Design of a digital FM demodulator based on a 2nd-order all-digital phase-locked loop

Juan Pablo Martinez Brito, Sergio Bampi
2008 Analog Integrated Circuits and Signal Processing  
Software-defined radio (SDR) is a revolution in radio design due to the ability to create radios that can selfadapt on the fly. In SDR devices, all of the signal processing is implemented in the digital domain, mainly on DSP blocks or by DSP software. By simply downloading a new program, a SDR device is able to interoperate with different wireless protocols, incorporate new services, and upgrade to new standards. Therefore, massively parallel signal processing at higher frequencies are needed
more » ... implement a realistic SDR. Thus, FPGAs have been used extensively for implementing essential functions in SDR architectures at lower frequencies. In this paper, we explore the design of a digital FM receiver using the approach of an All-Digital Phase Locked-Loop (ADPLL). The circuit is designed in VHDL, then synthesized and simulated using LeonardoSpectrum Level 3 and Model-Sim SE 6, respectively. It operates at a frequency up to 150 MHz and occupies the area of roughly 15 K logic gates.
doi:10.1007/s10470-008-9184-7 fatcat:f4uwubdh75bblcmax4kkbfedyq