这个计算器计算偏置电压和电流，以及增益和频率响应。  R1 (KΩ)  R2 (KΩ) R C (Collector resistor)集电极电阻 (KΩ)  R E (Emitter resistor)发射极电阻 (KΩ)  VP (Supply Voltage)电源电压 (V) Beta (DC Current Gain)直流电流增益 V BE (Base to emitter drop)基极-发射极压降 (V) R s (Source Resistance): 电源内阻 (Ω) R L (Load resistor)负载电阻 (Ω)  f T (Current Gain BW Product):电流增益带宽 (MHz) C CB (Cu Collector-Base Cap.): 集电极与基极间电容 (pF) C BE (C π , Base-Emitter Cap.): 基极和发射极之间的电容(可选)   (pF)
V C (Collector Voltage)集电极电压	(V)
V E (Emitter Voltage)发射极电压	(V)
V B (Base Voltage)基极电压	(V)
I E (Emitter Voltage)发射极电压	(mA)
I C (Collector Voltage)集电极电压	(mA)
I B (Base Voltage)基极电压	(mA)
g m (Transconductance)跨导
r π (Input Resistance of BJT at low freq)晶体管输入阻抗,低频率的	(Ω)
r e	(Ω)
R IN (Input Resistance of Amp)放大器输入阻抗	(KΩ)
A (Amplifier Voltage Gain)放大器的电压增益
f P1	(MHz)
f P2	(MHz)

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 = Ic/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 )

　

f _T = g _m /(2π*(C _BE +C _BC ))