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EE5602_6_ARFaMT_POWERAMP - Power Amplifier Design Class of...

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Power Amplifier Design
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Class of Operation (conduction angle θ ) Class A ( θ = 360 o ), η MAX = 50% Class AB (180 o < θ < 360 o ), η MAX = 50-78.5% Class B ( θ = 180 o ), η MAX = 78.5% Class C (0 o < θ < 180 o ), η MAX = 78.5-100% Class E ( θ = 0 o ), η MAX = 100%
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Difference Between Average and RMS Average value (dc component) Root Mean Square (effective value) = T average dt t f T F 0 ) ( 1 = T RMS dt t f T F 0 2 ) ( 1
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Power Amplifier Parameters Power Signal load power Supply power Efficiency Operating efficiency Maximum efficiency ( 29 L o L R eff i P × = 2 CC CC S V I P = % 100 × = S L P P η % 100 (max) × = S L m P P η
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Designing Power Amplifiers Depends on requirements, but briefly, Signal load power Supply power Power dissipated by transistor – V CE (max), V DS (max), I C (max), I D (max) During the design you will probably need to determine, DC biasing, DC load-line and AC load-line Gain Efficiency Linearity Noise?
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Inductively Coupled Class A Power Amplifier Quiescent collector current Maximum signal load power Supply power Maximum efficiency L CC CQ R V I = L CQ L R I P × = 2 2 (max) CC CQ S V I P = % 50 % 100 (max) = × = S L m P P η
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Class B Power Amplifiers DC collector current Supply power Signal load power Maximum signal load power ( 29 = = 2 / 0 sin 1 T CP CP CC I dt t I T I π ϖ π CC CP CC CC S V I V I P = = ( 29 [ ] 4 sin ' 2 2 / 0 2 ' L CP T CP L L R I t d t I T R P = = ϖ ' 2 ' 2 ' ' 2 4 4 4 (max) L CC L L CC L CP L R V R R V R I P = = =
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Maximum efficiency Power dissipated Maximum power dissipated, set derivative to zero % 5 . 78 % 100 (max) = × = S L m P P η ' 2 ' ' 2 4 4 L OP L OP CC L CP CC CP L S diss R V R V V R I V I P P P - = - = - = π π π π CC OP L OP L CC OP
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