双模（ABD）音频功率放大器的设计文案.docVIP

PAGE II PAGE I 双模（AB/D）音频功率放大器的设计 摘 要 本文介绍了XX电子的XXXX双模（AB类/D类）音频功率放大器芯片的设计,并基于Cadence仿真软件完成了该款产品的性能仿真和应用电路的测试分析。 XXXX除主要功能模块之外，还有逻辑控制和反馈，保护（ESD保护，过温保护，过流保护，欠压保护），消pop声，缓启动等电路。XXXX是一款双声道IC功放，当耳机插入时，以单端工作模式驱动立体声耳机。 XXXX的设计采用Cadence软件，选用0.25um的CMOS工艺设计规则，进行电路逻辑设计与仿真。该款IC可以实现AB/D类一键切换，以及具有全带宽EMI抑制能力，上电，掉电噪声抑制能力。其额定工作温度范围是-40至85摄氏度；3W功率输出，D类时效率90%以上；工作电压范围：3V至5.5V；5V电源、1W输出时，0.1%的THD。 关键词：功放，音频，双模，PWM，反馈保护，逻辑控制，软启动 Design of Dual-Mode Audio Amplifier Abstract This paper introduce the design of XXXX dual-mode audio power amplifier chip which was produced by Youda Electronic, and based on the Cadence simulation software to complete the simulation analysis of performance and test the application circuit of this product . In addition to the main function module, XXXX have logic control and feedback protection (ESD protection, over temperature protection, over current protection, under voltage protection, and elimination of the pop sound, soft-start circuit). It is a two channel IC amplifier, when the headphone is inserted, driving stereo headphones with the single ended operation mode. XXXX was designed by using the Cadence software, the design rules of CMOS process with 0.25um to design and simulate circuit and layout. The model of IC can be changed for AB/D class with full bandwidth EMI excellent inhibitory ability, excellent power up, power down noise suppression ability. The rated working temperature range is -40 to 85 degrees Celsius, and 3W power output, and D class efficiency above 90%, the working voltage is 3V to 5.5V. THD is 0.1% with 5V, 1W output power. Keywords: Power Amplifier; Audio; Two Mode; PWM; Feedback Protect; Logic Control; Soft-start 目 录 TOC \o 1-3 \h \z \u 第一章 引言 1 第二章 系统设计方案 1 2.1 Cadence软件的简介 1 2.2 系统方案 1 2.2.1 系统架构及功能简介 1 2.2.2 系统稳定性的分析 3 2.3 各模块电路的设计 4 2.3.1 CMOS集成电路的设计思想 4 2.3.2 D类功放系统的改进 5 2.3.3 低功耗性能设计 8 2.3.4 基准电源的设计 9 2.3.5 前置放大器设计 14 2.3.6 振荡器的设计 19 2.3.7 全差放大器设计 21 2.3.