How to Calculate the Drain-Source Resistance R
DS of a JFET Transistor
The drain-source resistance, RDS of a JFET transistor is the resistance of the transistor across its drain-source terminal.
Calculating the Drain-Source Resistance, R
The formula to calculate the drain-source resistance RDS is:
Note: VGS,off and IDSS are typically the knowns. You can get
their values from looking them up in a data table or on the package they came in.