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30 June 2005 Jitter effect comparison on continuous-time sigma-delta modulators with different feedback signal shapes
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Abstract
A comparison is presented for three different feedback signal shapes on a current mode continuous-time second order sigma-delta modulator, although, it can be extended to systems of any order. The three shapes are: rectangular, exponential, and a new mixed waveform whose pulse starts being rectangular and after a fraction of the clock period changes to decaying ramp. Simulation results at system level, using a software model, are presented. Results show that using early return to zero feedback signal shapes (exponential, mixed) the modulator performance degradation due to pulse width variation is reduced with respect to rectangular signal shapes. In addition to that, the new mixed shaped do not present the high signal peak that the exponential does. This is important from the point of view of integrator input stage because it allows power saving as well as critical input noise reduction.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. San Pablo, D. Bisbal, L. Quintanilla, J. Arias, L. Enriquez, J. Vicente, and J. Barbolla "Jitter effect comparison on continuous-time sigma-delta modulators with different feedback signal shapes", Proc. SPIE 5837, VLSI Circuits and Systems II, (30 June 2005); https://doi.org/10.1117/12.607387
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