I have to design a Common Emitter Amplifier using a 2N2222 NPN transistor and an 18V DC supply.
- The specifications are as follows:
- Should be stable for variations in forward current gain, β.
- The input signal to the amplifier is a 0.2 Vp sinusoidal signal, at a frequency of 50 kHz.
- The amplifier should have an undistorted, symmetrical output with an 8 Vpp swing.
- The output should be maintained over a bandwidth of at least 1 kHz – 10 MHz.
- The quiescent current is to be 6 mA, at a quiescent collector-emitter potential of 8 V
- Assume the load impedance is much larger than the output impedance of your amplifier.
- Ensure the power dissipation of the transistor is kept below maximum operating limits.
The Attempt at a Solution
I designed the circuit to be as follows:
Vcc=18V, Vce=8V, Ve=(1/10)Vcc=1.8V, Ic=6mA
Vb=(Vcc*R2)/(R1+R2) -- (1)
Vb=Vbe+Ve, Vbe=0.7V, Ve=1.8V
so, R1=18.6kΩ, R2=3kΩ, Rc=1.36kΩ, Re=300Ω
Is this correct?
I think I have to add an un-bypassed resistor to the emittor side.
Also how do I find the values for R5, and the 3 capacitors.
Thank you for the help
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