Hello, I'm new here. Please let me know whatever or not I can post here.
I'm still learning circuits and need help. I'm stuck on configuring the 2nd stage of my multistage BJT amplifier. The problem is understanding the headrooms for the circuit. After this, I can do the first stage.
Specifications of mutistage Amplifier:
30 Gain
8 Ω load
600 mVpk output
Linear so that harmonic distortion is under 25 dB
input inpedance > 50 kΩ
Supply voltage 5 V
Must not be greater than 3 stages
Using these specifications, I decided to use 3 stages: a CE, CE, and CC. The 3rd stage (common-collector) is a buffer with gain of near 1. The 1st stage has a gain of 6, and the second stage has a gain of 5.
Working backwards, the 3rd stage is done. Now, I am on my second stage. This is where the problem occurs. The input inpedance going into stage 3 and the load of stage 2 is 675.26 Ω. The output voltage swing of stage 2 is 610 mVpk.
Attached contains what I got so far for calculations.
I'm still learning circuits and need help. I'm stuck on configuring the 2nd stage of my multistage BJT amplifier. The problem is understanding the headrooms for the circuit. After this, I can do the first stage.
Specifications of mutistage Amplifier:
30 Gain
8 Ω load
600 mVpk output
Linear so that harmonic distortion is under 25 dB
input inpedance > 50 kΩ
Supply voltage 5 V
Must not be greater than 3 stages
Using these specifications, I decided to use 3 stages: a CE, CE, and CC. The 3rd stage (common-collector) is a buffer with gain of near 1. The 1st stage has a gain of 6, and the second stage has a gain of 5.
Working backwards, the 3rd stage is done. Now, I am on my second stage. This is where the problem occurs. The input inpedance going into stage 3 and the load of stage 2 is 675.26 Ω. The output voltage swing of stage 2 is 610 mVpk.
Attached contains what I got so far for calculations.
Attachments
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