Hello
When one design preamplifier using BJT voltage-divider unbupassed Emitter config, one want max symetrical signal swing at the collector. To do this, VCE = 0.5 VCC &
I (saturation) = 2 IC = VCC/(RC+RE)
If I want a voltage gain = A, then
A= RC/(RE+re), where re = 0.026/IE, so
RC = A(RE+re) --------------(eq.1)
as said before, for max symetrical signal swing at the collector,
2 IC = VCC/(RC+RE) ==>
RC = (VCC/2IC) - RE ------(eq.2)
From (eq.1) & (eq.2) we get:
A(RE+re)= (VCC/2IC) - RE, solvig for RE yields:
RE = {VCC/2(1+A)IC} - (A/A+1)re
question #1: Is there any error in either equations or concepts
If yes, corrected me, please
When one design preamplifier using BJT voltage-divider unbupassed Emitter config, one want max symetrical signal swing at the collector. To do this, VCE = 0.5 VCC &
I (saturation) = 2 IC = VCC/(RC+RE)
If I want a voltage gain = A, then
A= RC/(RE+re), where re = 0.026/IE, so
RC = A(RE+re) --------------(eq.1)
as said before, for max symetrical signal swing at the collector,
2 IC = VCC/(RC+RE) ==>
RC = (VCC/2IC) - RE ------(eq.2)
From (eq.1) & (eq.2) we get:
A(RE+re)= (VCC/2IC) - RE, solvig for RE yields:
RE = {VCC/2(1+A)IC} - (A/A+1)re
question #1: Is there any error in either equations or concepts
If yes, corrected me, please
