EE 435 Lect 7 Spring 2010

EE 435 Lect 7 Spring 2010 - EE 435 Lecture 7: High-Gain...

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1 EE 435 Lecture 7: High-Gain Single-Stage Op Amps
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2 Signal Swing How do the transfer characteristics relate to the signal swing ? iN V For this circuit, high gain and large output signal swing for small V EB1 Review from last lecture:
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3 Signal Swing of Single-Stage Op Amp V DD V SS V OUT V 1 V 2 M 1 M 2 M 3 M 4 M 5 V XX For high-gain amplifiers, V d is inherently very small so are only concerned about output signal swing vs V iC iC V OUT V CC V CC V SS V SS Generally large swings come at expense of other desirable characteristics Review from last lecture:
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4 Signal Swing of Single-Stage Op Amp iC V V OUT V CC V CC V SS V SS iC V iC V Wide V iC and V OUT range Narrow V iC and wide V OUT range What type of signal swing is needed ? iC V Narrow V OUT and wide V iC range Narrow V iC and V OUT range Expected for catalog parts and overall I/O in many applications Acceptable when ViC is fixed Acceptable when followed by high-gain stage Acceptable when V iC fixed and followed by high-gain stage Review from last lecture:
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5 Signal Swing of Single-Stage Op Amp SS SS DD DD OUT 1 1 T2 V T1 EB1 EB5 VV V ++ EB4 V EB3 T3 T1 V +− iC V L 1 L 2 L 3 L 4 Review from last lecture:
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6 Design space for single-stage op amp + = EB1 3 1 0 V 2 λ λ 1 A 3 3 1 EB T T DD iC V V V V V + < = EB1 L DD V 2 C V P GB Performance Parameters in Practical Parameter Domain { V EB1 V EB2 V EB5 P}: EB3 DD OUT V V V < T2 ic OUT V V V > SS EB5 EB1 T1 ic V V V V V + + + > Simple Expressions in Practical Parameter Domain () DD SS L P SR VV C = Review from last lecture:
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7 Design space for single-stage op amp 1 nO X 1 V0 13 T W 4 μ C L A λλ I ⎛⎞ ⎜⎟ ⎡⎤ = ⎢⎥ + ⎣⎦ ⎝⎠ T iC DD T1 T3 3 pO X 3 I V < V + V - V - W μ C L Performance Parameters in Natural Parameter Domain { W 1 /L 1 W 3 /L 3 W 5 /L 5 I T }: T OUT DD 3 X 3 I VV W μ C L <− T2 ic OUT V V V > TT ic T1 SS 15 X X 1 5 II + V WW μ C μ C L L >+ + Complicated Expressions in Practical Parameter Domain X 1 T L1 μ C W GB I CL = T L I SR C = Review from last lecture:
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8 Measurement and Simulation of Op Amps Measurement of A V is challenging Because it is so large Even harder as A V0 becomes larger Offset voltage causes a problem Embed in Feedback Network to Stabilize Operating Point Stability must be managed Use time varying input to distinguish signal information from offset Must be well below first pole frequency Measurement challenges often parallel simulation challenges Measurement of GB is easy Measurement of R 0 is challenging
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9 Single-stage op amps + = EB1 3 1 V0 V 1 λ λ 1 A Question – is the gain achievable with the single-stage op amps considered so far adequate?
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This note was uploaded on 01/31/2012 for the course EE 345 taught by Professor Geiger during the Fall '11 term at Iowa State.

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EE 435 Lect 7 Spring 2010 - EE 435 Lecture 7: High-Gain...

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