Chapter 6 Differential and Multistage Amplifiers3

Chapter 6 Differential and Multistage Amplifiers3 - Chapter...

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Chapter 6 Differential and Multistage Amplifiers Introduction 6.1 The BJT differntial pair 6.2 Small-signal operation of the BJT differential amplifier 6.3 Other nonideal characteristics of the differential amplifier 6.4 MOS diffenrential amplifiers 6.5 Biasing in intergrated circuits 6.6 The BJT differential amplifier with active load 6.9 Multistage amplifiers
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The advantages of Widlar Current Sour ce Example6.2 p518 1. Widlar circuit allows the generation of a sm all constant current using relatively small r esistors( saving in chip area ). 2. Another important characteristic of the widl ar current source is that its output resistan ce is high. o E m o E m E o r R g r R g R R ) 1 ( ) 1 ( ' ' ' + 2245 + + =
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The Basic MOSFET Current Source 1 2 ) ) L W L W I I REF o = ( 29 ( 29 2 2 ' 2 1 2 1 ' 1 2 1 2 1 tn GS n D o GS DD REF D tn GS n D V V L W K I I R V V I I V V L W K I - = = - = = - =
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MOS Current-Steering Circuits 4 5 4 5 1 3 3 1 2 2 ) ( ) ( ) ( ) ( ) ( ) ( L W L W I I L W L W I I L W L W I I REF REF = = =
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The Wilson MOS Current Mirror 2 3 3 o o m o r r g R 2245
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Active Load Replace resistance R D with a constant current source results in a much high v oltage gain as well as saving in chip ar ea. Convert the output from differential to s
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Chapter 6 Differential and Multistage Amplifiers3 - Chapter...

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