The document describes a complex engineering problem to design a 3rd order class D amplifier that can achieve a THD of 30db and SNR of 80db while delivering 1W output power to a 4 ohm speaker load. It discusses open loop and closed loop class D amplifier designs, mentioning the stages of a closed loop design including loop filter, PWM, power bridge and driver, and low pass filter. It also provides a schematic of the 3rd order class D amplifier design and reports on final simulation results.