Multi-layer behavioral modeling of charge-pump phase-locked loops

A multi-layer modeling approach is proposed in this paper for creating behavioral models of charge-pump phase-locked loops, which offers great flexibility of trading off between the simulation speed and accuracy. Also the approach allows time domain noise simulation with a specific layer. A multi-layer Verilog-A charge-pump PLL model is created to illustrate the proposed approach. A simulation speed up factor of 12 to 99 is achieved with reasonable loss of accuracy.