Voltage(reference(and(bandgap(circuits( - MiXeDsIgNaL...

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    22-Apr-2020
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Transcript of Voltage(reference(and(bandgap(circuits( - MiXeDsIgNaL...

  • Voltage  reference  and  bandgap  circuits  

  • Basic  blocks  for  voltage  reference  circuits  

  • Characteris8cs  of  bipolar  transistors  

  • Temperature  dependence  of  BJT  characteris8cs  

  • Temperature  dependence  of  ΔVBE  

  • Temperature-­‐compensa8on  of  VBE  voltage  

  • Temperature-­‐constant  Reference  Voltage:   “Bandgap-­‐Reference”  

  • Opera8on  of  Bandgap-­‐Reference  Circuit  

  • Bandgap-­‐Reference  Circuit  

  • Gummel  plot  of  BJT  

  • Startup-­‐Problem  of  Bandgap-­‐Reference  Circuit  

  • Adjustment  of  bandgap  reference  voltage  

  • Undervoltage  detec8on  circuit  based  on  the   bandgap  reference  principle  

  • Undervoltage  detec8on  circuit  

  • CMOS  Compa8ble  Bandgap  Reference  

  • Bandgap  reference  with  all  npn-­‐collectors   connected  to  VDD  

  • Bandgap  reference  in  a  n-­‐well  CMOS  technology  

  • „Widlar“  Bandgap  –  Reference  

  • Current  -­‐  Reference  based  on  ΔVBE  

  • Cross-­‐coupled  current  source  based  on  ΔVBE  

  • Adjustable  Z-­‐diode  

  • Z-­‐diode  voltage  mul8plier