Dear Sir/Madam,

How do you length match a differential pair P and N if there is a series resistor in each side.

U1-1 -> A1_P -> R1-1, R1-2 -> A2_P -> U2-1

U1-2 -> A2_P -> R2-1, R2-2 -> A2_N -> U2-2

The diff pair is not parts of a group.

Regards Grant

Hi grant2019,

An electrical net in PADS Pro is a concatenation of two nets with a series component in between.

In (Constraint Manager) CM make sure that the series element, in this case the resistor have a tick in the series element.

The electrical net will be a net with three ^^^ attached to the alphabetically selected net that gives the name.

For differential pairs, make the diff pair connection using the electrical nets.

Now you can put a length and differential mach phase constraint in CM, and you will get a warning.

Here an example of a electrical net

Hope this helps

Matija