This learning course explains about feedback amplifier, oscillator, tuned amplifier, multivibrator circuits, blocking oscillator and time base generator.
Negative and positive feedback- Introduction to feedback, Positive and negative feedback, Advantages and disadvantages, Comparison of positive and negative feedback. Block diagram of negative feedback - General feedback structure. Properties of negative feedback - Gain Desensitivity, Bandwidth Extension, Noise Reduction, Reduction in Nonlinear Distortion. The four basic feedback topologies - Basic feedback topologies, Voltage amplifiers, Current amplifiers, Transconductance amplifiers, Transresistance amplifiers. The Series-Shunt Feedback Amplifier - The ideal situation, The practical situation. The Series-Series feedback amplifier - The ideal case, The practical case. The shunt – shunt feedback amplifier - The ideal case, The practical case. The Shunt - series feedback amplifier - The ideal situation, The practical situation. Determining the loop gain- Determination of loop gain by applying test signal, Determination of loop gain by finding Toc and Tsc, Determination of loop gain by finding loop transmission. The stability problem - Transfer function of the feedback amplifier, Nyquist plot. Effect of feedback on the amplifier poles -Stability and Pole Location, Amplifier with a Single-Pole Response, Amplifier with Two-Pole Response, Amplifiers with Three or More Poles. Stability study using bode plots - Gain and phase margins, Effect of phase margin on closed-loop response. Frequency compensation - Frequency compensation, Implementation of frequency compensation, Miller compensation and pole splitting.
Oscillator -Introduction to Oscillator, Types of oscillators, Basic theory of oscillator, Comparison between amplifier and oscillator. Requisites and Classification of oscillators - Requisites of an oscillators, Classification of oscillators, Applications of oscillators. Barkhausen criterion - Barkhausen criterion. Amplifier as an oscillator - Amplifier as an oscillator. LC Tank circuit - LC Tank circuit, Drawback of a practical tank circuit. Frequency stability of an oscillator - Frequency stability of an oscillator. LC oscillator - Basic form of LC oscillator circuit. Hartley oscillator - Hartley oscillator, Condition for sustained oscillations, Advantages and disadvantages of hartley oscillator. Colpitt’s oscillator - Colpitt’s oscillator, Condition for sustained oscillations, Advantages and disadvantages of colpitt's oscillator. Clapp oscillator - Clapp oscillator. Franklin oscillator - Franklin oscillator. Armstrong oscillator - Armstrong oscillator. Tuned collector oscillator - Tuned collector oscillator. RC phase shift oscillator- RC phase shift oscillator, RC Oscillator, RC phase shift oscillator, RC feedback network, Condition for sustained oscillations, Transistorized RC Phase Shift Oscillator, Phase shift oscillator using Op-amp, FET phase oscillators, Advantages and disadvantages of RC phase shift oscillator. Wein bridge oscillator - Wein bridge oscillator, Advantages and disadvantages of wein bridge oscillator, Problem to determine the frequency of oscillations. Piezo Electric Effect – Piezo electric crystals, Piezo Electric effect, Reasons for instability and its remedies. Twin T oscillator - Twin T oscillator. Crystal oscillator - Crystal oscillator, A.C equivalent circuit of a crystal, Series and Parallel resonance, Crystal Stability. Quartz crystal - Quartz crystal construction, Frequency Stability of Oscillator. Pierce and Miller crystal oscillator - Pierce Crystal Oscillator, Miller Crystal Oscillator.
Coil losses - Introduction of tuned amplifier, Introduction of coil losses. Quality (Q) factor - Introduction of Q Factor, Unloaded and loaded Q, Requirements of tuned amplifier. Small signal tuned amplifier - Classification of tuned amplifier, Small signal tuned amplifier, Example of small signal tuned amplifier. Single tuned capacitor coupled amplifier - Single tuned capacitance coupled amplifier, Example of single tuned amplifier. Double tuned amplifier - Double tuned amplifier, Analysis of Double tuned amplifier. Effect of cascading tuned amplifier on bandwidth – Introduction, Effect of cascading single tuned amplifier on bandwidth, Effect of cascading double tuned amplifier on bandwidth. Stagger tuned amplifier - Stagger tuned amplifier. Large signal tuned amplifier - Large signal tuned amplifier, Class B tuned amplifier Class C tuned amplifier, Application of class C tuned amplifier. Stability of tuned amplifier - Stability of tuned amplifiers. Neutralization methods - Hazeltine neutralization, Neutrodyne neutralization, Neutralization using coil, Rice neutralization.
Wave shaping circuit - Introduction waveform shaping circuits, Non sinusoidal waveforms. High pass RC circuit - High pass RC network, High pass RC circuit for step input, High pass RC for ramp input, High pass RC for exponential input, RC differentiator circuit. Low pass RC circuit - Low pass RC circuit, Low pass RC circuit for step input, Low pass RC for ramp input, Low pass for exponential input, RC integrator circuit. Low pass RL circuit - Low pass RL Circuit, Step input, Pulse input, Ramp input, Condition for Low pass RL network as integrator. High pass RL circuit - High pass RL circuit, Step input, Pulse input, Ramp input. Clipper Circuit - Introduction of clipper, Classification of clipper, Applications of clippers. Positive clipper - Positive clipper, Series positive clipper, Shunt (Parallel) positive clipper (Slicer). Negative clipper - Negative clipper, Series type negative clipper, Shunt (Parallel) type negative clipper. Biased Clipper - Introduction of biased clipper, Parallel Positive clipper with reference voltage, Parallel negative clipper with reference voltage. Diode comparator - Introduction of Diode comparator. Clampers - Introduction of Clampers, Negative clamper, Operation of Negative clamper, Operation of Positive clamper, Applications of clampers. Sweep circuits - Introduction to sweep circuits, Basics of sweep waveform. Sweep generators - Introduction of sweep generators, Voltage sweep generators, Current sweep generators, Applications of sweep generators. Bootstrap sweep generator - Introduction of bootstrap sweep generator. Millers sweep generator - Miller time base generator, Miller integrator circuit. Current time base generator - Introduction of current time base generator, Application of current time base generator. Multivibrator - Introduction of multivibrator, Introduction of bistable multivibrator, Introduction of monostable multivibrator, Introduction of astable multivibrators, Applications of multivibrator. Collector coupled Astable multivibrator - Introduction of Astable multivibrator, Collector coupled Astable multivibrator. Collector coupled bistable multivibrator - Introduction of bistable multivibrator, Collector coupled bistable multivibrator. Collector coupled monostable multivibrator - Introduction of monostable multivibrator, Collector coupled Monostable multivibrator. Emitter Coupled multivibrators - Emitter Coupled Astable Multivibrator, Emitter coupled monostable multivibrator, Emitter coupled Bistable multivibrator. Triggering methods for Bistable multivibrator - Introduction for triggering methods for Bistable multivibrator, Unsymmetrical Triggering of Bistable Multivibrator, Unsymmetrical Triggering using Unilateral Device., Symmetrical Triggering of Bistable Circuit, Symmetrical Triggering without using Diodes. Schmitt Trigger circuits - Schmitt Trigger, Operation of circuit, Hysteresis, Application of Schmitt trigger, Designing the Schmitt Trigger.
Uni Junction Transistor (UJT) - Introduction to blocking oscillators, Unipolar Junction Transistor (UJT), Equivalent circuit of UJT, Working of UJT. Characteristics of UJT - Characteristics of UJT, UJT Relaxation Oscillator, Features of UJT, Applications of UJT. Pulse Transformer - Pulse Transformers, Practical equivalent circuit, Pulse response characteristics, Applications of pulse transformer. Free running blocking oscillator - Blocking oscillator. Astable blocking oscillator with base timing - Astable blocking oscillator with base timing. Push-pull astable blocking oscillator with emitter timing - Push-pull astable blocking oscillator with emitter timing. Frequency control using core saturation - Frequency control using core saturation. Triggered blocking oscillator - Triggered blocking oscillator, Monostable blocking oscillator with Base-Timing, Monostable blocking oscillator with Emitter Timing, Application of blocking oscillator. Voltage time base generator - Time base generator, Voltage Time-Base generator, Characteristics of voltage time-base waveform. Method of generating a voltage time base waveform - Method of generating a voltage time base waveform, Exponential charging, A transistor constant-current sweep, The Miller circuit, The bootstrap sweep, Inductor circuit, Compensation network. Current time base generator - Current time base generator, Linearity using constant current source, Generation of trapezoidal waveform. Practical transistor current time base generator - Practical transistor current time base generator.
