Conclusion
This project involved the design of a filterless class-D amplifier involving the full flow from deciding the system specifications to finally testing the IC on a custom-designed PCB. The important parameters for the chip can be seen in the table below.
| Parameter | Value |
|---|---|
| Analog supply voltage (AVDD) | 1.8V |
| Digital supply voltage (DVDD) | 1.8V |
| Voltage gain (S/E input to differential output) | 4 |
| PWM frequency | 470kHz |
| Peak output power for 8$\Omega$ load (1kHz) | 150mW |
| $\eta_{\mathrm{max}}$ at 20kHz, 0.7V$_{\mathrm{pp}}$ input | 86.6% |
| THD at 1kHz, 0.7V$_{\mathrm{pp}}$ input | 45.6dB |
| THD at 10kHz, 0.7V$_{\mathrm{pp}}$ input | 46.8dB |