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首页> 外文期刊>IEEE Journal of Solid-State Circuits >Fast-Lock Hybrid PLL Combining Fractional- $N$ and Integer-$N$ Modes of Differing Bandwidths
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Fast-Lock Hybrid PLL Combining Fractional- $N$ and Integer-$N$ Modes of Differing Bandwidths

机译:结合小数-$ N $和整数-$ N $模式的不同带宽的快速锁定混合PLL

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摘要

We introduce a single-loop PLL that operates in a narrower-bandwidth, integer-N mode during phase lock and in a wider-bandwidth, fractional-N mode during transient. This hybrid PLL, as a generalization of the conventional variable-bandwidth PLL that shifts only its bandwidth, simultaneously achieves the fast-locking advantage of the fractional-N PLL and design simplicity of the integer-N PLL, and as such, brings benefits in certain important PLL applications. In addition, the frequency division mode switching, unique in the hybrid PLL, enables a new, more digital protocol to execute bandwidth switching. A CMOS IC prototype attests to the validity of the proposed approach.
机译:我们介绍了一种单环PLL,它在锁相期间以较窄带宽,整数N模式工作,在瞬变期间以较宽带宽,分数N模式工作。作为常规可变带宽PLL的概括,该混合PLL仅改变其带宽,同时实现了小数N分频PLL的快速锁定优势和整数N分频PLL的设计简单性,因此在某些重要的PLL应用。此外,混合PLL中独有的分频模式切换使新的数字协议能够执行带宽切换。 CMOS IC原型证明了该方法的有效性。

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