walid Posted October 30, 2010 Report Share Posted October 30, 2010 HelloWhen 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, thenA= RC/(RE+re), where re = 0.026/IE, soRC = 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)requestion #1: Is there any error in either equations or conceptsIf yes, corrected me, please Quote Link to comment Share on other sites More sharing options...
walid Posted October 30, 2010 Author Report Share Posted October 30, 2010 I wait Quote Link to comment Share on other sites More sharing options...
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