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Differential Amplifier Online Calculator



App description

This calculator calculates the bias voltage and current, as well as the gain and frequency response.

Equations

VB= VP * R2/(R1+R2)

VE= VB-VBE

IE=VE/RE

Alpha= Beta/(Beta+1)

IC= Alpha * IE

VC= VP-IC * RC/2

IB=IC/Beta

gm = IC/25mA

re= Alpha/gm

rπ= Beta/gm

A=Alpha * rπ * RC/(Rs+2 * rπ)/re

fP1=1/(2 * π* (Rs||2 * rπ) * (CBE/2+CCB))

fP2=1/(2 * π * RC * CCB)

fT= gm/(2π*(CBE+CCB))

Usage example

R1=18KΩ,R2=3.9KΩ,RC=3KΩ,RE=3.4KΩ,VP=25V,Beta=100,VBE=0.6V,Rs=50Ω,RL=470Ω,fT=400MHz,CCB=2pF

Find the result according to the formula

Note

R1,R2RC,RE,the unit is KΩ

Rs,RL,the unit isΩ

 

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