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Last Lecture – MOS Transistor Review (Chap. #3)

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Presentation on theme: "Last Lecture – MOS Transistor Review (Chap. #3)"— Presentation transcript:

1 Last Lecture – MOS Transistor Review (Chap. #3)
1/3/2019 Last Lecture – MOS Transistor Review (Chap. #3) Transistor Operation Regions & Large Signal Behavior saturation Vgs>Vth & Vds>Vds(sat) ohmic Vgs>Vth & Vds<Vds(sat) subthreshold Vgs<Vth & Vds> 0.2V Small Signal Model low-frequency model Analog Circuit Design

2 Regions of Operation Saturation – Ohmic – Subthreshold –
1/3/2019 Regions of Operation Saturation – Ohmic – Subthreshold – * For p-channel MOSFET, use n-channel equations with p-channel parameters and invert the current Analog Circuit Design

3 Large Signal MOSFET Model
1/3/2019 Large Signal MOSFET Model where: VDS(sat) = Vov = µo = zero field mobility (cm2/V·s) Cox=gate oxide capacitance per unit area (F/cm2) λ = channel-length modulation parameter (V-1) Vt = Vt0 = zero bias threshold voltage γ = bulk threshold parameter (1/V0.5) 2|φf |= strong inversion surface potential (V) ID0 = process dependant parameter (A) n = subthreshold slope factor Analog Circuit Design

4 MOSFET Small-Signal Model
1/3/2019 MOSFET Small-Signal Model Complete Schematic Model Simplified Schematic Model Analog Circuit Design

5 Small-Signal Frequency Dependent Model
1/3/2019 Small-Signal Frequency Dependent Model Complete Model * The capacitor size varies with the region of operation and the transistor size * The parasitic capacitors are constant for a specific region of operation Analog Circuit Design

6 1/3/2019 Frequency Response Analog Circuit Design

7 Single Stage Amplifiers
1/3/2019 Single Stage Amplifiers Analog Circuit Design

8 Common Source Amplifier
1/3/2019 Common Source Amplifier Analog Circuit Design

9 Common Source Amplifier with Degeneration
1/3/2019 Common Source Amplifier with Degeneration Analog Circuit Design

10 1/3/2019 Common Gate Amplifier Analog Circuit Design

11 Common Drain Amplifier or Voltage Follower
1/3/2019 Common Drain Amplifier or Voltage Follower Analog Circuit Design

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