Hi I am trying to design a CE Amplifier with a spec as so, so far I have got the working shown below, but I have two problems, it dosent get me the lower cut off freq I desire (40hz) and two of my capacitors CL and Ce have no effect on my lower cut off no matter what vlaues I put into them which seems wrong. Could someone run through my theory so far and point out where I may be going wrong?
Circuit I refer to (their values are different)
http://www.ecircuitcenter.com/Circuits/trce/trce.htm
My spec
Voltage gain: at least 20 dB at mid-band into 600 Ω
Frequency response:
Lower cut-off frequency: 40 Hz
Upper cut-off frequency: 1 MHz
Input impedance: 600 Ω ± 10%
Output impedance: 600 Ω ± 10%
DC supply voltage: 12 V
DC supply current: not more than 15 mA
Output power: not less than 2.0 mW into 600 Ω at mid-band.
Note : thanks for Caveman for his help so far in explaining to me how the circuit works
My Calcs are below
Circuit I refer to (their values are different)
http://www.ecircuitcenter.com/Circuits/trce/trce.htm
My spec
Voltage gain: at least 20 dB at mid-band into 600 Ω
Frequency response:
Lower cut-off frequency: 40 Hz
Upper cut-off frequency: 1 MHz
Input impedance: 600 Ω ± 10%
Output impedance: 600 Ω ± 10%
DC supply voltage: 12 V
DC supply current: not more than 15 mA
Output power: not less than 2.0 mW into 600 Ω at mid-band.
Note : thanks for Caveman for his help so far in explaining to me how the circuit works
My Calcs are below