在hspice或spectre中, 一个电阻可以设置另一个两个阻值, 一种用在DC和tran分析中, 另一个ac阻值会用于ac分析中.比如hspice:
The Rxxx resistor connects from node 98999999 to node 87654321 with a resistance of 1 ohm for DC and time-domain analyses, and 10 gigohms for AC analyses.
Rxxx 98999999 87654321 1 AC=1e10