Part III power amplifier circuits – Class ab



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  • Part III
  • Power amplifier circuits – Class AB
  • POWER AMPLIFIERS
  • Class-AB
  • POWER AMP
  • Qn & Qp are assumed matched transistors
  • Class-AB
  • POWER AMP
  • POWER AMP
  • The base-emitter of a BJT is basically a p-n junction and hence exhibits similar characteristics as that of a diode – voltage across a diode in a forward mode is almost constant over a range of the diode current.
  • Class-AB – Diode Biasing
  • POWER AMP
  • The above diode characteristic is utilised in biasing of the push-pull power amplifier
  • Class-AB – Diode Biasing
  • POWER AMP
  • Class-AB – Diode Biasing
  • POWER AMP
  • EXAMPLE 3
  • RL = 8 ;
  • output power to load, PL = 5 W;
  • peak output voltage to be not more than 80% of VCC;
  • minimum value of ID to be no less than 5 mA
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