Question 4.3: The data sheet for an n-channel JFET shows a maximum IGSS of...

The data sheet for an n-channel JFET shows a maximum I_{GSS} of -0.1 nA at 25°C for V_{GS}= -30 V and a maximum I_{GSS} of -100 nA at 150°C for V_{GS}   = -30 V. Determine the minimum input resistance at 25°C. 

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R_{IN} = \left|\frac{V_{GS} }{I_{GSS} } \right| = \frac{30  V }{0.1  nA } = 300 GΩ

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