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BJT ‘Q’ Point (Bias Point)

  • Q point means Quiescent or Operating point

  • Very important for amplifiers because wrong ‘Q’ point

selection increases amplifier distortion

  • Need to have a stable ‘Q’ point, meaning the the operating

point should not be sensitive to variation to temperature or BJT β, which can vary widely

23

Four Resistor bias Circuit for Stable ‘Q’ Point

By far best circuit for providing stable bias point

24

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