Amplifier circuits
As I'm studying for my 3rd class Amateur radio certificate[1] in Japan[2], I wanted to write down some notes on amplifier circuits.
Amplifier types
Common emitter amplifier
In Japanese, this called エミッタ接地増幅回路[3].
Falstad circuit emulator text[4]:
$ 1 0.000005 13.097415321081861 66 5 50 5e-11 t 208 208 288 208 0 1 -6.335290598254659 0.6267237961459291 100 default r 288 192 288 96 0 1200 r 208 208 208 96 0 20000 w 208 96 288 96 0 v 96 352 96 208 16 1 100 1 0 0 0.5 c 208 208 96 208 4 0.000003 1.3999061550528193 0.001 0 w 96 352 208 352 0 c 336 224 336 352 4 0.0000022999999999999996 1.0340239322574427 0.001 0 w 336 352 416 352 0 p 416 192 416 352 3 0 0 10000000 R 416 96 448 96 0 0 40 12 0 0 0.5 w 288 96 416 96 0 207 416 192 448 192 4 Vout g 288 352 288 384 0 0 w 416 192 288 192 0 w 336 352 288 352 0 r 288 224 288 352 0 220 w 288 224 336 224 0 207 416 352 448 352 4 0v r 208 208 208 352 0 3600 w 208 352 288 352 0 o 4 64 0 x281012 8.250148878587748 0.0001 0 3 0 20 0 4 3 Infinity 0 9 0 500 0
Observations:
- The output voltage is 180 degrees out of phase with the input voltage.
- Increasing the AC frequency from 100 Hz to 1000 Hz introduces clipping on the output.