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)
RC (Collector resistor)集电极电阻 (KΩ) 
RE (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
VBE (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) 
fT (Current Gain BW Product):电流增益带宽 (MHz)
CCB (Cu Collector-Base Cap.): 集电极与基极间电容 (pF)
CBE (C π , Base-Emitter Cap.): 基极和发射极之间的电容(可选)   (pF)

VC (Collector Voltage)集电极电压 (V) 
VE (Emitter Voltage)发射极电压 (V) 
VB (Base Voltage)基极电压 (V) 
IE (Emitter Voltage)发射极电压 (mA) 
IC (Collector Voltage)集电极电压 (mA) 
IB (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)
RIN (Input Resistance of Amp)放大器输入阻抗 (KΩ)

 

A (Amplifier Voltage Gain)放大器的电压增益
fP1 (MHz)
fP2 (MHz)

差动放大器计算公式:

Equations

VB=  VP*R2/(R1+R2)

VE= VB-VBE

IE=VE/RE

Alpha= Beta/(Beta+1);

IC= Alpha*IE

VC= VP -  IC*RC/2

IB=IC/Beta

 

g m = Ic/25mA

r e = Alpha/g m

r π = Beta/g m

A=Alpha* r π *RC/(R s +2*r π )/r e

fP1 =1/(2*π*( Rs ||2*r π )*(C BE/2+C BC))

fP2 =1/(2*π* RC *C BC)

 

fT = g m /(2π*(C BE +C BC ))