NNAI – practice L2 BJT differential amplifier

Main parameters of used transistors: NPN: Is = A  = 100 Output characteristic slope in active region = 0.5 μA/V at Ic=30uA (V E =60V) PNP: Is = A  = 50 Output characteristic slope in active region 1 μA/V při Ic=30uA (V E =30V) Nore: precise V T for T=300K is mV Spice models can be find at

Need of matching !!!!! Variance of the „hipo“ R over process and temperature in AMIS CMOS07: R hipotyp = 2000 Ω/□ R hipomin = 1600 Ω/□ R hipomax = 2400 Ω/□ tc 1 = tc 2 = Variance Rhipo [Ω/□] pro t = (0-90)°C

1 Design bipolar differential stage with transconductance gm:

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2 Determine input voltage asymmetry of the BJT differential stage knowing that due to the lithography variance the ratio of the BJT emitter areas is 1,1.  means: I s1 = 1.1 I s2 Make sure the input offset is not I SS dependent…

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3 Design differential output amplifier and gain A=10 Its quiescent current consumption is 40μA. V C = 5V -suppose V be = 0.65V

3 To satisfy demand of current consumption For voltage GAIN: Simulation  PSpice

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9 BG oblouček