written 7.3 years ago by |
Step 1: Circuit Diagram

Step 2: Finding Vcc
Vcc=2VCEQ
Vcc = 10V
Step 3: Finding RE
VRE=10
VRE=1V
We know that,
VRE=IERE
Finding IE,
IC=βIB
IB=IC/β=5mA/100………………..Ic=5mA(Given)
IB=50μA
IE=IB+IC
IE=5mA+50μA
IE=5.05mA
VRE=IERE
1V=5.05mA×RE
RE=198.01Ω
Step 4: Finding RC
Apply KVL from Vcc to Gnd through collector emitter,
Vcc−ICRC−VCEQ−VRE=0
10V–(5mA×RC)–5V–1V=0
RC=800Ω
Step 5: Finding R1 and R2
I1=10IB
I1 = 500µA
Apply KCL at base of transistor,
I2 = I1 - I_B
I2 = 500\mu A-50\mu A
I2= 450\mu A
Apply KVL from R2 to ground through base to emitter,
V_{R2} – V_{BE} – V_{RE} = 0
V_{R2} = 0.7V + 1V ……………Assume V_{BE}=0.7V
V_{R2}= 1.7V
Hence,
V_{R2} = I2 R2
1.7V = 450\mu A\times R2
R2= 3.77K\Omega
R1=\frac{Vcc-V_R2}{I1}
R1=\frac{10V-1.7V}{500\mu A}
R1=16.6K\Omega
Step 6: Designed Circuit Diagram
