# Courses

## EE 105. Microelectronic Devices and Circuits

### Description

Course objectives: This course introduces the basic theory of semiconductor devices and circuits, and the basic circuit analysis skills for large-signal, small-signal, and ac frequency response. Its intention is to promote rigorous thinking about semiconductor devices and circuits through precise modeling.

Topics Covered:

• Introduction; Semiconductors ¿ Microelectronics; Moore's Law; Semiconductor basics: Intrinsic silicon, electrons, holes, charge neutrality; Doping: Donors, acceptors, compensation.
• Charge transport and the IC resistor ¿ Transport: Drift, drift current density, Ohm's law, velocity saturation; IC resistor: Lateral drift current.
• IC Fabrication ¿ IC resistor: Non-linear resistor; IC resistor: Capacitance (interconnect); Approximate passive models: Extraction; Diffusion currents.
• Electrostatics Review ¿ 1-D Gauss's law and boundary conditions; Metal-metal capacitor layout; Charge, fields, and capacitance.
• pn Junctions: Thermal equilibrium ¿ Depletion approximation; Potential vs. doping: The built-in potential; Charge, field, potential for pn junction.
• pn Junctions: Reverse bias, Forward bias, and Capacitance ¿ Charge, field, potential in reverse bias: qJ = f(vD); pn Junction capacitance: Cj = dqJ / dvD; pn Diode in forward bias: A first pass and the i-v relationship.
• MOS Capacitors ¿ Surface charge in thermal equilibrium; Depletion, accumulation, and inversion; qG = f(vGS) and Cg = dqG / dvGS .
• MOSFETs: Large-signal Model ¿ Symbols and drain characteristics; Triode and saturation regions; Backgate effect.
• MOSFET Sample & Hold Circuit ¿ Graphical analysis; Analytical solution; SPICE.
• Common Source Amplifier (Resistive Load) ¿ Large-signal transfer curve; Small-signal operation: Motivate small-signal model.
• MOSFET Small-Signal Model ¿ Transconductance, including backgate output resistance, capacitances.
• Small-Signal Analysis ¿ Body effect; PMOS model.
• MOSFET Current Sources (and Sinks) ¿ Diode-connected MOSFET as voltage source; Current mirror concept; Audio Digital-to-Analog Converter Example.
• Two-Port Models ¿ Four amplifier types: Voltage, current, trans-G, trans-R tests to find amplifier parameters.
• Common-Drain Amplifier ¿ Voltage gain, input and output resistances.
• Common-Gate Amplifier ¿ Current gain, input and output resistances.
• Frequency Response, MOSFET ac Models ¿ Transfer functions; Poles and zeroes; Bode plot techniques.
• Frequency Response ¿ Phasor analysis for sinusoidal steady-state signals; Bode plots.
• Frequency Analysis, Second-Order Circuits
• Second-Order Circuits, Amplifier Response ¿ Unity gain frequency, gain-bandwidth product.
• Frequency-Domain Analysis Insight & Approximations ¿ Feedforward zero Miller approximation; Method of time constants.
• Common Gate, Common Drain Frequency Response, Multi-Stage Amplifiers ¿ Boostrapping of gate-source capacitance; Multi-stage amplifiers.
• Multistage Amplifiers: The cascode ¿ Two-port models; Current and voltage bias design; ac Analysis.
• Forward-Biased pn Junction, Bipolar Junction Transistor ¿ Modes of operation of a BJT.
• Bipolar Junction Transistor ¿ Principle of operation.
• Bipolar Junction Transistor ¿ Transistor action; Ebers-Moll model; Large-signal model.
• Bipolar Junction Transistor (cont.) ¿ Small-signal model; CE, CB, CC amplifiers; BJT versus MOSFET; Emitter degeneration.
• Frequency Dependence of Input and Output Impedances ¿ Frequency response of CC amplifier; figures of merit (gm/IC, fT).

General Catalog