CX1900-0101倍福模块

CX1900-0101倍福模块

直流应用的保护电路为例进行说明。直流应用的保护电路如图9所示。其中TVS管是瞬态二极管，防止瞬间大电压损坏AFE031，TVS的钳位电压应稍大于PA_Vs/2，要在确保不误触发的前提下提高保护的可靠性。肖特基二极管D1-D2的作用是抑制持续过电压对AFE01的影响。而由于D1-D2具有结电容，结电容的不平衡将导致直流偏压不能维持在PA_Vs/2，分压器Rb1-Rb2的作用正是要改善这种情况，使PA输出有正确的直流偏置。稳压管Z的作用是稳定AFE031的PA供电电压PA_Vs。Lo-Co-Ro组合作为一个额外的噪声或振铃吸收器，选取的经验值为Ro=4.7Ω，

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