Difference Amplifier Calculator

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

VC (Collector Voltage)V

VE (Emitter Voltage)V

VB (Base Voltage)V

IE (Emitter Voltage)mA

IC (Collector Voltage)mA

IB (Base Voltage)mA

gm (Transconductance)

Rπ (Input Resistance of BJT at low freq)Ω

reΩ

Rin (Input Resistance of Amp)KΩ

A (Amplifier Voltage Gain)

fp1MHz

fp2MHz

Equations :

V_B= VP*R2/(R1+R2)

V_E= V_B-V_BE

I_E=V_E/R_E

Alpha= Beta/(Beta+1)

I_C= Alpha * I_E

V_C= VP - I_C*R_C/2

I_B=I_C/Beta

g_m = I_C/25mA

r_e= Alpha/g_m

r_π= Beta/g_m

A=Alpha* r_π * R_C/(R_s+2*r_π)/r_e

f_P1=1/(2*π*(R_s||2*r_π)*(C_BE/2+C_BC))

f_P2=1/(2*π*R_C*C_BC)