Describe how an FET can be used as voltage variable resistor
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Explanation: FET is a device that is usually operated in the constant-current portion of its output characteristics. But if it is operated on the region prior to pinch-off (that is where VDS is small, say below 100 mV), it will behave as a voltage-variable resistor (WE).
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The main aim of the FET device is that to be operated in the constant current portion of its output characteristics.
- Not only it is working on the constant current portion but also it works on different paths.
- Like if the region is near to pinch-off that means it will going to behave as the voltage variable resistor.
- That is due to the region belongs to the drain-to-source resistance that can be controlled by the variable bias voltage.
- In such application it is named as the voltage variable resistor.
- Its drain to source voltage is below 100mV.
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