Dr JBO Student ID Number: Model Answer Section: 01A / 01B Lecturer: Dr. Jamaludin Bin Omar. Name:
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1 EEEB273 - Quiz 5 [Question Set 1] Section: 01A / 01B For the class AB output stage in, given that V CC = 12 V and V BB = 1.44 V. R L = 1 k. The reverse-bias saturation current for the transistors, I S = 2.2 x A. Assume >> 1. For the output voltage v O = -9.5 V: (i) Determine i L, i Cn, and i Cp. (ii) Find the power dissipated in transistor Q n. v O = -9.5 V = i L R L i L = v O /R L = (-9.5 V) /(1 k) = -9.5 ma [1] V EBP = V T ln(i Cp / I S ) = 26m ln(9.5m / 2.2x10-15 ) = V [1.5] V BEN = V BB - V EBP = = V [2] i Cn = I S exp(v BEN /V T ) = 2.2x10-15 exp(0.6838/26m) = µa [1] Actual value of i Cp = i Cn i L = 575.9µ - (-9.5m) = ma [1] V CEn = +V CC - v O = +12 (-9.5) = 21.5 V [1] P Qn = (575.9 µa)(21.5 V) = mw [0.5]
2 EEEB273 - Quiz 5 [Question Set 1] For the class AB output stage in, given that V CC = 12 V and V BB = 1.42 V. R L = 1 k. The For the output voltage v O = V: (iii)determine i L, i Cn, and i Cp. (iv) Find the power dissipated in transistor Q n. v O = V = i L R L i L = v O /R L = (-10.5 V) /(1 k) = ma [1] V EBP = V T ln(i Cp / I S ) = 26m ln(10.5m / 2.4x10-15 ) = V [1.5] V BEN = V BB - V EBP = = V [2] i Cn = I S exp(v BEN /V T ) = 2.4x10-15 exp(0.6632/26m) = µa [1] Actual value of i Cp = i Cn i L = 287.3µ - (-10.5m) = ma [1] V CEn = +V CC - v O = +12 (-10.5) = 22.5 V [1] P Qn = (283.7 µa)(22.5 V) = 6.47 mw [0.5]
3 EEEB273 - Quiz 5 [Question Set 2] For the class AB output stage in, given that V CC = 14 V and V BB = 1.46 V. R L = 1 k. The For the output voltage v O = -10 V: (v) Determine i L, i Cn, and i Cp. (vi) Find the power dissipated in transistor Q n. v O = -10 V = i L R L i L = v O /R L = (-10 V) /(1 k) = -10 ma [1] V EBP = V T ln(i Cp / I S ) = 26m ln(10m / 2.4x10-15 ) = V [1.5] V BEN = V BB - V EBP = = V [2] i Cn = I S exp(v BEN /V T ) = 2.4x10-15 exp(0.7045/26m) = µa [1] Actual value of i Cp = i Cn i L = µ - (-10m) = ma [1] V CEn = +V CC - v O = +14 (-10) = 24 V [1] P Qn = ( µa)(24 V) = mw [0.5]
4 EEEB273 - Quiz 5 [Question Set 3] For the class AB output stage in, given that V CC = 12 V and V BB = 1.4 V. R L = 1 k. The For the output voltage v O = -8.5 V: (vii) Determine i L, i Cn, and i Cp. (viii) Find the power dissipated in transistor Q n. v O = -8.5 V = i L R L i L = v O /R L = (-8.5 V) /(1 k) = -8.5 ma [1] V EBP = V T ln(i Cp / I S ) = 26m ln(8.5m / 2.4x10-15 ) = V [1.5] V BEN = V BB - V EBP = = V [2] i Cn = I S exp(v BEN /V T ) = 2.4x10-15 exp(0.6487/26m) = µa [1] Actual value of i Cp = i Cn i L = 164.5µ - (-8.5m) = ma [1] V CEn = +V CC - v O = +12 (-8.5) = 20.5 V [1] P Qn = (164.5 µa)(20.5 V) = 3.37 mw [0.5]
5 EEEB273 - Quiz 5 [Question Set 4] For the class AB output stage in, given that V CC = 12.5 V and V BB = 1.48 V. R L = 1 k. The For the output voltage v O = -9.5 V: (ix) Determine i L, i Cn, and i Cp. (x) Find the power dissipated in transistor Q n. v O = -9.5 V = i L R L i L = v O /R L = (-9.5 V) /(1 k) = -9.5 ma [1] V EBP = V T ln(i Cp / I S ) = 26m ln(9.5m / 2.4x10-15 ) = V [1.5] V BEN = V BB - V EBP = = V [2] i Cn = I S exp(v BEN /V T ) = 2.4x10-15 exp(0.7258/26m) = µa [1] Actual value of i Cp = i Cn i L = µ - (-9.5m) = ma [1] V CEn = +V CC - v O = (-9.5) = 22 V [1] P Qn = ( µa)(22 V) = mw [0.5]
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