ISF Simulation using Transient Analysis by injecting Impulse

Hi Ashish, 

It helps to know what product you are using (Spectre in ADE Explorer?), what analysis you are running (transient?), and what versions you are using (type this in an xterm:   spectre -W    and    virtuoso -W ).

SpectreRF is a great tool to simulate ring oscillators.   Here's a RAK (rapid adoption kit):   Simulating Ring Oscillator Using SpectreRF-APS  

best regards,

Tawna

Dear Ashish,

Ashish Papreja said:

I am trying to get the Impulse Sensitivity function for Ring Oscillator  so I am trying to follow the below steps:

i) First I am simulating the oscillator unperturbed and get the unperturbed waveform.

ii) Then I am injecting small current impulses at time instant t1, between nodes of interest with an area del q. So as a result I am getting oscillator output shifted in time domain depending upon at what time instant I am injecting the impulse current.

iii)Then I repeat the step 2 for N number of times in one period to get different N waveforms (link below)

I recently provided a means to find the ISF in Cadence using its ppv output. There is a well known relationship between the ppv and the ISF function as I am sure you already know. A summary of the method is detailed at the Forum URL:

community.cadence.com/.../isf-function-extraction-in-cadence-virtuoso

I created an example of a VCO and determined its ppv function. This will save you the effort of manually performing the individual ISF simulations and then doing the post-processing - which I have often done in the past using an ocean script.

Did you happen to see this post and, if so, was it be helpful at all?

Shawn

Dear Ashish,

Ashish Papreja said:

I am trying to get the Impulse Sensitivity function for Ring Oscillator  so I am trying to follow the below steps:

i) First I am simulating the oscillator unperturbed and get the unperturbed waveform.

ii) Then I am injecting small current impulses at time instant t1, between nodes of interest with an area del q. So as a result I am getting oscillator output shifted in time domain depending upon at what time instant I am injecting the impulse current.

iii)Then I repeat the step 2 for N number of times in one period to get different N waveforms (link below)

I recently provided a means to find the ISF in Cadence using its ppv output. There is a well known relationship between the ppv and the ISF function as I am sure you already know. A summary of the method is detailed at the Forum URL:

community.cadence.com/.../isf-function-extraction-in-cadence-virtuoso

I created an example of a VCO and determined its ppv function. This will save you the effort of manually performing the individual ISF simulations and then doing the post-processing - which I have often done in the past using an ocean script.

Did you happen to see this post and, if so, was it be helpful at all?

Shawn