedback loop has been proposed. When the phase locked loop is out-of-lock, the phase locked loop has a fast locking characteristic using the continuous band-selection loop. When the phase locked loop is near in-lock, the bandwidth is narrowed with the fine loop. The additional negative feedback loop consists of a voltage controlled oscillator, a frequency voltage converter and its internal loop filter. It serves a negative feedback function to the main phase locked loop, and improves the phase noise characteristics and the stability of the proposed phase locked loop. The additional negative feedback loop makes the continuous fine-tuning loop work stably without any voltage fluctuation in the loop filter. Measurement results of the fabricated phase locked loop in $0.18{\mu}m$ CMOS process show that the phase noise is -109.6dBc/Hz at 2MHz offset from 742.8MHz carrier frequency.

Keywords

PLL;Continuous Band-selection;Two Negative Feedback Loops;Phase Noise

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Acknowledgement

Supported by : Pukyong National University