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 show that it has a maximum SNDR value of 82.4 dB and a dynamic range (DR) of 76 dB, for a signal bandwidth of 18 kHz and a sampling frequency of 1.2 MHz. The use of a full-bridge output stage allows 1.5-bit quantization.
|Title of host publication||-|
|Pages||531 - 535|
|Publication status||Published - 1 Jan 2010|
|Event||Mixed Design of Integrated Circuits and Systems (MIXDES), 2010 Proceedings of the 17th International Conference - |
Duration: 1 Jan 2010 → …
|Conference||Mixed Design of Integrated Circuits and Systems (MIXDES), 2010 Proceedings of the 17th International Conference|
|Period||1/01/10 → …|