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 ))