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Lecture 22

Lecture 22 - Lecture 22 Differential Amplifiers General...

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1 Lecture 22 – Slide 1 EE105, Fall 2013 Prof. Ming C. Wu Lecture 22 § Differential Amplifiers General considerations BJT differential pair Qualitative analysis Large-signal analysis Small-signal analysis Frequency response § Reading: Chapter 10.1-10.2 Lecture 22 – Slide 2 EE105, Fall 2013 Prof. Ming C. Wu Humming ’Noise’in’Audio’Amplifer’ § Consider’the’amplifer’below’which’amplifes’an’audio’signal’ From’a’microphone.’ § IF’the’power’supply’( V CC )’is’?me-varying,’it’will’result’in’an’ addi?onal’(undesirable)’voltage’signal’at’the’output,’ perceived’as’a’ humming ’noise’by’the’user.’ out CC C C VVI R =

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2 Lecture 22 – Slide 3 EE105, Fall 2013 Prof. Ming C. Wu Supply’Ripple’Rejec?on’ § Since’node’X’and’Y’each’see’the’voltage’ripple,’their’voltage’ diference’will’be’Free’oF’ripple.’ in v Y X r Y r in v X v A v v v v v v A v = = + = Lecture 22 – Slide 4 EE105, Fall 2013 Prof. Ming C. Wu Ripple-±ree’Diferen?al’Output’ § IF’the’input’signal’is’to’be’a’voltage’diference’between’two’ nodes,’an’ampli²er’that’senses’a’ diferen(al signal is’ needed.’
3 Lecture 22 – Slide 5 EE105, Fall 2013 Prof. Ming C. Wu Common’Inputs’to’Diferen?al’Amp. § The’voltage’signals’applied’to’the’input’nodes’oF’a’ diferen?al’ampli±er’cannot’be’in’phase;’otherwise,’the’ diferen?al’output’signal’will’be’zero.’ 0 = + = + = Y X r in v Y r in v X v v v v A v v v A v Lecture 22 – Slide 6

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Lecture 22 - Lecture 22 Differential Amplifiers General...

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