EE5602_6_ARFaMT_POWERAMP

EE5602_6_ARFaMT_POWERAMP - Power Amplifier Design Class of...

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Unformatted text preview: Power Amplifier Design Class of Operation (conduction angle ) Class A ( = 360 o ), MAX = 50% Class AB (180 o < < 360 o ), MAX = 50-78.5% Class B ( = 180 o ), MAX = 78.5% Class C (0 o < < 180 o ), MAX = 78.5-100% Class E ( = 0 o ), MAX = 100% Difference Between Average and RMS Average value (dc component) Root Mean Square (effective value) = T average dt t f T F ) ( 1 = T RMS dt t f T F 2 ) ( 1 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 % 100 (max) = S L m P P 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? 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 Class B Power Amplifiers DC collector current Supply power Signal load power Maximum signal load power ( 29 = = 2 / sin 1 T CP CP CC I dt t I T I CC CP CC CC S V I V I P = = ( 29 [ ] 4 sin ' 2 2 / 2 ' L CP T CP L L R I t d t I T R P = = ' 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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This note was uploaded on 01/11/2011 for the course EE 5602 taught by Professor Wingshingchan during the Spring '10 term at City University of Hong Kong.

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EE5602_6_ARFaMT_POWERAMP - Power Amplifier Design Class of...

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