03-Bandgap Reference - Reference Chern-Lin Chen ( )...

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Chern-Lin Chen ( ) Department of Electrical Engineering & Graduate Institute of Electronics Engineering National Taiwan University e-mail - clchen@cc.ee.ntu.edu.tw office tel – +886-2-3366-3575 Reference Mar. 9, 2010
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1 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 A Generic Mixed-Signal System Amp Amp DAC ADC DSP / μ P Clocks & Timers Interface Power Management V REF V REF V REF
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2 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Voltage Sensitivity REF DD REF V REF V DD DD V V S V V = Bandgap Circuit V DD V REF To reduce VS - regulate V DD -e n h a n c e PSRR
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3 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Temperature Coefficient () REF REF REF V V TC V T = Bandgap Circuit V DD V REF environment temperature To lower TC - improve circuit design
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4 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Concept of Low TC Voltage Reference Base-emitter voltage(V BE ) Generator Thermal voltage(V T ) Generator Temperature-independent scalar(K) Σ REF BE T VV K V = negative TC positive TC
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5 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Negative – TC Voltage + V BE _ 2.2 BE o V mV K T ≈− () [] -l n BE GO BE r GO t rr TT VV V T V V ηβ =+ + ⎡⎤ ⎣⎦
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6 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 NTC Current Generator I NTC I NTC I NTC
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7 Power ICS Laboratory 功率積體電路與系統實驗室 Chern-Lin Chen 陳秋麟 National Taiwan University 國立台灣大學 Positive TC Voltage () 11 2 12 1 2 1 2 22 1 ln ln ln BE BE BE BE BE qV qV qV KT KT KT cs s c s q VV KT c c c BE BE c cc BE BE BE T iI e I e i I e i e i i q iK T ii KT V V qi i ⎛⎞ =− ⎜⎟ ⎝⎠ = Δ=
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This note was uploaded on 10/16/2010 for the course GRADUATE I Power IC taught by Professor Chern-linchen during the Fall '09 term at National Taiwan University.

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03-Bandgap Reference - Reference Chern-Lin Chen ( )...

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