PENGEMBANGAN SISTEM DELTA MODULATION KE PEMODELAN SIGNAL CONVERSION DELTA-SIGMA MODULATION

Abstract

To establish the level of the digital pulse from an analog signal after conversion system, it is required a digital
modulation system with fast and reliable bit rate in every bit build digital stream. Delta modulation is the commonly
sufficient technique to produce a long bit stream with a relatively low bit rate. However, one of its weaknesses is that
analog input signals as reference signals require a large offset frequency then obtaining small dynamic range so that the
resulting noise shape has not maximal; when its sample of rate (SOR) is raised, the floor noise level cannot be
controlled. This research aims to study Delta Sigma Modulation concept that has been tested to suppress the noise floor
and a good form noise shape while having a stable dynamic range. This basic research will emphasize the comparison of
these two forms of digital modulation and their utilization in more effective for signal conversion systems. The results
show comparison of noise transfer function (NTF) mean of Delta-Sigma Modulation power spectrum decreased to 10
dB below from Delta-Modulation. Validation of simulation results through frequency spectrum comparison shows that
Delta-Sigma Modulation has better noise shaping where noise floor can be easily nulled at position around the desired
data channel.