Hi, I am wondering how do we design and implement remote sense circuit for long cables in the custom power supply PCB design.

 

What is the application and what exactly do you want to sense?

 

Hi, I am wondering how do we design and implement remote sense circuit for long cables in the custom power supply PCB design.

We don’t, unless we have worked our way there by doing simpler things.

What is your circuit design experience?

 

Send ~30% to ~100% higher Voltage than required,
then knock it down with a Linear-Regulator on the same Board where the Load is located.
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Remote sensing with a regulated power supply can certainly lead to exciting instability and a number of other problems as well. That has been my experience. First, the remote sense input has a high sensitivity to noise, and adding noise filtering will usually add a phase shift tending to cause instability and even oscillation. So any remote sense connection must be shielded wire with the shield terminated at the supply end.
There is also a second problem, which is that the voltage drop in the "long cable" will cause the supply voltage to be momentarily much greater when there is a greater load current, and that may trigger an over-voltage shutdown condition. That problem is one I solved, in cooperation with the power supply manufacturer, by getting a power supply with the over-voltage protection set for a higher output voltage range.

BUT if your unstated application does not involve large load changes nor require good transient response of the regulator, then shielding and filtering could be adequate.