voltage-dependent DRC checks
In T* DRC deck, it is based on the voltage recognition CAD layer and net connection to calculate the voltage difference between two neighboring nets by the following formula:
\[ \Delta V = \max(V_H(\text{net1})-V_L(\text{net2}), V_H(\text{net2})-V_L(\text{net1})) \]
where \[ V_H(\text{netx}) = \max(V(\text{netx})) \] and \[ V_L(\text{netx}) = \min(V(\text{netx})) \]
- The \(\Delta V\) will be 0 if two nets are connected as same potential
- If \(V_L \gt V_H\) on a net, DRC will report warning on this net
Voltage recognition CAD Layer
Two method
voltage text layer
You place specific voltage text on specific drawing layer
voltage marker layer
Each voltage marker layer represent different voltage for specific drawing layer
voltage text layer has higher priority than voltage marker layer and is recommended
voltage text layer
For example M3
| Process Layer | CAD Layer# | Voltage High | Voltage High Top (highest priority) |
Voltage Low | Voltage Low Top (highest priority) |
|---|---|---|---|---|---|
| M3 | 63 | 110 | 112 | 111 | 113 |
where 63 is layer number, 110 ~ 113 is datatype
voltage marker layer
Different data type represent different voltage, like
| DataType | 100 | 101 | 102 | ... | 109 |
|---|---|---|---|---|---|
| Voltage | 0.0 | 0.1 | 0.2 | 0.3 | 0.9 |
Example
