EDC Unit  V Important Questions
 Explain the construction & operation of a Nchannel MOSFET in enhancement and depletion modes with the help of static drain characteristics and transfer characteristics?

 Define r_{d}, g_{m}, and of JFET.

 Analyze CS amplifier with Fixed bias and find the operating point.
 Find Z_{i}, Z_{o}, A_{v} for fixed bias circuit R_{G} = 1M, R_{D} = 5.1K, V_{DD} = 10V, V_{GS} = 1.5V, g_{m} = 2ms.

 Explain the operation of common drain amplifier with neat sketches and derive the equations for Z_{i} , Z_{o} and A_{v}.
 Write the differences between BJT and FET.
 Explain why FET is called voltage controlled device.

 Explain channel length modulation in FETs.
 Explain the construction and operation of nchannel JFET with its drain and transfer characteristics.

 The pchannel JFET has a I_{DSS} = 12mA, V_{P} = 5V and V_{GS} = 1.6V. Calculate I_{D}, g_{m} and g_{m0}.
 Analyze CS amplifier with Voltage divider bias and find the operating point.

 Draw the JFET small signal model.
 Draw the symbols of FET (JFET and MOSFET types).
 For nchannel silicon FET with a = 3 x 10^{4} cm and N_{D} = 10^{15} electrons/cm^{3} find pinch off voltage.

 Draw A.C equivalent model for JFET Common source amplifier with self bias (bypassed R_{s}) and find Z_{i}, Z_{o} and A_{v}.
 Find Z_{i}, Z_{o} and Av of JFET Common source amplifier with fixed bias with R_{G} = 1M, V_{GG} = 1.5V ,R_{D} = 5.1K, g_{m} = 2ms and r_{d} = 50K.

UpdatedOct 14, 2015

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