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MOSFET in the ‘Triode’ region (revisiting)

MOSFET in the ‘Triode’ region (revisiting). MOSFET in the ‘Triode’ region. FYI, if you want to make precise evaluations, it is necessary to use a more complete formula than the simplistic model: Still an approximation …. MOSFET in the ‘Triode’ region. Series expansion around 0 for Vs and Vd:.

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MOSFET in the ‘Triode’ region (revisiting)

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  1. MOSFET in the ‘Triode’ region(revisiting) ESINSA

  2. MOSFET in the ‘Triode’ region FYI, if you want to make precise evaluations, it is necessary to use a more complete formula than the simplistic model: Still an approximation …. ESINSA

  3. MOSFET in the ‘Triode’ region Series expansion around 0 for Vs and Vd: ESINSA

  4. MOSFET in the ‘Triode’ region small ESINSA

  5. Transconductor - C ESINSA

  6. Vin Vout gm C Transconductor - C The integrator based on a transconductance: Iout ESINSA

  7. Transconductor? Iout R Vin ESINSA

  8. Iq-Iout Iq+Iout Vin -Vin 2xIq Linear transconductance? ESINSA

  9. I1 I2 V1 V2 Vc Vc I1+I2 Linear transconductance ESINSA

  10. Iq1+Iq2+Iout Iq1+Iq2-Iout V1 V2 2xIq1 2xIq2 > 2xIq1 Linear transconductance ESINSA

  11. Iq-Iout Iq+Iout -Vin Vin Iq Iq Linear transconductance ESINSA

  12. Iq-Iout Iq+Iout Vb -Vin/2 Vin/2 Iq Iq Linear transconductance Degenerating the sources ESINSA

  13. Vb1 -Vin/2 Vin/2 Vb2 Linear transconductance ESINSA

  14. CMFB -Vout/2 Vout/2 C Iout Iq-Iout Iq+Iout Vb M2 M1 -Vin/2 Vin/2 M3 Iout Iq Iq Transconductor - C ESINSA

  15. S Transconductor - C CMFB -Vout/2 Vout/2 C Iout Common Mode Feedback Transconductance Tuning Vb M2 M1 -Vin/2 Vin/2 M3 Iout Iq Iq ESINSA

  16. Resistor R -gm ESINSA

  17. Balanced Resistor gm R ESINSA

  18. Variant Using Gyrators ESINSA

  19. Gyrator i1 i2 r V1 V2 ESINSA

  20. Inductance? i1 i2 r C V2 V1 Inductance! ESINSA

  21. r gyrator Practical Realization of a Gyrator gm V1 V2 -gm ESINSA

  22. gm gm r gyrator Balanced Gyrator V1 V2 Minus Sign is here ! ESINSA

  23. r r r L/r 2 Capacitance !!! L/r 2 A few applications of the Gyrator L L ESINSA

  24. r r L C A few applications of the Gyrator L/r 2 C Etc.. ESINSA

  25. C2 L2 R C3 R C1 An Example: RLC Filter ESINSA

  26. C2 R L2 C3 R C1 C2 r r R Vin C3 C1 L2/r 2 R C2 r r Vin/R C1 C3 L2/r 2 R R Example mapping ESINSA

  27. C2 R L2 C3 R C1 Example C2 (mapping) gm gm gm L2/r2 C3 C1 -gm -gm -gm -gm ESINSA

  28. C2 R L2 C3 R C1 Example Balanced version: 2C2 r r Vin/R L2/r 2 ESINSA

  29. C2 R L2 C3 R C1 Example Balanced version: 2C2 L2/r 2 gm 2gm gm 2gm gm gm 2gm C3 C1 2C2 ESINSA

  30. -Vout/2 Vout/2 C Tuning M1 -Vin/2 Vin/2 Tuning the Transconductor - C ESINSA

  31. Transconductor - C Same care has to be taken as for other continuous time filters. Distortion and dynamic range are the major concerns. For high speed modules, bandwidth of the transconductor will interfere with the transfer function. Reserve Transconductor-C, like MOSFET-C, to high speed filters. Do not expect great precision. It is not yet clear which one will supersede the other, or if they will coexist. ESINSA

  32. Conclusion: Integrated Filters Very hot topics. DSP is taking a huge share in the filters. More and more. Still, analog to digital and digital to analog converters are processing samples. Analog filtering cannot be avoided. Performances demand is increasing every year. There is no reason that this trend will change in the future. ESINSA

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