As you are looking for the Graduate Aptitude Test in Engineering Electronics & Communication engg cut off marks , here I am providing same for you (2014)

GENERAL--- 25

SC/ST/PD--16.67

OBC(Non-Creamy)-- 22.5

Total Appeared---2,16,367

GATE Electronics and Communication Engineering exam Syllabus—

Networks:It is the connection of electrical elements together. It include topics-Network graphs: matrices associated with graphs; incidence, fundamental cut set and fundamental circuit matrices. Network theorems: superposition, Wye-Delta transformation. Linear constant coefficient differential equations; time domain analysis of simple RLC circuits, Solution of network equations using Laplace transform: frequency domain analysis of RLC circuits. 2-port network parameters: driving point and transfer functions. State equations for networks. Thevenin and Norton’s maximum power transfer, Steady state sinusoidal analysis using phasors, Solution methods: nodal and mesh analysis

Electronic Devices: These are the physical entities in an electronic system use to affect the electrons.It include Topics- Carrier transport in silicon: diffusion current, mobility, and resistivity, drift current. Generation and recombination of carriers. p-n junction diode, , MOSFET, LED, p-I-n and avalanche photo diode, LASERs basics. Device technology includes integrated circuits fabrication process, diffusion ,oxidation, ion implantation, photolithography, p-tub,n-tub and twin-tub CMOS process, Energy bands in silicon, intrinsic and extrinsic silicon, Zener diode, tunnel diode, JFET, BJT, MOS capacitor
Analog Circuits:These are the circuits that uses continuous time voltages and current. It include topics-Small Signal Equivalent circuits of diodes, MOSFETs and analog CMOS , BJTs. Simple diode circuits, clamping, clipping, rectifier. Biasing and bias stability of transistor and FET amplifiers. Amplifiers includes single-and multi-stage, operational and differential, feedback, and power.. Simple op-amp circuits. Filters. Sinusoidal oscillators; criterion for oscillation; single-transistor and op-amp configurations ,Frequency response of amplifiers, Function generators and 555 Timers,wave shaping circuits. Power supplies.

Digital circuits: These are made from analog components which represent signal by the help of discrete values.It include topics- minimization of Boolean functions; Boolean algebra ,logic gates; digital IC families (DTL, TTL, ECL, MOS, CMOS). Combinatorial circuits includes arithmetic circuits, multiplexers,code convertors, decoders, PLAs and PROMs. Sequential circuits includes counters and shift-registers, latches and flip-flops,. Sample and hold circuits, DACs, ADCs. Semiconductor memories. Microprocessor(8085): architecture, memory and I/O interfacing, programming.

Signals and Systems:Signal conveys information which is generally a function of independent variable and system is the physical set of components/parts that carries a signal. It include topics-Definitions and properties of Laplace transform, continuous-time and discrete-time Fourier series, DFT and FFT, discrete-time and continous-time Fourier Transform, z-transform. Sampling theorem. Linear Time-Invariant (LTI) Systems includes definitions and properties; causality, impulse response, stability ,convolution, poles and zeros, frequency response, cascade and parallel structure, phase delay,group delay. Signal transmission through the LTI systems.

Control Systemsevices that are meant to manage,order,direct or supervise the behavior of other devices or systems. It include topics- Basic control system components; reduction of block diagrams , block diagrammatic description. Open loop and closed loop (feedback) systems and stability analysis of these systems;steady state and transient analysis of LTI control systems and frequency response ,Signal flow graphs and their use in determining transfer functions of systems. Tools and techniques for LTI control system analysis: Routh-Hurwitz criterion, root loci,Nyquist and Bode plots. Control system compensators:elements of Proportional-Integral-Derivative (PID) control ,elements of lead and lag compensation. State variable representation & solution of state equation of LTI control systems.

Communication: Refers to interaction. It include topics- Random signals and noise: probability, probability density function, random variables , power spectral density, random variables. Analog communication systems includes spectral analysis of the following operations, amplitude and angle modulation and demodulation systems, superheterodyne receivers; elements of hardware, realizations of analog communication systems; signal-to-noise ratio (SNR) calculations for amplitude modulation (AM) and frequency modulation (FM) for low noise conditions. Digital communication system includes pulse code modulation (PCM), differential pulse code modulation (DPCM), digital modulation schemes includes amplitude, phase and frequency shift keying schemes (ASK, FSK, PSK), matched filter receivers, bandwidth consideration and probability of error calculations for these schemes. Basics of FDMA, TDMA and GSM and CDMA. Fundamentals of information theory and channel capacity theorem

Electromagnetics: It refers to electromagnetism. It include topics -Elements of vector calculus includes divergence and curl; Maxwell’s equations: differential and integral forms, Gauss’ and Stokes’ theorems. Poynting vector ,Wave equation. Plane waves includes propagation through various media; reflection and refraction; skin depth phase and group velocity . Transmission lines: characteristic impedance; Smith chart; impedance matching, impedance transformation; S parameters, pulse excitation. Waveguides includes: modes in rectangular waveguides; cut-off frequencies; boundary conditions, dispersion relations. Basics of propagation in optical fibers and dielectric waveguide. Basics of Antennas includes: radiation pattern; Dipole antennas, antenna gain.