Abstract
The purpose of this thesis is to develop a switch-mode assisted linear power amplifier and demonstrate its performance. The switch-mode assisted linear amplifier topology combines current analog (Class AB) and switching (Class D) amplifier technology into one circuit. The idea behind this combination is to develop an amplifier which has high fidelity while maintaining a high efficiency.After discussing some important theoretical considerations such as the hysteresis effects and the switching frequency, the relation between the THD, power efficiency and the system parameters is described. Following this, the result of the Matlab7.0 simulations compared with PSpice simulations is presented. In addition, aiming at the improvement of signal distortion, the one sensing resister and multiple sensing resisters technology are proposed and implemented by PCB (Printed circuit board). Finally, the class AB/D audio power amplifier are designed and simulated by TSMC 0.35 2P4M (Mixed-Signal) process. The measurements of the circuit ware achieved by LT374 Waverunner and 3585A Spectrum Analyzer, and the comparison with the simulation is discussed.