Diseño de Moduladores Delta-Sigma Digitales de Banda Base en 180nm CMOS (Design of Baseband Digital Delta-Sigma Modulators in 180nm CMOS)

Jorge Varona (jvarona@up.edu.mx)1, Ramiro Velazquez (rvelazquez@up.edu.mx)1, Margarita Tecpoyotl Torres (tecpoyotl@uaem.mx)2


1Universidad Panamericana
2Universidad Autonoma del Estado de Morelos

This paper appears in: Revista IEEE América Latina

Publication Date: May 2015
Volume: 13,   Issue: 5 
ISSN: 1548-0992


Abstract:
This article presents a 3rd Order 1-bit modulator optimized for applications requiring high effective resolution and linearity within the 20-kHz band. Furthermore, this work also describes architectural approaches for designing modulators with different order, oversampling rate, and number of quantization bits. Such approaches can be leveraged in a variety of applications in digital signal processing for data communications, filters, motor controllers, data acquisition, high-fidelity audio, DACs, and others operating in baseband. The 3rd Order modulator was implemented in standard 180nm CMOS; experimental measurements show a SNDR=126dB equivalent to 20-bits of effective resolution with a total harmonic distortion THD=0.03%. The circuit is able to operate in low-voltage conditions from 0.55 to 1.8 Volts.

Index Terms:
Delta-Sigma Modulation, Digital Signal Processing (DSP), CMOS circuits, low voltage.   


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