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介绍了一款可直接由锂电池供电,基于移动全集成CMOSD类功率放大器,该放大器采用非直接反馈结构,通过在反馈环路植入二阶反馈系统,减小高频分量以及消除来自D类放大器输出端的共模干扰,同时高环路增益可获得高电源抑制比以及低THD+N;为节省PCB空间、减少系统成本、提高系统效率,放大器采用全差分“三态”调制技术以实现无滤波器应用。该放大器采用0.35μm数字工艺技术,在电源电压V_(DD)=3.6V、负载电阻为8Ω条件下,输出功率为400mW,THD+N可达0.025%;电源抑制比在217Hz处为78dB;放大器可工作于电源电压范围为2.5~4.2V;放大器芯片面积为0.85mm~2。
A lithium-battery-powered mobile-integrated CMOS class-D power amplifier is introduced. The amplifier uses an indirect feedback structure by implanting a second-order feedback system in the feedback loop to reduce the high-frequency components and eliminate noise from the Class D Common-mode interference at the output of the amplifier, while high loop gain to achieve high power supply rejection ratio and low THD + N; To save PCB space, reduce system costs and improve system efficiency, the amplifier uses a fully differential “tristate” modulation technology to Implement filterless applications. The amplifier uses 0.35μm digital technology, the power supply voltage V DD = 3.6V, the load resistance of 8Ω conditions, the output power of 400mW, THD + N up to 0.025%; power supply rejection ratio at 217Hz at 78dB; amplifier Can work in the power supply voltage range of 2.5 ~ 4.2V; amplifier chip area of 0.85mm ~ 2.