22 - ECSE 334 Introduction to Microelectronics Roni Khazaka...

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1 ECSE334 – Introduction to Microelectronics ECSE 334 Introduction to Microelectronics Roni Khazaka Lecture #23 ECSE334 – Introduction to Microelectronics 2 Khazaka - 2008 Class AB Amplifier: Quiescent Point R L o v CC V + CC V I v 2 BB V 2 BB V N Q P Q Quiescent Operating Point: V 0 = I v V 0 = o v Assuming Matched Transistors: 2 BB EBp BEn V v v = = N i P i L i A 0 = L i P N i i = Q V V S V v S P N I e I e I i i T BB T BE = = = = 2
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2 ECSE334 – Introduction to Microelectronics 3 Khazaka - 2008 Class AB Amplifier: Circuit Operation R L o v CC V + CC V I v 2 BB V 2 BB V N Q P Q Positive Input: V 0 > I v BEn BB I o v V v v + = 2 BB EBp BEn V v v = + N i P i L i L o L R v i = L P N i i i + = ECSE334 – Introduction to Microelectronics 4 Khazaka - 2008 Class AB Amplifier: Circuit Operation R L o v CC V + CC V I v 2 BB V 2 BB V N Q P Q N i P i L i T BEn V v S N e I i = = S N T BEn I i V v ln T EBp V v S P e I i = = S P T EBp I i V v ln T BB V V S Q e I I 2 = = S Q T BB I I V v ln 2
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3 ECSE334 – Introduction to Microelectronics 5 Khazaka - 2008 Class AB Amplifier: Circuit Operation R L o v CC V + CC V I v 2 BB V 2 BB V N Q P Q BB EBp BEn V v v = + N i P i L i L P N i i i + = = + S Q T S P T S N T I I V I i V I i V ln 2 ln ln Q P N I i i = 0 2 2 = Q N L N I i i i ECSE334 – Introduction to Microelectronics 6 Khazaka - 2008 Class AB Amplifier: Power Dissipation R L o v CC V + CC V I v 2 BB V 2 BB V N Q P Q N i P i L i Same analysis as class B except for quiescent power. 0 = = o I v v Q CC Q I V P 2 = Must be included in power budget of transistors
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4 ECSE334 – Introduction to Microelectronics 7 Khazaka - 2008 Class AB Amplifier: Output Resistance N Q P Q o R ep en o r r R || = N T en i V r = P T ep i V r = N i P i N P T P T N T o
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22 - ECSE 334 Introduction to Microelectronics Roni Khazaka...

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