Class AB Amplifier with Simultaneous Amplitude and Output Current Tracking

Class AB Amplifier with Simultaneous Amplitude and Output Current Tracking

In this paper a new technique is introduced for simultaneous amplitude and output current tracking of class AB amplifier. In the proposed circuit, the output voltage isprovided by a class AB amplifier benefiting from the linear characteristic of this amplifier. However, the load current is provided by a class D amplifier in order to increase theefficiency. Furthermore, the class D amplifier provides the supply voltage of class AB amplifier with the capability ofamplitude tracking. The proposed technique is simulated using PSpice software. Simulation results show efficiency improvement of at least 6% in comparison to currenttracking technique. Also, experimental results are presented to justify the validity of theoretical analysis and simulation results.