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Class 15

V S+. R C. R 3. ∞. ∞. T2. v out. C L. R L. R 2. ∞. T1. R 1. v in. C E = ∞. R E. Class 15. Cascode amplifiers - Normal cascode a mplifier Amplifier parameters High frequency behaviour. V S+. ∞. T1. R B. ∞. v in. T2. ∞. I B0. C L. v out. R C. R L. V S-. Class 15.

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Class 15

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  1. VS+ RC R3 ∞ ∞ T2 vout CL RL R2 ∞ T1 R1 vin CE=∞ RE Class 15 • Cascode amplifiers • - Normal cascode • amplifier • Amplifier parameters • High frequency behaviour

  2. VS+ ∞ T1 RB ∞ vin T2 ∞ IB0 CL vout RC RL VS- Class 15 • - Complementary cascode amplifier • Amplifier parameters • High frequency behaviour

  3. Class 15 • POWER AMPLIFIERS • Specific parameters: • - maximum output voltage swing • - supply power • - output power • - dissipated power • - efficiency • - calculation of the thermal conditions

  4. VS RL IC0 = = RE -VS RE x RL -VSRL/(RE+RL) Class 15 • Powers in a CC amplifier • Supply reduction

  5. RDC=RAC=RExRL t vCEp IC =/~ iCp IC0 t VCE VCE0 =VS V+ = VS V-=IC0 RAC Class 15 • What happens in the IC - VCE system?

  6. Class 15 • Supply (average) power • Output power • Dissipated power and its maximum • Maximum output swing • Maximum efficiency • Optimum efficiency

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