EE3110 AECL6_Power Amplifiers_2007rev1

EE3110 AECL6_Power - 6 Power Amplifiers 6.1 Difference between Average and RMS Average value(d.c component = T average dt t f T F 1 Root Mean

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Unformatted text preview: 6 Power Amplifiers 6.1 Difference between Average and RMS Average value (d.c. component) : ∫ = T average dt t f T F ) ( 1 Root Mean Square (effective value) : ∫ = T RMS dt t f T F 2 ) ( 1 6.2 Power Amplifier Classification Class A Class AB Class B 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% 6 .5 Power Amplifier Parameters 6.5.1 Transistor Parameters BJT common emitter forward current transfer ratio = β BJT common base forward current transfer ratio = β 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 Amplifiers6....
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This note was uploaded on 01/11/2011 for the course EE 3110 taught by Professor Wingshingchan during the Fall '08 term at City University of Hong Kong.

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EE3110 AECL6_Power - 6 Power Amplifiers 6.1 Difference between Average and RMS Average value(d.c component = T average dt t f T F 1 Root Mean

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