App description

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

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

VC= 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* (Rs||2 * rπ) * (C_BE/2+C_CB))

f_P2=1/(2 * π * R_C * C_CB)

f_T= g_m/(2π*(C_BE+C_CB))

Usage example

R1=18KΩ，R2=3.9KΩ，R_C=3KΩ，R_E=3.4KΩ，VP=25V，Beta=100，V_BE=0.6V，R_s=50Ω，R_L=470Ω，f_T=400MHz，C_CB=2pF

Find the result according to the formula

Note

R1，R2R_C，R_E，the unit is KΩ

R_s，R_L，the unit isΩ

 

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