Question: With reference to Figure below: (i) explain what is meant by the term 'emitter injection efficiency (Y), (ii) explain what is meant by the term 'base transport factor (a-)' and calculate the value of this parameter, (ii) explain what is meant by the term 'common base DC current gain (aDC)'and calculate the value of this parameter, (i) explain what is meant by the term 'DC current gain (BDC)y and calculate the value of this parameter for the structure shown.

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BJT Forward Active Current Flows (CE Configuration):
Emitter Injection Efficiency:
Base Transport Factor:
Y = (ep/ (lgp + lEN)
a; = (lcp / lep)
Holes
E
Rc
B
Electrons
+ Van
+ Vcc -
Base Current Flow:
DC Current Gain:
Ig1 = IEN
Is2 = Mag. (lep - lop)
doc = (Y. a7)
BJT Performance Parameters (CE Confiquration):
P
Holes
Re
B.
Electrons
+ Vce -
Key to understanding
structural design
trade-offs.
From SS Theory:
y = [ (1 + ((ni?.Dg.Ng.W) / (nig?.Dg.Ng.LE)) ] -1
ar = [ (1+ (0.5(W/ Lg)? )) ] -1
aoc = [ (at. Y)]
Boc = [ (apc/ (1- apc) ]
ww
ww
ww
ww
Transcribed Image Text:BJT Forward Active Current Flows (CE Configuration): Emitter Injection Efficiency: Base Transport Factor: Y = (ep/ (lgp + lEN) a; = (lcp / lep) Holes E Rc B Electrons + Van + Vcc - Base Current Flow: DC Current Gain: Ig1 = IEN Is2 = Mag. (lep - lop) doc = (Y. a7) BJT Performance Parameters (CE Confiquration): P Holes Re B. Electrons + Vce - Key to understanding structural design trade-offs. From SS Theory: y = [ (1 + ((ni?.Dg.Ng.W) / (nig?.Dg.Ng.LE)) ] -1 ar = [ (1+ (0.5(W/ Lg)? )) ] -1 aoc = [ (at. Y)] Boc = [ (apc/ (1- apc) ] ww ww ww ww
Question:
With reference to Figure below: (i) explain what is meant by the term 'emitter injection
efficiency (Y), (ii) explain what is meant by the term 'base transport factor (a-)' and calculate
the value of this parameter, (ii) explain what is meant by the term 'common base DC current
gain (aDC)'and calculate the value of this parameter, (ii) explain what is meant by the term 'DC
current gain (BDC) and calculate the value of this parameter for the structure shown.
Base
VBE
(Fwd. Bias)
VcB
(Rev Bias)
N++
P+
N
Emitter
Collector
NE = 101°cm
NB = 101°cm
Nc = 101cm
%3D
%3D
Y = 0.999
LB =
WE = 1.0um
WB = 0.2µm
Wc = 5um
%3D
Reference:
BJT Carrier Concentration Plots (Forward Active):
P++ (E)
N+ (B)
P+ (C)
p= N, = 1x101°cm
n= No = 1x10%cm
p= NA = 1x1014cm
n= n2/N, = 1x102cm
p= n?/N, = 1x10ʻcm
n= n2/NA = 1x10°cm
Base Width = W,
Min. Carrier Diffusion
Min. Carrier Diffusion
Length (LE) = (DN. t)2
Emitter-Base
Collector-Based
Length (Le) = (D,. t,)"2
(Fwd. Biased)
(Rev. Biased)
Emitter Maj. Carrier (h+): Injected to base -> diffuse across W, (some recombine (ls1) -> swept into collector by rev. bias CB
Junction -> hence small delta Vbe -> large delta lc .
Transcribed Image Text:Question: With reference to Figure below: (i) explain what is meant by the term 'emitter injection efficiency (Y), (ii) explain what is meant by the term 'base transport factor (a-)' and calculate the value of this parameter, (ii) explain what is meant by the term 'common base DC current gain (aDC)'and calculate the value of this parameter, (ii) explain what is meant by the term 'DC current gain (BDC) and calculate the value of this parameter for the structure shown. Base VBE (Fwd. Bias) VcB (Rev Bias) N++ P+ N Emitter Collector NE = 101°cm NB = 101°cm Nc = 101cm %3D %3D Y = 0.999 LB = WE = 1.0um WB = 0.2µm Wc = 5um %3D Reference: BJT Carrier Concentration Plots (Forward Active): P++ (E) N+ (B) P+ (C) p= N, = 1x101°cm n= No = 1x10%cm p= NA = 1x1014cm n= n2/N, = 1x102cm p= n?/N, = 1x10ʻcm n= n2/NA = 1x10°cm Base Width = W, Min. Carrier Diffusion Min. Carrier Diffusion Length (LE) = (DN. t)2 Emitter-Base Collector-Based Length (Le) = (D,. t,)"2 (Fwd. Biased) (Rev. Biased) Emitter Maj. Carrier (h+): Injected to base -> diffuse across W, (some recombine (ls1) -> swept into collector by rev. bias CB Junction -> hence small delta Vbe -> large delta lc .
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