| Summary: | 碩士 === 中華大學 === 電機工程學系 === 105 === Electronic audio equipment is indispensable equipment for modern human playing music. The audio power amplifier is a last stage for driving speaker. The amplifier’s good or bad will impact that your ears hearing the sound is good or bad.
In this thesis, computer-aided design software is used to design, simulate and verify Class A, Class B, and Class AB amplifiers.
The practical Class A amplifier is proposed by J. L. Linsley Hood in 1969. In this thesis, the amplifier’s characteristics are simulated and verified by a modern EDA tool(Cadence), which it has excellent characteristics, no cross-over distortion, and low total harmonic distortion. But it has two disadvantages, first one is the lowest efficiency and producing high heat, the second is in the small level of sound still need to consume energy of largest volume.
Class B amplifier is not suitable for use in audio, because it produced cross–over distortion. But it is the most power-saving in linear power amplifiers. The thesis focuses on its efficiency through EDA tool’s simulation verification to exam its architecture.
In this thesis, Class AB amplifier architectures are discussed, which they are modified form Class B amplifier with adjusted bias voltage point. First I have developed specifications, then executed theoretical design calculations, and finally perform the implementation and test. I also use EDA tool’s layout function to make print circuit board. Then all parts are assembled on the circuit board. All procedure is step by step. It’s a useful reference for beginner experiments.
|
|---|
