Class-D amplifiers have gained popularity for their high-power efficiency, exceeding 90%. Among them, digital-input Class-D amplifiers stand out due to their superior integration and increased immunity to electromagnetic interference (EMI). This project introduces a high-performance digital-input Class-D amplifier, aiming for a dynamic range larger than 130 dB while maintaining total harmonic distortion (THD) at approximately -110 dB.

It employs a capacitive digital-to-analog converter (CDAC) to minimize noise. Mismatch in the CDAC is addressed through mismatch shaping techniques. Additionally, an open-loop transconductance stage is incorporated into the loop filter, enhancing dynamic range and striving for optimal performance. Extra paths are introduced in the loop filter to guarantee that amplifier swings are maintained within the designated range.