Design and optimization of a digital FM receiver using DPLL techniques

It is a well known fact that the performance of the phase - locked loop (PLL) used as an FM demodulator may be superior to that of the conventional FM receiver in some respects. Therefore in this paper a digital approach to FM demodulation based on the digital PLL (DPLL) principle is investigated. The demodulator together with a digital IF filter and an effective method of sampling the FM signal at minimum sampling rate may be applied as a digital FM stereo receiver for broadcasting. For this application, the design and optimization of the digital receiver are discussed and results of a simulation on an all-purpose computer are presented.