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Penguat Emiter Sekutu
Rangkaian Ekivalen
Resistansi Emiter AC
re’ = ∆Vbe / ∆Ie atau
re’ = vbe / ie
Harga pendekatan : re’ = 25mV / Ie
Beta AC = ∆Ic / ∆Ib
= ic / i b
Penguatan Tegangan
ie = vin / re’
ic ≈ ie
vout ≈ -ic.Rc
≈ - vin .RC / re’
A = vout / vin ≈ - RC / re’
Impedansi Masukan

zin(basis) = β.re’

zin = zin(basis) // R1 // R2
Impedansi Keluaran

zout ≈ RC
Contoh 7-1

re’ = 25mV / 1,1mA
= 22,7W
A = RC / re’
= -159

VB = 10V.2K2 / (10K + 2K2)
=1,8V
VE = VB – VBE
= 1,8V – 0,7V
= 1,1V
IE = V E / RE
= 1,1V / 1K
=1,1mA
VC = VCC – IC.RC
= 10V – 1,1mA.3K6
= 6,04V

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9 Penguat Emiter Sekutu