Hi,

actually I am going to simualte how an differential amplifer reject the power supply induced jitter at the output using Spectre. One suggestion is to superimpose a sinusoid signal at the power supply and run transient simulation to check the crossing deviation at the output. However, it is time penalty.

Anyone has other methods by using PSS or PXF? Thanks.

Hi Raja,

Thanks for your information. I found some useful discussions here. Actually the differential amplifier is not for any kind of osc. It is for a buffer chain.

Hi Raja,

Sorry. Maybe I misled. It is an amplifier in the PLL based freqency synth. That is why I care about o/p jitter.

Thanks

Hi Raja,

I just insert the differentail amplifier before output buffer. Using the differential one but not CMOS inverter because it suppress lot of power supply noise and substrate noise induced jitter.

Do you mean how to simulate power supply noise induced jitter or device noise induced jitter? for the device noise induced jitter, you just can easily using "Pnoise" to get the jitter results. But for power supply noise induced jitter. it is kind of confused to me. I tried using transient simulation, but it is time penalty. Now I wanna convince myself to use PXF to achieve the jitter at the output. I am still working on it. If you are also still interested in this problem or you have any good suggestion. welcome to send me email by luvckt@live.com