Part III power amplifier circuits – Class ab


Class-AB with Input Buffer Transistors



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Class-AB with Input Buffer Transistors
  • POWER AMP
  • Neglecting and
  • we have;
  • and;
  • Class-AB with Input Buffer Transistors
  • POWER AMP
  • If;
  • and;
  • then;
  • Class-AB with Input Buffer Transistors
  • POWER AMP
  • which is quite substantial. A large current gain is desirable since the output stage must meet the power requirements.
  • Class-AB with Input Buffer Transistors
  • POWER AMP
  • EXAMPLE 4
  • Determine the quiescent bias currents in all transistors;
  • Calculate all the currents labeled in the figure and the current gain when vI = 10 V.
  • Class-AB with Input Buffer Transistors
  • POWER AMP
  • EXAMPLE 4 – Solution
  • (a) For vI = 0 (quiescent currents);
  • Class-AB with Input Buffer Transistors
  • POWER AMP
  • EXAMPLE 4 – Solution (cont’d)
  • (b) For vI = 10;
  • Because the voltage gain is approx. unity;
  • Class-AB with Input Buffer Transistors
  • POWER AMP
  • EXAMPLE 4 – Solution (cont’d)
  • Class-AB with Input Buffer Transistors
  • POWER AMP
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