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1 International Journal of Microelectronics and Computer Science

1 2010

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Design of a 3rd order 1.5-bit continuous-time (CT) sigma-delta (ΣΔ) modulator optimized for class D audio power amplifier

de Melo J., Paulino N.

International Journal of Microelectronics and Computer Science

2010

Vol. 1, nr 2

156-164

This paper presents a 3rd order 1.5-bit ΣΔ modulator with distributed feedback and local resonator feedback for a Class D audio amplifier. In order to improve the signal-to-noise-and-distortion ratio (SNDR), without increasing the oversampling ratio (OSR) or the order of the modulator, the modulator uses transmission zeros and 1.5-bit quantization. High level simulations of the modulator architecture show that it has a maximum SNDR value of 81 dB, for a signal bandwidth of 18 kHz and a sampling frequency of 1.2 MHz. An electrical circuit is designed to implement the proposed architecture and the electrical simulations show that it has a maximum SNDR value of 76.1 dB. The influence of the constituting blocks of the circuit in the performance of the modulator is investigated using electrical simulations.