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SLOVENIA Ljubljana

SLOVENIA Ljubljana. INTRODUCTION. Objective. The objective of this presentation is to show how to set the operating conditions for analogue circuits and how to improve the biasing performances. Outline. Circuit Biasing Current Sources Current Mirrors Current references

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SLOVENIA Ljubljana

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  1. SLOVENIALjubljana

  2. INTRODUCTION Objective The objective of this presentation is to show how to set the operating conditions for analogue circuits and how to improve the biasing performances. Outline • Circuit Biasing • Current Sources • Current Mirrors • Current references • Voltage References • Amplifiers and some other a.b. • Circuit Examples

  3. Basic Current Source and Current Mirror

  4. Using biasing - an example

  5. Using Mirrored Currents - an example: 8 BIT Thermometric DA Converter

  6. Improved 8 BIT Thermometric DAC

  7. Improved mirrored current - High impedance cascode current source Output impedance: Gate voltage on Tco: Sufficient voltage on Vco: Solution on next slide

  8. Low voltage swing cascode mirror Source follower - formed by Ts and Tso:

  9. Regulated mirror transistor (To) -channel voltage Vds Principle Practical realisation

  10. High swing cascode mirror

  11. Low current, Low voltage - self cascode current mirror • serial - stacked Vds devices • parallel devices - summing • serial/parallel - matching due to different current gains Minimal supply voltage: Design considerations:

  12. Source resistors and performances of the current sources

  13. Short channel effect

  14. BiCMOS Current Mirrors

  15. Emiter-resistors neglected: With emiter-resistors ( base currents neglected):

  16. Beta buster Logarithmic dependence of Io from supply voltage:

  17. Cascode Current Mirror Output mirrored current Io (resistors neglected):

  18. BiCMOS Current Mirror - Example

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