Integrated wide-band FSK demodulator based on ISPD PLL using a new model of an inverse sine function circuit

The PLL ISPD is a new phase locked loop without using any filters, basis of an inverse sine phase detector (ISPD). In this paper, we proposed a new model of inverse sine function, more effective than the existing model in precision, simplicity, robustness. Besides, this model can be expressed to the order 1 or the order 3 according to the precision arranged by the foundry. The detail of the basic analysis and mathematical model of the ISPD PLL are presented and compared with the existing model. The digital design of the system involves the use of the SIMPLORER simulator for the hardware description language VHDL-AMS. We described the performance of an integrated wide-band FSK demodulator using the ISPD contrived to improve the characteristics of the system such as large bandwidth, high frequency, a wide keep range and seizure range, and a perfect reconstruction of an input signal.