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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 Amplifier § Consider the amplifier below which amplifies 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 V V I 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 difference 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-­‐Free Differen?al Output § If the input signal is to be a voltage difference between two nodes, an amplifier that senses a differen(al signal is needed.
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3 Lecture 22 – Slide 5 EE105, Fall 2013 Prof. Ming C. Wu Common Inputs to Differen?al Amp. § The voltage signals applied to the input nodes of a differen?al amplifier cannot be in phase; otherwise, the differen?al output signal will be zero. 0
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