Fixed Point Iteration Chaos Controlled ZCDPLL

Qassim Nasir, Kahtan Mezher


The stable operation of first and second order Zero Crossing Digital Phase Locked Loop (ZCDPLL) is extended by using a Fixed Point Iteration (FPI) method with relaxation. The non-linear components of ZCDPLL such as sampler phase detector and Digital Controlled Oscillator (DCO) lead to unstable and chaotic operation when the filter gains are high. FPI will be used to stabilize the chaotic operation and consequently extend the lock range of the loop. The proposed stabilized loop can work in higher filter gains which are needed for faster signal acquisition.


Non-Uniform Sampling, Phase Locked Loops, Digital Phase Locked Loops, Zero Crossing DPLL, Chaos Control, Fixed Point Iteration.

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