Title :
Reduction in harmonic distortion through use of aperiodic timing in frequency demodulation
Author :
Divakaran, Gangeshan ; Howard, Roy M.
Author_Institution :
Commun. & Signal Process. Group, Curtin Univ. of Technol., Perth, WA, Australia
Abstract :
It is demonstrated, theoretically and experimentally, that aperiodic timing based on the FM signal, as opposed to periodic timing based on a reference carrier, can lead to a significant reduction in harmonic distortion in an FM demodulator based on an exclusive OR gate and a sample and hold structure. A 20-dB improvement in harmonic distortion can be readily achieved.
Keywords :
frequency modulation; harmonic distortion; logic gates; phase detectors; sample and hold circuits; FM demodulator; FM signal; aperiodic-periodic timing; exclusive OR gate; harmonic distortion; phase detector; reference carrier; sample and hold structure; Amplitude modulation; Delay effects; Demodulation; Frequency modulation; Harmonic distortion; Periodic structures; Phase detection; Phase frequency detector; Signal generators; Timing; Exclusive OR gate; frequency demodulation; phase detector; sample and hold;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2004.835329
