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Differential Amplifiers

Differential Amplifiers. Prof. Paul Hasler. Differential Transistor Pairs. MOSFET Diff-Pair. BJT Diff-Pair. Differential Transistor Pairs. MOSFET Diff-Pair. BJT Diff-Pair. The bottom transistor (the one with I bias ) sets the total current. Differential Transistor Pairs. MOSFET Diff-Pair.

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Differential Amplifiers

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  1. Differential Amplifiers Prof. Paul Hasler

  2. Differential Transistor Pairs MOSFET Diff-Pair BJT Diff-Pair

  3. Differential Transistor Pairs MOSFET Diff-Pair BJT Diff-Pair The bottom transistor (the one with Ibias) sets the total current

  4. Differential Transistor Pairs MOSFET Diff-Pair BJT Diff-Pair The bottom transistor (the one with Ibias) sets the total current The upper two transistors compete for a fraction of this current

  5. Analysis of Diff-Pair

  6. Analysis of Diff-Pair

  7. Analysis of Diff-Pair

  8. Analysis of Diff-Pair

  9. Analysis of Diff-Pair

  10. Analysis of Diff-Pair Source of Common-Mode Gain

  11. Analysis of Diff-Pair

  12. Analysis of Diff-Pair

  13. Differential Pair Currents 3 Iout- Iout+ 2.5 2 (nA) 1.5 Output current 1 0.5 0 -0. 4 -0. 3 -0. 2 -0. 1 0 0.1 0.2 0.3 0.4 Differential input voltage (V)

  14. Transistor ‘Leg’ Currents

  15. Transistor ‘Leg’ Currents

  16. BJT Differential Pair Analysis + - Iout Iout V1 V2 Vb GND

  17. BJT Differential Amplifier + - Iout Iout V1 V2 Vb GND

  18. Vdd Vdd Iout Vout BJT Differential Amplifier V1 V2 Vb GND

  19. Vdd Vdd Iout Vout BJT Differential Amplifier Fixed output voltage: Current output Zero output current: Voltage output V1 V2 Vb GND

  20. Basic Differential Amplifier

  21. Transfer Functions

  22. Wide-Output Range Differential Amplifier Simple differential amplifer "Vmin" effect

  23. Simple differential amplifer "Vmin" effect Wide-Output Range Differential Amplifier Wide-output range amplifier

  24. Simple differential amplifer "Vmin" effect Wide-Output Range Differential Amplifier Wide-output range amplifier

  25. A Unity-Gain Follower

  26. A Unity-Gain Follower

  27. A Unity-Gain Follower Amp Gain = Av Av Solving: Vout = Vin 1 + Av A more ideal Follower / Buffer Circuit

  28. A Unity-Gain Follower Amp Gain = Av Solving: Vout~ Vin

  29. A Unity-Gain Follower Amp Gain = Av Solving: Vout ~ Vin

  30. Differential Pairs / Amplifiers • Differential Transistor Pairs • Differential Amplifiers • Unity-Gain Amplifiers

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