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A npn bipolar transistor having uniform doping of NE=1018 cm-3
,
NB=1016 cm-3 and NC=6×1015 cm-3
is operating in the inverse-active
mode with VBE= -2 V and VBC = 0.6 V.
(a) Calculate the minority carrier concentration at x= xB and x
//=0. 3
(b) Calculate the Base-Collector junction voltage (VBC), at which the
minority carrier electron concentration at x
//= xB is 20% of the
majority carrier hole concentration.?
Most Upvoted Answer
A npn bipolar transistor having uniform doping of NE=1018 cm-3 , NB=10...
Minority Carrier Concentration Calculation:
- At x= xB:
Given NE = 10^18 cm-3, NB = 10^16 cm-3 and NC = 6×10^15 cm-3.
At x = xB, the minority carrier concentration is given by:
p(x) = pB * exp((xE - x)/Lp), where pB is the majority carrier concentration in the base region, xE is the position of the base-emitter junction, and Lp is the minority carrier diffusion length.
Calculate pB using the doping concentration in the base region.
Calculate Lp using the minority carrier lifetime and diffusion coefficient.
Substitute the values in the formula to find the minority carrier concentration at x = xB.
- At x //= 0.3:
At x = 0.3, the minority carrier concentration is given by:
n(x) = n0 * exp(x/Ln), where n0 is the majority carrier concentration in the emitter region and Ln is the minority carrier diffusion length.
Calculate n0 using the doping concentration in the emitter region.
Calculate Ln using the minority carrier lifetime and diffusion coefficient.
Substitute the values in the formula to find the minority carrier concentration at x //= 0.3.

Base-Collector Junction Voltage Calculation:
- At x //= xB is 20% of the majority carrier hole concentration:
Given that the minority carrier electron concentration at x //= xB is 20% of the majority carrier hole concentration, we can equate the two concentrations and solve for VBC.
Set the minority carrier electron concentration at x //= xB equal to 0.2 times the majority carrier hole concentration.
Using this relationship and the minority carrier concentration formula, we can find the Base-Collector junction voltage (VBC) at which the condition is satisfied.
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A npn bipolar transistor having uniform doping of NE=1018 cm-3 , NB=1016 cm-3 and NC=6×1015 cm-3 is operating in the inverse-active mode with VBE= -2 V and VBC = 0.6 V. (a) Calculate the minority carrier concentration at x= xB and x //=0. 3 (b) Calculate the Base-Collector junction voltage (VBC), at which the minority carrier electron concentration at x //= xB is 20% of the majority carrier hole concentration.?
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A npn bipolar transistor having uniform doping of NE=1018 cm-3 , NB=1016 cm-3 and NC=6×1015 cm-3 is operating in the inverse-active mode with VBE= -2 V and VBC = 0.6 V. (a) Calculate the minority carrier concentration at x= xB and x //=0. 3 (b) Calculate the Base-Collector junction voltage (VBC), at which the minority carrier electron concentration at x //= xB is 20% of the majority carrier hole concentration.? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about A npn bipolar transistor having uniform doping of NE=1018 cm-3 , NB=1016 cm-3 and NC=6×1015 cm-3 is operating in the inverse-active mode with VBE= -2 V and VBC = 0.6 V. (a) Calculate the minority carrier concentration at x= xB and x //=0. 3 (b) Calculate the Base-Collector junction voltage (VBC), at which the minority carrier electron concentration at x //= xB is 20% of the majority carrier hole concentration.? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A npn bipolar transistor having uniform doping of NE=1018 cm-3 , NB=1016 cm-3 and NC=6×1015 cm-3 is operating in the inverse-active mode with VBE= -2 V and VBC = 0.6 V. (a) Calculate the minority carrier concentration at x= xB and x //=0. 3 (b) Calculate the Base-Collector junction voltage (VBC), at which the minority carrier electron concentration at x //= xB is 20% of the majority carrier hole concentration.?.
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