Simple RTL gates invertor - University of Florida
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lecture07.pdfTo calculate rE, need quiescent value for Ic
rE = 50 ohm, ac gain = -20k/50 = 400 (not infinite)
Miller effect Decrease of gain at high frequency due to Cbc
Cbc
High or Low pass?
RCf db π2 1
In common emitter amplifier, Cbc is not connected to ground
Gain = -RC/RE
Vcapacitor = Vb - Vc = (1+|Gain|)Vin
Q = Cbc Vcapacitor = Cbc(1+|Gain|)Vin
Rc
RE
Vcc
capacitance appears much larger Miller effect: f3db lowered by (1+|Gain|)
Cbc
rE = 50 ohm, ac gain = -20k/50 = 400 (not infinite)
Miller effect Decrease of gain at high frequency due to Cbc
Cbc
High or Low pass?
RCf db π2 1
In common emitter amplifier, Cbc is not connected to ground
Gain = -RC/RE
Vcapacitor = Vb - Vc = (1+|Gain|)Vin
Q = Cbc Vcapacitor = Cbc(1+|Gain|)Vin
Rc
RE
Vcc
capacitance appears much larger Miller effect: f3db lowered by (1+|Gain|)
Cbc
