Open Science Research Excellence
%0 Journal Article
%A Sorore Benabid
%D 2018 
%J  International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering
%B World Academy of Science, Engineering and Technology
%I International Science Index 133, 2018
%T The Excess Loop Delay Calibration in a Bandpass Continuous-Time Delta Sigma Modulators Based on Q-Enhanced LC Filter
%U http://waset.org/publications/10008472
%V 133
%X The Q-enhanced LC filters are the most used
architecture in the Bandpass (BP) Continuous-Time (CT)
Delta-Sigma (ΣΔ) modulators, due to their: high frequencies
operation, high linearity than the active filters and a high quality
factor obtained by Q-enhanced technique. This technique consists
of the use of a negative resistance that compensate the ohmic
losses in the on-chip inductor. However, this technique introduces a
zero in the filter transfer function which will affect the modulator
performances in term of Dynamic Range (DR), stability and in-band
noise (Signal-to-Noise Ratio (SNR)). In this paper, we study the
effect of this zero and we demonstrate that a calibration of the
excess loop delay (ELD) is required to ensure the best performances
of the modulator. System level simulations are done for a 2ndorder
BP CT (ΣΔ) modulator at a center frequency of 300MHz. Simulation
results indicate that the optimal ELD should be reduced by 13% to
achieve the maximum SNR and DR compared to the ideal LC-based
ΣΔ modulator.
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