A novel PLL based on phase comparison between two signals with different frequencies

For higher phase lock precision, a new principle, the equivalent phase comparison frequency (EPCF) between signals in different frequencies, is presented in this paper. Using the new PLL based on EPCF, higher phase comparison and phase lock precision can be achieved with simple electrical circuits. Evidently, this principle is based on the analysis of time and phase, rather than on frequency simply. Quite high resolution can be achieved for phase processing method based on the principle of EPCF.