Bilal AmjadHassan Tariq2025-12-252025-12-252012https://escholar.umt.edu.pk/handle/123456789/18010In our final year project, we successfully amplified a random signal with less power dissipation and higher efficiency using a Class D amplifying system. Firstly, we implemented a Class A amplifier and calculated its power dissipation, which was too large. Therefore, we researched different classes of amplifying systems and selected Class D because it is a highly efficient amplifying class. For the analog Class D amplifying system, we implemented three blocks. Firstly, the modulation block takes the random audio signal, compares it with a triangular carrier signal, superimposes it onto the carrier, and generates a PWM signal. Secondly, the switching output block (inverter, gate driver, switching MOSFETs) takes the PWM output and amplifies it to the required level. The gate driver is necessary to operate the switching MOSFETs according to requirements, and the proposed gate driver consumes much less energy while minimizing conduction and switching losses (delay time, rise time, reverse recovery time, fall time, and decay time). Thirdly, the low-pass filter block is used to recover the original random signal. For the digital Class D amplifying system, we implemented three blocks. Firstly, the UPWM (uniform pulse width modulation) block takes the digital signal and converts it into a staircase signal, which is then fed into the switching output block. We implemented UPWM using the PIC 16F877A microcontrollerenThesis