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Fundamentals of Circuits: KVL/KCL and MOSFET Operating Points Review

Learn about Kirchhoff's Voltage Law/Current Law, incremental modeling from Taylor Series, and MOSFET operating regions and equations.

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Fundamentals of Circuits: KVL/KCL and MOSFET Operating Points Review

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

  2. KVL/KCL • Sum of all voltages in a loop is 0 • Sum of current entering a node equals sum of current exiting a node

  3. Incremental/Small Signal Model • Can be numerically derived from Taylor Series approximation (up to first-order term) • Taylor Series: y = f(x0) + f’(x0)(x - x0) + f’’(x0)(x-x0)2/2 + ...

  4. MOSFET’s

  5. MOSFET Operating Point • Three regions of operation: • Cutoff (VG < VT): ID = 0 • Linear/Triode (VG > VT, VDS < VGS - VT): ID = μn/pCox(W/L)((VGS - VT)VDS - VDS2/2) • Saturation (VG > VT, VDS > VGS - VT), ID = μn/pCox(W/L)(½)(VGS - VT)2

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