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In the conventional class A, B, and AB power amplifiers, much
power are dissipd by the output transistors. Therefore, the
power conversion efficiency are greatly reduced by their output
stages. In this thesis we propose a new design for power
amplifiers, where two switching regulators are used for the
power voltage sources of output stages power amplifiers. Using
this new design, one can promote the output power conversion
efficiency much higher than the conventional power amplifiers
without any loss of the output quality. In our experiments
wecompare conventional power amplifiers with ours. The results
show that our new power amplifier really has high power
conversion efficiency and the output transistors dissipate very
few power. In the swtiching regulators, power MOSFETs are used
as switches, and the output frequency bandwidth can be as high
as 5kHz.
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