Electronic Circuits - Part2: Diode Circuits

Review lumped-circuit analysis with Kirchhoff's laws and independent and dependent sources. Summarize resistors, capacitors, inductors; their series and parallel behavior and DC/AC reactances.

Apply KVL and KCL to loops and nodes using the passive sign convention and a reference ground to relate voltages, drops, and rises in circuits.

Apply the mesh-current method with KVL to find mesh currents I1, I2, I3, form AX=B, and solve with MATLAB or MultiSim, including dependent sources such as Ix = -I3.

Learn to handle current sources in mesh-current analysis by transforming parallel current sources with resistors to voltage sources, applying KVL with super-mesh, and using KCL to relate mesh currents.

Explore node-voltage analysis using Kirchhoff's current law to determine unknown node voltages from a reference node, forming KCL equations, handling super-nodes and source transformations through practical examples.

Explore Thevenin and Norton equivalent circuits by deriving open-circuit voltage and short-circuit current, transforming sources, and simplifying resistance for linear networks.

Explore the i-v characteristics of a pn junction diode, including forward bias, knee voltage, reverse saturation current, and zener or avalanche breakdown, with a MATLAB plot.

Compare silicon and germanium diode iv curves, noting germanium's lower forward voltage and low junction capacitance, and show how temperature affects reverse saturation current and vt.

Analyze diode characteristics and temperature effects, including the 10°C doubling of reverse saturation current and a -2 mV/°C voltage change at constant current.

Explore diode dc resistance and load-line analysis to determine the quiescent point using Thevenin equivalents and Kirchhoff's voltage law, with graphical and numerical methods.

Explore diode approximate models, from the ideal diode to piecewise linear and constant voltage drop models, and solve circuits using linear replacements, forward resistance, and KVL.

Explore advanced piecewise linear diode modeling, using multiple linear segments to approximate the exponential curve, with forward conductance, varying slopes, and parallel branches to capture forward and reverse behavior.

Solve diode circuits by guessing diode states, applying the ideal model, shorting and opening paths, and verifying currents and voltages to determine which diodes conduct.

Explore transfer characteristics of a diode circuit with ideal diodes, using KVL to determine conduction states and boundary voltages. Design diode-resistor networks to shape the input-output curve.

Explore the diode's small-signal model under dc bias, deriving dynamic resistance from the q-point and performing ac analysis with linear approximations, including depletion-layer capacitance Cj and diffusion capacitance Cd.

Determine the maximum input for small-signal operation by dc analysis to 1 mA, calculating the diode's dynamic resistance, and applying a Thevenin equivalent to yield a 0.62 V peak limit.

Examine Zener diodes, their reverse breakdown operation, and simple models as a voltage source with Zener resistance. Analyze voltage, current, power, and temperature coefficients in circuits.

Keep the Zener diode in breakdown by choosing load resistance between 160 ohms and 1 kΩ and maintaining the input voltage between 8.4 and 13.8 volts.

Learn how light emitting diodes emit light from forward-biased PN junctions, control light output with forward current, and use current-limiting resistors for seven-segment displays and BCD decoders.

Photodiodes operate in reverse bias and are designed to be sensitive to light, producing a reverse current that increases with light intensity, enabling variable resistance behavior and fast light-driven switching.

Explore a 36-cell solar module in series to determine delivered voltage, current, and short circuit current. Then learn about opto-isolators using LEDs and photodiodes to transfer signals between isolated circuits.

Explore varactor diodes, voltage-dependent capacitors whose depletion region alters capacitance; apply in LC tuned circuits, VCOs, adjustable filters, and frequency control devices with voltage control.

Schottky diodes form a metal-semiconductor junction with a low forward voltage drop and very fast switching, since there is no minority-carrier storage and storage time is zero.

Explore tunnel diodes, their negative resistance in VI characteristics created by tunneling through a thin depletion region, and how biasing with a load line enables oscillator circuits and undamped resonances.

Discover how to build and simulate analog circuit designs in Multisim by placing components, wiring them, and using the interface with toolbars and menus for rapid simulations.

Connect components in Multisim, assign voltages and resistances, place ground, and run a DC operating point simulation to observe currents, voltages, and mesh currents.

Learn to simulate circuits with dependent sources in Multisim. Configure VCVS and CCVS, set up global connectors, and verify mesh currents against algebraic solutions.

Find Thevenin resistance from terminals A and B using open-circuit voltage and short-circuit current in Multisim, then verify with circuits containing independent and dependent sources.

Plot a diode's IV characteristics in Multisim using DC sweep with adjustable start, stop, and increment. Observe how temperature sweep affects diode voltage and current.

Use Multisim to simulate a four-diode, four-resistor circuit and verify current I around 0.5 mA. Show how adjusting diode parameters and using ideal diodes aligns results and reveals on/off states.

Learn to perform dc and ac analysis of diode circuits in Multisim and run transient analysis to observe the diode's ac voltage at 50 Hz.

Demonstrate plotting output Vout versus Vin for diode circuits in Multisim using dc sweep from 0 to 100 volts, with ideal diodes, and export iv/vi data to excel and matlab.

Review the properties of alternating current and voltages, including sinusoidal and non-sinusoidal waveforms, symmetry, cycle, period, frequency, phase, and peak, rms, and average values. Prepare for diode rectifier circuit applications.

Review ideal transformer basics essential for diode rectifier analysis, including turns ratio, step-up and step-down behavior, isolation, and center-tapped configurations for rectification.

Explore the half-wave rectifier, using an ideal transformer and diode to convert ac to pulsating dc, analyze output voltage, ripple, efficiency, and regulation with peak inverse voltage considerations.

Demonstrate half-wave rectification using a piecewise linear diode model to compare non-ideal and ideal outputs, and analyze transformer-based rectification with peak, dc, rms values, ripple factor, and regulation.

Center tapped rectifier uses two diodes and a center-tapped secondary to deliver pulsating dc, with diodes conducting on alternate half cycles and requiring analysis of efficiency, ripple, and PIV.

Explore the bridge rectifier as a four-diode full-wave converter, isolating input from output, and assess its efficiency, ripple, peak inverse voltage, and capacitive filters to reduce ripple.

Explore how a capacitor across the load smooths ripple in rectifiers by charging to the peak and discharging through the load via the diode, governed by RC time constants.

Design capacitive filter rectifier circuits to meet specified dc outputs and ripple targets, applying transformer turns ratio, diode parameters, and KVL for half-wave and center-tapped full-wave configurations.

Explore am modulation and demodulation with simple diode-based circuits, including a chopper modulator and peak detector, to transmit and recover carrier and message signals.

Explore am modulation and demodulation using Multisim, featuring a 1 kHz message modulated onto a 100 kHz carrier, with an ideal diode peak detector and a band-pass filter design.

Learn to design Zener diode voltage regulators, analyze dc and ac behavior, and ensure Zener current stays within safe limits using worst-case load and supply variations.

Analyze zener regulator examples to determine input ranges that keep the zener in breakdown and design the regulator to maintain 9.05–9.1 V output as input varies 12–20 V.

Design a regulated dc power supply using rectifiers, capacitive filters, and zener stabilization to control ripple and zener current. Explore Thevenin resistance, load variations, transformer turns, and Multisim simulations.

Explains voltage multipliers using capacitors and diodes, with half-wave and full-wave doublers that boost peak rectified voltage to 2Vm for applications like air purification.

Explore how clamper circuits shift a signal by a reference DC level using diodes and capacitors, creating one-way or two-way clamps while preserving waveform shape in steady state.

Explore negative clamper and clamping circuits in diode networks, analyzing how a large capacitor and a large time constant shape the steady-state output waveforms and clamped levels despite non-ideal diodes.

Learn how clipping circuits remove portions of a waveform using single-ended and double-ended configurations, including shunt and series clippers with bias and Zener options, guided by transfer characteristics.

Explore double-ended clipping circuits that produce two independent clipping levels using diodes or Zener diodes, forming slicer transfer characteristics and potential symmetrical square-wave outputs.

Explore practical diode applications, including using diodes to shift signal levels, protect circuits with flyback and reverse-bias protection, and implement simple logic gates and comparators.

Set up your electronics workspace, organize components with compartment storage and data sheets, and build and test diode circuits using a multimeter and myDAQ.

Learn to use myDAQ as a multimeter, signal generator, and oscilloscope. Compare analog and digital meters, and master measuring voltage, current, resistance, and continuity with safe, auto-ranging practice.

Explore breadboards or protoboards for solderless circuit prototyping, learn row and column layout, central gap for ICs, power rails, and essential tools for wiring and component handling.

Discover resistor fundamentals, including through-hole and surface-mount types, 4-band and 5-band color codes, tolerance, and how to measure resistance with multimeters and myDAQ.

Generate voltages from a single source with voltage dividers and Thevenin equivalents to create 5 V and 2 V rails, and simulate with NI myDAQ and Multisim.

Design and analyze a voltage divider using 50k and 10k potentiometers to obtain 2 V from a 7 V source, and verify with NI myDAQ and Multisim.

Learn to read and measure capacitance, identify ceramic, electrolytic, and film capacitors, and use methods like multimeter, oscilloscope, and Bode plots to determine capacitance and cutoff frequency.

Explore inductors and their inductance, including fixed and variable types: air-core, iron-core, ferrite-core, and toroidal, plus surface-mount usage, color codes, high-frequency applications, and LCR meter measurement.

Explore how data-sheets from chip suppliers guide circuit design, revealing parameters like forward current, peak inverse voltage, junction capacitance, temperature, size, and circuit board dimensions for diodes, transistors, and ICs.

Explore the different diode types, learn two multimeter tests, and examine dc and ac behavior under forward and reverse bias, including leds and zener diodes.

Design two led-based indicators: a fuse burn indicator and a diode polarity detector, using diodes and a single resistor to show fuse status and correct battery polarity.

Build a diode regulated power supply on a breadboard using a 9V transformer, full-wave bridge, capacitive filter, and a 6.2V zener to limit ripple.

Explore two practical diode circuits: a 230 v ac negative ion generator with a voltage multiplier, and a led string powered by a transformerless resistive or capacitive supply.

Demonstrate the practical use of a Shottky diode in a TTL logic circuit with an AND gate, showing how it discharges a capacitor when power is removed.

Conclude part two of electronic circuits by reinforcing understanding of PN junction diodes and inviting learners to access references and connect via YouTube, LinkedIn, and Twitter.