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In the name of God

In the name of God . Special Topics on Electronics . Mohsen Tamaddon Ghiasodin Jamshid Kashani Institute of Higher Education . Tamaddon.mohsen@gmail.com. Winter 1391. With taking advantages of IC Lecture notes, Prof B. Razavi ( University of California at Los-Angles)

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In the name of God

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  1. In the name of God Special Topics on Electronics Mohsen Tamaddon GhiasodinJamshidKashani Institute of Higher Education Tamaddon.mohsen@gmail.com Winter 1391

  2. With taking advantages of IC Lecture notes, Prof B. Razavi ( University of California at Los-Angles) IC Lecture notes, Dr. M. Yavari ( Amirkabir University of Technology)

  3. Current-Mirrors and Single-Stage Amplifiers Main Reference Razavi’s CMOS Text Book – Ch-3 & 5 Extra reading text: Johns & Martin – Analog Book

  4. Source follower and Common Drain SS-MF ? Bias Active Load V-Bias

  5. Common Drain Amplifier d g s T - Model Lemma

  6. Common-Gate Amplifier Active Load Bias

  7. Common-Gate Amplifier SS-MF

  8. High Output Impedance Current Mirrors ?

  9. High Output Impedance Current Mirrors SS-MF

  10. How do we generate Vb We must guarantee  This result suggests that if a VGS voltage is added to VX , the required value of the Vb can be obtained. Another Diode-Connected is needed ! ( How to add it ?! ) With a proper choice of the M0 and M3 the target cab be achieved Vb = VN Target

  11. Cascode Current Mirror

  12. Swing Analysis in detail Lower Swing !! Why ?

  13. Comparison of 2 structures The answer to the later why  because we force VDS2 to be equal to VGS2 In any circuit, where due to of some reasons we force VDS to be equal to VGS we waste the swing by one VTH Swing & Accuracy Trade-off ! Vb is chosen such that  Vb is chosen such that  Wider swing but lower accuracy Lower swing but higher accuracy

  14. Large Signal Behavior of Cascode Current Mirror If 

  15. Large Signal Behavior of Cascode Current Mirror M2 goes into the triode region  VA –VB = VTH2 Vx = VDS3 + VB = VDS3 + VA – VTH2 Both in Saturation

  16. Wide-Swing Cascode Current Mirror How to overcome the Swing & Accuracy Trade-off ? A whiteboard discussion should be presented here ! Widely used Current source

  17. Wide-Swing Cascode Current Mirror

  18. Wide-Swing Cascode Current Mirror All the transistors are in saturation VGS Minimum headroom for M3 and M4While  VDS-M1 = VDS-M3

  19. Wide-Swing Cascode Current Mirror A Must  VA = VB

  20. Wide-Swing Cascode Current Mirror

  21. Wide-Swing Cascode Current Mirror Enhanced Swing 

  22. LV Cascode Current Mirror (cont’d) We can shorten X and A in ac !

  23. Biasing of LV Cascode Current Mirror VR 1 Some inaccuracy arises

  24. Biasing of LV Cascode Current Mirror 2 Very low current density

  25. Biasing of LV Cascode Current Mirror 3 The same problems is still exists for (3)

  26. Biasing of LV Cascode Current Mirror

  27. Wilson Current Mirror

  28. Cascode Gain Stage

  29. Telescopic-Cascode Amplifier SS-MF

  30. Cascoding Amplifiers

  31. Biasing of Telescopic-Cascode Amplifier

  32. Folded-Cascode Amplifier

  33. Any Questions ?

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