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      差動放大器計算器

      R1 (KΩ) 
      R2 (KΩ)
      RC(Collector resistor)集電極電阻 (KΩ) 
      RE(Emitter resistor)發射極電阻 (KΩ) 
      VP(Supply Voltage)電源電壓 (V)
      Beta (DC Current Gain)直流電流增益
      VBE (Base to emitter drop)基極-發射極壓降 (V)
      Rs(Source Resistance): 電源內阻 (Ω)
      RL(Load resistor)負載電阻 (Ω) 
      fT(Current Gain BW Product):電流增益帶寬 (MHz)
      CCB(Cu Collector-Base Cap.): 集電極與基極間電容 (pF)
      CBE(Cπ, Base-Emitter Cap.):基極和發射極之間的電容(可選) (pF)

      VC(Collector Voltage)集電極電壓 (V) 
      VE(Emitter Voltage)發射極電壓 (V) 
      VB (Base Voltage)基極電壓 (V) 
      IE(Emitter Voltage)發射極電壓 (mA) 
      IC(Collector Voltage)集電極電壓 (mA) 
      IB (Base Voltage)基極電壓 (mA) 
      gm (Transconductance)跨導
      rπ (Input Resistance of BJT at low freq)晶體管輸入阻抗,低頻率的 (Ω)
      re  (Ω)
      RIN (Input Resistance of Amp)放大器輸入阻抗 (KΩ)
      A (Amplifier Voltage Gain)放大器的電壓增益
      fP1 (MHz)
      fP2 (MHz)

      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

       

      gm = Ic/25mA

      re= Alpha/gm

      rπ= Beta/gm

      A=Alpha* rπ*RC/(Rs+2*rπ)/re

      fP1=1/(2*π*(Rs||2*rπ)*(CBE/2+CBC))

      fP2=1/(2*π*RC*CBC)

       

      fT= gm/(2π*(CBE+CBC))

      The lower pole is dominate: 

       

      .

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