pnsakanjankumar
Member level 2
I am trying to find the critical charge of a node by using current double exponential model I=Qt K (exp(-t/t1)-exp(-t/t2)). I am injecting a current which follows the above form. To find the critical charge I sweep the value 'Qt' until a change in the data is observed.
Simulating D-Latch
1. when Qt=17fC there is no change in the circuit. ----- No warnings
2. when Qt=50fC there is a change in the circuit. ---- There is a warning about bulk drain junction current has exceeded the limit
3. Now after simulating Qt=50fC when I change Qt to 17fC, cadence issues a warning which was not observed before (when I simulated Qt=17fC for the first time).
After that warning even if I decrease Qt the warning continues to persist. I don't understand what is the problem.
Simulating D-Latch
1. when Qt=17fC there is no change in the circuit. ----- No warnings
2. when Qt=50fC there is a change in the circuit. ---- There is a warning about bulk drain junction current has exceeded the limit
3. Now after simulating Qt=50fC when I change Qt to 17fC, cadence issues a warning which was not observed before (when I simulated Qt=17fC for the first time).
After that warning even if I decrease Qt the warning continues to persist. I don't understand what is the problem.
