350 Solved Electrical Engineering Problems: For the FE/PE Exams in Electrical Engineering
By Edward Karalis

2.5: MOSFET depletion mode

2.5 MOSFET depletion mode

The N-channel depletion mode MOSFET circuit shown in Figure 2.5 uses a combination of self and fixed bias. Determine the values of (a) V GS and (b) V DS for a quiescent drain current, I DS, of 1 ma.


Figure 2.5: MOSFET depletion mode

Solution:

V S = I DSR S = 1 10 ?3(12 10 3) = 12 volts

  1. V GS = V th ? V S = 10 ? 12 = ?2 volts

  2. V DS = V DD ? V D ? V S = V DD ? I DS(R D + R S)

    V DS = 20 ? 1 10 ?3(2 10 3 + 12 10 3) = 6 volts

Copyright Dearborn Financial Publishing, Inc. 2004 under license agreement with Books24x7
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Category: Metal-Oxide Semiconductor FET (MOSFET)

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