| 摘要 |
An electrostatic discharge protection circuit for protecting the output of a CMOS circuit includes the use of a saturation attenuation resistor in series with the output. The saturation attenuation resistor exhibits a low resistance value under low current conditions and a high resistance value under high current conditions. The saturation resistor in series with the output of a CMOS circuit thus has little effect on the current drive capability of that circuit during its normal operation. Upon the application of a high current ESD transient to the output, however, the saturation resistor assumes a high resistance value that acts to attenuate the voltage of the transient and protect the delicate gate dielectric of transistors at the output of the circuit.
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