请教HSPICE里面怎么仿真ft (截止频率) ？

renzhixiong

同问，以前看过这样一个语句：.probe ft = par('gmo(m1)/(2*3.14*cggbo(m1))')，可仿出来的结果很是离谱，求解释……

renzhixiong

回复 1# happsky


   .option post=1 brief dccap 上面这句是必须的，dacap的作用如下：
DCCAP Used togenerate C-V plots and to print out the capacitance values of a circuit(both model and element) during a DC analysis.

C-V plots are often generated using a DC sweep of the capacitor.

The default value equals 0 (off).

然后用如下公式（可参考Razabi的书）：

.probe ft = par('gmo(m1)/(2*3.14*cggbo(m1))')

即可得到管子的截止频率！