Analog Electronics : Best Starter to Electronics

Explore intrinsic semiconductors, their bandgap, and how conduction and valence bands, valence electrons, and intrinsic concentration govern silicon and other semiconductor materials.

Explore intrinsic carrier concentration for silicon at 300 K by applying the formula Ic = B T^{3/2} e^{-Eg/(2kT)} with material constants, and compare GaAs and Ge results.

Explore extrinsic semiconductors by examining donor and acceptor impurities doping silicon to create free electrons or holes, governed by intrinsic carrier concentration.

Explore extrinsic semiconductors by calculating thermal equilibrium electron and hole concentrations in silicon at 300 K using donor and acceptor dopants and the intrinsic concentration n_i.

Explore how drift and diffusion drive current in semiconductors, via electric field and concentration gradients. Learn drift current density formulas for electrons and holes and how doping tunes conductivity.

Solve drift current density problems for silicon and gallium arsenide by computing carrier concentrations, mobility, and conductivity, then derive resistivity and the required electric field for a target current.

Explore diffusion current density by examining how electrons and holes migrate from high to low concentration, deriving diffusion currents from concentration gradients and diffusion coefficients.

Calculate diffusion current density for silicon electrons and holes using linear concentration gradients and diffusion coefficients at room temperature, and relate diffusion, drift, and total current density via Einstein relation.

Explore how excess carriers arise when photons create electron-hole pairs in non-equilibrium conditions. Relate delta n and delta p to equilibrium n0 and p0 and note recombination in steady state.

Solve examples on intrinsic carrier concentration in silicon, germanium, and gallium arsenide; compute conductivity, resistivity, and drift current density in doped silicon with acceptor and donor impurities.

Study the pn junction of p-type and n-type materials, forming a depletion region and a built-in potential barrier; analyze diffusion, drift, and thermal voltage vt.

Calculate the built-in barrier potential of a PM junction using Vt ln(Na Nd / ni^2) at room temperature, with silicon and gallium arsenide examples yielding 0.757 V and 1.218 V.

Explore how reverse bias on a p-n junction strengthens the depletion region, increases the space-charge width, and modulates junction capacitance Cj, with a worked example.

Examine forward bias in a p-n junction: applying positive voltage to the p side lowers the barrier, enables electron and hole diffusion, and drives current below the built-in potential.

Explain the pn junction i–v relationship Id = Is [exp(Vd/(n Vt)) − 1], define Is, Vt ≈ 0.026 at room temp, and emission coefficient factor lies between 1 and 2.

Explore the pn junction diode, its exponential forward i–v behavior, small reverse current, circuit symbol, and how temperature and thermal voltage shape I_D via I_S (e^{V_D/(nV_T)} − 1).

Present examples to prepare for diode analysis, calculating Vbi with vt and ln(NA*ND/ni^2) and using Id = Is e^(Vd/(n Vt)) for forward and reverse bias.

Explore diode analysis by contrasting ideal and real IV relationships. Distinguish forward and reverse bias and use open and short circuit models to illustrate rectifier behavior and non-linear circuit analysis.

Explore iteration and graphical analysis for a dc diode circuit, applying the diode equation with I_s and V_t to solve for V_d and I_d and identify the q point.

Explore the piecewise linear model to analyze diode circuits by replacing nonlinear behavior with linear approximations, using V gamma and RF, and determine diode current, voltage, and power.

Compare the ideal diode equation with iteration and a specified reverse saturation current to the piecewise linear model using a turn-on voltage and forward resistance.

Solve a piecewise linear diode model example to determine diode current and power dissipation for two supply voltages, using the on-diode equivalent circuit and V gamma 0.7 V.

Use iteration with the diode equation to analyze a two-diode circuit; identical diodes give vd ≈0.598 V, while differing reverse saturation currents yield vd1 ≈0.617 V and vd2 ≈0.557 V.

This lecture presents a piecewise linear diode analysis example, using an on-state diode model with a 0.7-volt turn-on and a simple equivalent circuit to compute diode current and voltage.

Explore how ac diode analysis extends dc diode analysis using superposition to separate dc and ac components, and apply diffusion resistance and diffusion conductance to model the diode's small-signal behavior.

Solve an ac diode analysis example using a two-part dc-ac approach, a piecewise linear model, and diffusion resistance to determine id and vout for a five-kiloohm circuit.

Perform a two-step hd diode analysis using dc analysis and ac analysis, replacing the on diode with a resistor and capacitor, then compute the ac output via diffusion resistance dx.

Understand diffusion capacitance in diodes, driven by voltage changes from an ac signal and forward bias, with the key relation C_DX = dQ/dVd for the change in stored minority carriers.

Explore the forward biased junction's small signal equivalent circuit, including r_d, g_d, diffusion capacitance C_d, and the parallel C_j with a series resistor r_sx for accuracy.

Solar cells convert light into electrical energy with a pn junction, creating photocurrent in the space charge region and a load voltage without an external power supply.

Learn how photodiodes function as photodetectors that convert optical signals into electrical signals, similar to solar cells, producing photocurrent when photons move electrons and holes in the space charge region.

This lecture explains light emitting diodes as forward-biased pn junctions that emit light through recombination, and discusses direct and indirect bandgap materials and material choices.

Explore Schottky diodes formed from metal and n-type semiconductors, highlighting how majority carriers flow enables faster switching, lower turn on voltage, and higher reverse saturation current than PN junction diodes.

Compare Schottky and pn junction diodes by determining forward bias voltages to produce 1 million pairs; reveal Schottky requires less voltage while both share the same current–voltage relation.

Analyze Schottky and pn-junction diodes at a forward current of 1.2 mA, determine their voltages from the given 0.265 V difference, and compute the Schottky reverse saturation current.

Learn how zener diodes use reverse-bias breakdown voltage, understand how limiting current prevents heating, and compare zener diodes with schottky diodes.

Solve a Zener diode current-limiting problem in a simple constant-voltage reference circuit. Use KVL to size the series resistor to 1.47 kΩ, limiting Zener current to 3 mA.

Analyze a Zener diode circuit to determine the external resistance needed to limit its power dissipation, using the Zener voltage and loop equation.

Explore diode circuits and rectifiers, learn how ac is converted to dc for dc power supplies, and compare half-wave and full-wave rectification.

Analyze a half-wave rectifier circuit using a diode and transformer, applying a piecewise linear model to understand forward and reverse bias, turn-on voltage, and the resulting rectified output.

Learn to simulate a half-wave rectifier in mutism, using an ac voltage source, diode, and resistor, with ground and oscilloscope probes to compare input and output.

Explore the half-wave rectifier in a battery-charging circuit, determining peak diode current, maximum reverse voltage, and the conduction interval from the input sine wave.

Analyze a half-wave rectifier with a 12 v peak input, 4.5 v bias, and 0.6 v drop across 250 ohms, and compute 25.15° to 154.85° conduction window and 36% duty.

Learn how a center-tapped transformer and two diodes create a full-wave rectifier, converting both halves of an AC signal into pulsating DC, with turns ratio considerations.

Simulate a full-wave rectifier using two AC sources and two diodes, with a resistor and ground to observe the rectified output. Try a bridge rectifier simulation as another full-wave option.

Compare center-tapped and bridge full-wave rectifiers by turns and rms and peak values, concluding the bridge is more advantageous due to fewer turns and lower peak inverse voltage.