Wheatstone bridge based offset cancelling method utilizing a JFET as a voltage-controlled resistor

•Utilize a Wheastone bridge circuit to cancel the offset.•The bridge circuit consists of 2 resistors, a variable resistor, and a JFET.•JFET is used both as a voltage-controlled resistor and as an amplifying element.•Our method not only cancels the offset voltage but also provides the voltage gain.•Our method can be widely applied to cancel the offset voltages.