| 摘要 |
<p>A high-efficiency audio amplifier for use in high fidelity which includes a class-AB amplifier (1), which receives an audio input signal (Vs) and has a pair of final devices (3), and a power supply stage (5) for the final devices (3), which is suitable for generating a power supply voltage which can vary as a function of the audio input signal (Vs), the power supply stage (5) including a single class-D amplifier (6) which generates a first power supply voltage which is proportional to the input signal and a power supply (9) which generates a low voltage which is added to, and subtracted from, the first power supply voltage in order to maintain, across the final devices (3), a low voltage which is constant in a first embodiment and can drop to the minimum value required to keep the final devices (3) out of their saturation range in a second embodiment. <IMAGE></p> |
