EE3110 AECL6_Power Amplifiers_2007rev1

# EE3110 AECL6_Power Amplifiers_2007rev1 - 6 PowerAmplifiers...

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6             Power Amplifiers     6.1        Difference between Average and RMS     Average value (d.c. component) :  = T average dt t f T F 0 ) ( 1 Root Mean Square (effective value) :  = T RMS dt t f T F 0 2 ) ( 1 6.2        Power Amplifier Classification     Class A Class AB Class B

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Class C
6    .3        Conduction Angle     Class A : 360 o Class AB: >180 o , < 360 o Class B : 180 o Class C : < 180 o Class AB Push Pull: 360 o Class B Push Pull : 360 o 6.4        Efficiency     Item Class Conductio n angle Maximu m efficienc y 1 A 360 o 50% 2 AB 180 o  -360 o 50-78.5% 3 B 180 o 78.5% 4 C 0-180 o >78.5%

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6    .5        Power Amplifier Parameters     6.5.1 Transistor Parameters BJT common emitter forward current transfer ratio =  β 0 BJT common base forward current transfer ratio =  β 0 FET parameters similar to small signal parameters 6.5.2 Power Signal load power :  ( 29 L o L R eff i P × = 2 Supply power :  CC CC S V I P = 6.5.3 Efficiency  η % 100 × = S L P P η Maximum efficiency :  % 100 (max) × = S L m P P η
6.5.4 Design of Power Amplifiers

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