Experimental signal/noise-ratio comparison of the second-order phase-locked loop and the second-order frequency-locked loop

The signal/noise ratio performance of a novel f.m. threshold extension demodulator, the frequency-locked loop, is experimentally compared with that of the phase-locked-loop demodulator and the conventional f.m. discriminator. Experimental results indicate that the f.l.l. represents a significant improvement over the p.l.l. and the conventional discriminator for f.m. systems subject to large carrier deviations.