Complete Review of MOS Transistor Operation and Models in Analog Circuit Design
Explore the operation regions of MOS transistors, including saturation, ohmic, and subthreshold regions. Learn about the small-signal and large-signal behavior, as well as frequency-dependent models in analog circuit design. Dive into practical examples and understand various amplifier configurations for effective circuit design.
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Presentation Transcript
INEL 5265 Review I 3/18/2025 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 1 Analog Circuit Design
INEL 5265 Review I 3/18/2025 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 2
INEL 5265 Review I 3/18/2025 Large Signal MOSFET Model where: VDS(sat) = Vov = o = zero field mobility (cm2/V s) Cox=gate oxide capacitance per unit area (F/cm2) = channel-length modulation parameter (V-1) Vt = Vt0 = zero bias threshold voltage = bulk threshold parameter (1/V0.5) 2| f |= strong inversion surface potential (V) ID0 = process dependant parameter (A) n = subthreshold slope factor Analog Circuit Design 3
INEL 5265 Review I 3/18/2025 MOSFET Small-Signal Model Complete Schematic Model Simplified Schematic Model Analog Circuit Design 4
INEL 5265 Review I 3/18/2025 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 5
INEL 5265 Review I 3/18/2025 Frequency Response 6 Analog Circuit Design
INEL 5265 Review I 3/18/2025 Single Stage Amplifiers 7 Analog Circuit Design
INEL 5265 Review I 3/18/2025 Common Source Amplifier = A g R 0r v m D 8 Analog Circuit Design
INEL 5265 Review I 3/18/2025 Common Source Amplifier with Degeneration = A G R r 0 v m g D m = G m + 1 g R m s 9 Analog Circuit Design
INEL 5265 Review I 3/18/2025 Common Gate Amplifier v= A g R 0r m D 10 Analog Circuit Design
INEL 5265 Review I 3/18/2025 Common Drain Amplifier or Voltage Follower 1 = A g Ro v m g m 11 Analog Circuit Design
