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Wideband phase-locked loop with adaptive frequency response that tracks a reference
Wideband phase-locked loop with adaptive frequency response that tracks a reference
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机译:具有自适应频率响应并跟踪参考的宽带锁相环
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摘要
A self-tuning 3rd order type III phase-locked loop (PLL) is disclosed. In one aspect, the PLL provides frequency control that is implemented in three (3) parallel paths. The PLL provides frequency response tracking using a number of elements including a triple control voltage-controlled oscillator (VCO), a frequency-to-current (F2I) converter, and a switched capacitor loop filter. In addition to compensation for feedback ratio variation, near constant F2I gain over process variations and switched capacitor filters synchronized to a reference signal, near constant VCO gain over process variations allows the open loop frequency response to be tailored to track the reference signal. A high-speed locking technique is employed which significantly reduces acquisition time in low bandwidth cases. This PLL may be fabricated in a 0.18 μm CMOS logic process.
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