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Examples_JFET_circuits_at_DC

# Examples_JFET_circuits_at_DC - JFET circuits at DC Example...

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JFET circuits at DC Example 1.: Analyze the circuit below to determine the values of I D and V D given V p = -4V and I DSS = 10mA. V DD = 20 V R D = 1k V D I D The gate is connected to the source which implies V GS = 0 We don not know whether the device is operating in pinch-off or the triode region. We assume operation in the pinch-off region, carry out the analysis and then check whether the original assumption is correct or not. If it is in the pinch-off region, then I D = I DSS (Recall I DSS = I D for V GS = 0.) Therefore I D = 10mA. Now V D = V DD - I D R D = 20 (10mA)(1k = 10 V Check! V DG > -Vp in the pinch-off region. Since V D = 10V and V G = 0, then V DG = 10V which is larger the V p . Assumption was correct!! A JFET whose gate is connected to its source conducts a constant current equal to I DSS as long as the external circuit ensures that the voltage across the two-terminal device is always maintained at a level greater than |V P |.

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Example 2 Given V p = - 4V and I DSS = 10mA, analyze the circuit below to determine the values of I D and V
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Examples_JFET_circuits_at_DC - JFET circuits at DC Example...

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