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HKN ECE 342 Review Session 1

HKN ECE 342 Review Session 1. Anthony Li Alec Wasowicz. MOSFET’s. NMOS. PMOS. MOSFET Operating Point. Three regions of operation: Cutoff (V GS < V T ): I D = 0 Linear/Triode (V GS > V T , V DS < V GS - V T ): Saturation (V GS > V T , V DS > V GS - V T ): Note:.

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HKN ECE 342 Review Session 1

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  1. HKN ECE 342 Review Session 1 Anthony Li Alec Wasowicz

  2. MOSFET’s • NMOS • PMOS

  3. MOSFET Operating Point • Three regions of operation: • Cutoff (VGS < VT): ID = 0 • Linear/Triode (VGS > VT, VDS < VGS - VT): • Saturation (VGS > VT, VDS > VGS - VT): • Note:

  4. MOSFET Incremental Model Transconductance:

  5. Gain Calculation Av = -GMRout GM = Short Circuit small signal transconductance, ratio of iout to vin ROUT = Equivalent incremental output resistance

  6. Common Amplifier Topologies • Diode-tied Transistor • What is overdrive voltage here? • Is this always in saturation? • Common Source/Drain/Gate • Purpose of each topology? • equations • Common Source with Degeneration • Cascode Diode Tied Transistor

  7. Common Source/Drain/Gate ROUT = RD || rds Gm = gm ROUT = RS || (rds || 1/gm) Gm = - gm ROUT = RD || rds Gm = - gm

  8. Degeneration When a resistance is “viewed” through the drain, it appears bigger by a factor related to the transconductance.

  9. Cascode • Similar to degeneration but GM is not attenuated

  10. Fall 2016 Midterm 2 Problem 1

  11. Fall 2017 Midterm 2 Problem 3

  12. Fall 2017 Midterm 2 Problem 3

  13. Homework 5 Problem 3 Part I Find AV

  14. Homework 6 Problem 2 Part F

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