I want to generate a frequency variable pulse signal in hspice. For example, the nominal frequency is 50Mhz, at 2us, it jump to 51Mhz, at 4us. it drop to 49Mhz and so on. How to do it? Thanks!
If phase shift is not important, you can use voltage controled resistor and capacitor to consist a vco and the control voltage implemented in vpwl, then you can get a sin wave with frequency changed as the controled voltage, and the pulse signal can be available.
Maybe this method can work