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Load line analysis of BJT and its Stability

Descriptive Load line analysis of BJT and its Stability

chandrasatish1989
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Load line analysis of BJT and its Stability

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  1. Load line analysis of BJT and its Stability AC load line Presentation for the faculty position (ECE)

  2. (b) Transistor is driven in saturation because Q-point too close to saturation region (a) Transistor is acting as amplifier because Q-point is middle of saturation and cut off region (d) Transistor is driven into both saturation and cutoff because the input signal is too large (c) Transistor is driven in cut off region because Q-point too close to cut-off region Presentation for the faculty position (ECE)

  3. After selection of Q-point, it must be remained fixed to have amplified signal without clipping Some important equations (1) (2) where, (3) Here, , and are very responsive towards any temperature variation. So, We need to define arrangement to make Q-point fixed (i.e., biasing) and check it stability by stability factor (S) (4) From (2), (5) Presentation for the faculty position (ECE)

  4. Fixed bias circuit Collector to base biasing Potential divider biasing ⇒ Therefore, or ⇒ Therefore, ⇒ Therefore, Presentation for the faculty position (ECE)

  5. The best Q-point for the operation of a transistor as an amplifier is that point,  which lies in the middle of the load line. • The purpose of biasing is to establish the operating point(Q-point). • Potential divider biasing is best biasing circuit amongst all three biasing. • independent of β Presentation for the faculty position (ECE)

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