本文提出了一种新颖的过零检测电路。该电路的特点在于，结构简单，易于实现，且由于所用管子较少，极大地节省了版图面积，功耗也随之降低。基于0．35μmBCD工艺，利用HsPice对该电路进行了验证。仿真结果表明，该电路在给定的工艺和温度波动范围内（-40℃-125℃）都能够实现高精度的过零检测，具有较强的鲁棒性；且电路消耗的电流仅为24μA。%The paper presents a novel zero crossing detection circuit. The characteristic of this circuit is that it has simple structure, and the circuit is easy to implement, what' s more, the structure greatly saves the area of the layout, and decreases the power consumption. Results based on the 0.35urn BCD process under the HSPICE simulation indicate that the circuit at a given process corners and temperature range ( -40℃ to 125℃ ) can do accurate zero crossing detection and keep stability very well, and the consumption of the circuit is only 24 micro amps.
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