How to Maintain Current Unchanged in an NMOS Transistor?

What is the minimum value of VDS that can be reduced while maintaining the current unchanged in an NMOS transistor?

Explanation:

In an NMOS transistor, the drain current (ID) is approximately constant when VDS is in the saturation region and VGS is held constant. By reducing VDS to 0V, the transistor is effectively in cutoff mode, where no current flows between the drain and source terminals. This ensures that the current remains unchanged.

Please note that this answer assumes the transistor is operating in the saturation region, and additional conditions or constraints may apply depending on the specific circuit configuration and requirements.