Elec 5 AQA

Some of the Key Points of the Elec 5 AQA Specification

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  • Created by: Joey
  • Created on: 26-05-13 15:11
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  • Elec 5 AQA
    • Transmission Media
      • Twisted Pair
      • Coaxial Cable
      • Fibre Optics
        • Total Internal Reflection
        • Laser Diode to Transmit
        • Photodiode to Receive
        • Output pulse isn't sharp
      • Need to know how to draw cross section of each
    • Multiplexing
      • Allows more information to pass over a medium
      • FDM - Frequency Division
        • Seperate Carrier Frequency for each signal
        • Analogue and Digital
      • TDM - Time Division
        • Digital only
        • Seperate time slot for each signal
        • Several Signals being sent one after the other in time
    • Signal Degradation
      • Attentuation
        • Radiation
      • Crosstalk
        • Interference from adjacent cables
      • Untitled
      • Distortion
        • Signals Produced and added to a signal as it travels
      • Noise
        • Random signals added to a signal as it travels
      • Dispersion
        • Different Frequencies travel at different speeds
    • Tuned Circuit
      • Resonance when XL = XC
    • Simple Receiver
      • Poor Selectivity
      • Poor Sensitivty
        • As there is no amplification
    • Superhet Receiver
      • Aerial
        • Mixer
          • If Amplifier
            • Demodulator
              • AF Amplifier
                • Loudspeaker
                • Non-Inverting Op Amp
    • Modulation
      • PWM - Pulse Width Modulation
      • PAM - Pulse Amplitude Modulation
      • PPM - Pulse Position Modulation
      • PCM - Pulse Code Modulation
    • Serial Transmission
      • Serial Vs Parallel
      • Half Duplex - Only one medium needed
      • Start bit , Stop bits, Parity bit
      • Shift Register with D type Flip-Flops
    • Multiplexer
      • Need to know how to draw with AND gates
    • Low Pass Filter
      • Input Resistor on inverting input
      • Capacitor and Resistor on feedback
    • Packet Switching
      • Checksum is to check whether data is corrupt
      • Destination Address is to specify where data is to be sent
      • Items that could be in packet header
        • Checksum
        • Destination Address
        • Source of Address
        • Length of Data
        • Protocol used
      • Has Improved security compared to other links

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