混合信号IC的ESD保护电路设计

Design of ESD Protection Circuit for Mixed Signal ICs

从电路设计的角度,介绍了混合信号IC的输入、输出、电源箝位ESD保护电路。在此基础上,构建了一种混合信号IC全芯片ESD保护电路结构。该结构采用二极管正偏放电模式,以实现在较小的寄生电容情况下达到足够的ESD强度;另外,该结构在任意两个pad间均能形成ESD放电通路,同时将不同的电源域进行了隔离。

ESD protection of input, output and power clamp circuits for mixed signal ICs were described from the viewpoint of circuit design. And an all-chip ESD protection circuit structure for a mixed signal IC was constructed, in which a diode forward biased discharge mode was used to achieve sufficient ESD robustness at small parasitic capacitance. In addition, the structure had an ESD bus between any two pads, which separated different power areas from each other.