負回授多級放大電路之設計與實作

Abstract

本文內容提出一負回授多級放大電路的架構，此電路架構延續著多級放大電路可平均將高總功率消耗分散至各級的特點，並加以改良為一負回授架構，以提高其抗雜訊能力。且針對此架構所需的交換式供電系統作研究及實作。文中首先回顧開迴路多級放大電路的分析及數學模型。隨後接續著提出一負回授的多級放大電路架構，對此電路架構提出了數學模型分析及模擬，並對此架構作六級架構的設計與模擬。之後介紹交換式電源供應器的理論、返馳式電源供應器控制電路的分析。最後實際製作一100W的返馳式電源供應器，並量測其參數。

This article proposes a feedback structure for the multi-cell linear power amplifier circuit, which maintains the merit to divide total power dissipation to the each module. And the feedback structure can promote the ability to resist noise. The switching power supply needed by the circuit is also discussed in this article. In the beginning, we reviewed the multi-cell linear power amplifier circuit then propose a feedback structure of this circuit. The mathematical model is later build up and a six cells design of this structure is then made and analyzed. The theory of switch mode power converters is introduced. The control circuit of flyback converter is later illustrated. A 100W flyback converter is made and measured to compare with simulations.