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這個計算器計算偏置電壓和電流，以及增益和頻率響應。  R1 (KΩ)  R2 (KΩ) R C (Collector resistor)集電極電阻 (KΩ)  R E (Emitter resistor)發(fā)射極電阻 (KΩ)  VP (Supply Voltage)電源電壓 (V) Beta (DC Current Gain)直流電流增益 V BE (Base to emitter drop)基極-發(fā)射極壓降 (V) R s (Source Resistance): 電源內(nèi)阻 (Ω) R L (Load resistor)負載電阻 (Ω)  f T (Current Gain BW Product):電流增益帶寬 (MHz) C CB (Cu Collector-Base Cap.): 集電極與基極間電容 (pF) C BE (C π , Base-Emitter Cap.): 基極和發(fā)射極之間的電容(可選)   (pF)
V C (Collector Voltage)集電極電壓	(V)
V E (Emitter Voltage)發(fā)射極電壓	(V)
V B (Base Voltage)基極電壓	(V)
I E (Emitter Voltage)發(fā)射極電壓	(mA)
I C (Collector Voltage)集電極電壓	(mA)
I B (Base Voltage)基極電壓	(mA)
g m (Transconductance)跨導
r π (Input Resistance of BJT at low freq)晶體管輸入阻抗,低頻率的	(Ω)
r e	(Ω)
R IN (Input Resistance of Amp)放大器輸入阻抗	(KΩ)
A (Amplifier Voltage Gain)放大器的電壓增益
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 ))