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差分放大器计算器

差分放大器是一种常见的电路，用于放大两个输入信号之间的差异。以下是一个简单的差分放大器在线计算器，可以帮助您计算所需的电路元件值和电路输出参数。请注意：以下计算器的结果仅供参考。在实际设计电路时，您需要进一步验证参数，特别是与电源电压、增益、输入电阻和输出电阻等因素有关的参数。

This calculator calculates the bias voltage and current, as well as the gain and frequency response. 

R1 (KΩ) 
R2 (KΩ)
RC (Collector resistor) (KΩ) 
RE (Emitter resistor) (KΩ) 
VP (Supply Voltage) (V)
Beta (DC Current Gain)
VBE (Base to emitter drop) (V)
Rs (Source Resistance) (Ω)
RL (Load resistor) (Ω) 
fT (Current Gain BW Product) (MHz)
CCB (Cu Collector-Base Cap.) (pF)
CBE (Cπ , Base-Emitter Cap.): Capacitance between base and emitter (optional)  (pF)

VC (Collector Voltage) (V) 
VE (Emitter Voltage) (V) 
VB (Base Voltage) (V) 
IE (Emitter Voltage) (mA) 
IC (Collector Voltage) (mA) 
IB (Base Voltage) (mA) 
gm (Transconductance)
rπ (Input Resistance of BJT at low freq) (Ω)
re  (Ω)
RIN (Input Resistance of Amp) (KΩ)

　
A (Amplifier Voltage Gain)
fP1 (MHz)
fP2 (MHz)

Differential amplifier calculation formula:

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

　

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))
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