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Oct 31, 2014

Analog Electronics : Important Topics for GATE EC

Analog is one of the most important subject for ECE and also since it is a core subject so it becomes much more important that this subject be covered in detail. But many GATE Aspirants are often confused as to what specifically we need to study from this subject as this subject is very vast in itself. So, to reduce the effort we need to target the topics that are specific to GATE.

Diode: Rectifiers (Half wave, Full wave and Centre tapped) – ripple frequency, ripple factor, PIV, rectification efficiency, TUF ( Transformer Utilisation Factor ), conduction angle, DC current, Thevenin equivalent circuit, comparison of three ( half, full and centre tapped) | Peak detector – surge current | Clipper – positive, negative, two level | Clamper – positive, negative, voltage doubler

Transistors: BJT theory – CB, CC and CE configuration – Input-ouput and transfer characteristics | Early effect | Eber’s Moll model | Active, Cut-off, Saturation and Reverse Active mode | Concept of ICO, ICBO, ICEO | Biasing and Stabilization – CB biased, Self biased, Diode compensation, Thermistor and Sensitor compensation | Voltage regulation – Line variation, Load regulation, Zener ckt, BJT ckt, IC ckt | Current Mirror | Miller’s theorem |Small signal analysis - Hybrid Model, Approximated hybrid model, Pi – Model, T – Model, re model | High frequency analysis – Unity gain frequency (fT), fβ, fα | FETs - Small signal model – expression for Id, gain,| Biasing – self bias, drain-gate biasing

Amplifiers: Cascaded amplifiers – fH, fL, Bandwidth formulas | Darlington pair - super β transistor, biasing problem, bootstrap | RC coupled amplifier – Frequency response | Cascoded amplifiers | Direct coupled amplifiers | Emitter coupled differential amplifier | Tuned amplifier |

Feedback: Basics | Different configuration – voltage amplifier, current amplifier, transconductance amplifier, transresistance amplifier | Desensitivity | Current and voltage sampling, Voltage and current mixing

Oscillators: Barkhausen criteria | Audio Frequency oscillator – RC, Wein bridge and Phase shift | Radio Frequency oscillator – Hartley, Colpitt, Clapp, Crystal | Figure of merit and Frequency stability criteria

Power amplifiers: Thermal runaway – concept, expression | Harmonic distortion | Class A, B, AB and C amplifiers – advantages, disadvantages, area of operation, cross over distortion, efficiency | Push-pull amplifiers

OP-AMP: Basic theory – properties, Slew rate, CMRR, Offset voltage and current,  Biasing voltage and current, Transfer characteristics | Ideal and Practical Op-amp | Different configurations – Inverting, Non-inverting, Summer, Integrator, Differentiator, Log and Antilog amplifier, Voltage follower | Current to voltage converter and vice versa | Filters – Lowpass, Highpass, Allpass, Bandpass, Bandstop, Butterworth | Frequency response – cutoff frequency | Schmitt trigger – Hysterisis loop | Precision rectifiers

Multivibrators: Bistable, Astable and monostable vibrators using BJT, Op-amp and 555 timer IC – time period derivation, calculation of stable state current and voltage, transition time

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