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OTA DESIGN and COMPENSATION

OTA DESIGN and COMPENSATION. Two stage CMOS Feedback and Compensation. Basic Two Stage OTA/OPAMP. Avol = Av1 * Av2 GBP = gm1/CL Lower input Noise than Folded Cascode Compensation- Miller and Pole-Zero cancellation Open Loop gain comparable to Folded Cascoded

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OTA DESIGN and COMPENSATION

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  1. OTA DESIGN and COMPENSATION Two stage CMOS Feedback and Compensation

  2. Basic Two Stage OTA/OPAMP • Avol = Av1 * Av2 • GBP = gm1/CL • Lower input Noise than Folded Cascode • Compensation- Miller and Pole-Zero cancellation • Open Loop gain comparable to Folded Cascoded • Wider Output Swing than Folded Cascode • Lower GBP than Folded Cascode

  3. General Observations regarding OpAmps

  4. Two Stage with Optional Buffer

  5. Two Stage with Optional Buffer

  6. Two Stage Frequency ac Response

  7. Pole-Zero and Miller compensation

  8. Slew Rate and Full Power Bandwidth

  9. p vs n Diff pair • best SR/ mW • Allows follower and gain stages poles further separation from the GBP • Improved Noise performance due to 1/f behavior of PMOS vs NMOS • In n-well processes n-follower can not be body tied

  10. Feedback and OTA Compensation

  11. Feedback and OTA

  12. OTA Compensation – pole splitting

  13. PHASE MARGIN

  14. REVIEW of 2ND ORDER SYSTEMS

  15. Pole-Zero Cancelation Model

  16. Pole-Zero Cancellation Model-2

  17. Pole-Zero Cancellation Model-2

  18. Pole-Zero Cancellation Design

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