lec22 - 6.012 - Electronic Devices and Circuits Lecture 22...

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6.012 - Electronic Devices and Circuits Lecture 22 - Bounding the Mid-band Range - Outline Announcements Handouts - Lecture Outline and Summary Design Problem - Due next week Wed.; answer sheet posted after Lec. Review - Multistage amplifiers; Specialty stages Cascaded gain stages: r in ,r out interplay; bias compatibility Specialized output stages: push-pull vs. emitter-follower (quiescent power) The Miller effect: why C m and C gd are so important The concept: the consequences of having a capacitor shunting a gain stage Examples: common-emitter/-source stages common-base/gate stages; emitter-/source-followers the m A 741 - stabilizing a high gain circuit Bounding mid-band - finding w HI , w LO Method of open circuit time constants: finding w HI (How high can we fly?) Method of short circuit time constants: finding w LO (How low can we go?) The lesson of the OCTC and SCTC methods: which capacitors matter Clif Fonstad, 11/03 Lecture 22 - Slide 1
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Multi-stage Amplifier Analysis - half-ckt w. full LEC Difference-mode half circuit - mixes schematic and LEC elements; OK for intuition, but not for computation. v od + - v id /2 + - Q 6 Q 12 Q 16 Q 9 Q 14 R 3 r oQ22 r oQ23 r eLLdm r eCMdm ll i lf ci it i l solution + - g v g g v + - v + - v - g v g +2g + - id /2 R 3 - 2g v g +2g Fu LEC d ff-mode ha rcu (f rst 3 stages on y) - one approach to a full analytical m9 gs9 o9 o22 gs9 gs12 gs6 m6 gs6 o6 o2 m12 gs12 o11 o12 Clif Fonstad, 11/03 Lecture 22 - Slide 2 v
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Multi-stage Amplifier Analysis - Two-port analysis 2-port representation of stages - another powerful general approach to a full analytical solution (discussed in recitations) r out r in A v v in + - + - g v g g v + - v R 3 + - v i m9 gs9 o9 o22 gs9 outS2 nS2 Application to design problem analysis (first 3 stages only) - r out1 r in1 A v1 v in1 + - r out2 r in2 A v2 v i + - r out3 r in3 A v3 v i + - n2 n3 Clif Fonstad, 11/03 Lecture 22 - Slide 3
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i • Bounding mid-band : frequency range of constant gain and phase g p + - v p + - v in v t + - r t g m v p g o + - v g r I BIAS C E C p out LOAD C m C O Common I BIAS V + v out + - v in + - C E C O em tter
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This note was uploaded on 07/20/2009 for the course CSAIL 6.012 taught by Professor Prof.cliftonfonstadjr. during the Fall '03 term at MIT.

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lec22 - 6.012 - Electronic Devices and Circuits Lecture 22...

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