Design of a configurable system-on-chip for audio application

A configurable SoC for audio application is introduced, based on a 16-bit fixed-point general-purpose digital signal processor (DSP) with analog modules such as analog-to-digital converter (ADC), digital-to-analog converter (DAC) and amplifier. This system supports stereo input, stereo output and a programmable sampling frequency ranging from 8kHz to 48kHz. The gain of pre-amplifiers and output amplifiers is programmable as well. And a 24-bit Sigma Delta ADC is used in the design together with optional digital filters. For different applications, the word length of audio signal can be adjusted to 24 bits or 16 bits. Designed for working on 1.8V, parts of the analog module support a suspend-state and a sleep-state, which is in favor of low power application. Moreover, the simulation and verification of some key modules are described briefly as well as the simulation model of the system. And an implementation based on 0.18 mu m CMOS technology has achieved.