BTEC HND Level 3 Unit 23: Digital and Analogue Electronic Systems assignments answers

Digital and analogue electronic systems are two different ways of representing information.

Analogue electronic systems use a continuously variable signal to represent information, while digital electronic systems use a discrete (discontinuous) signal to represent information.

The difference between digital and analogue is best explained with an example. Consider the sound of a piano. The sound of a piano can be thought of as a waveform that varies in amplitude (height) over time. This waveform can be represented on an oscilloscope as an analogue signal. Now consider the note “A” on a piano. This note has a frequency of 440 Hz (cycles per second). If we sampled the waveform 44,100 times per second (the sample rate of CD audio), we could create a digital representation of the note “A”.

The key difference between analogue and digital is that an analogue signal is continuous, while a digital signal is discrete. This means that an analogue signal can take on any value within its range, while a digital signal can only take on one of a finite number of values.

Assignment Activity 1: Examine the principles of analogue and digital electronic systems as applied in industry.

There are a few key principles that separate analogue and digital electronic systems. Analogue electronics are based on continuous signals, whereas digital electronics are based on discontinuous signals.

Analogue circuits can represent any real-world continuous signal, whereas digital circuits can only represent a finite number of discrete voltage levels. This is why an analogue signal can be faithfully reproduced by passing it through an appropriate resistor, whilst a digital signal will produce square waves with all the harmonics removed.

Analogue systems have the advantage of being linear, whereas digital systems are non-linear (due to the use of logic gates). This often leads to distortion in digital signals, but this distortion can be eliminated by applying a suitable correction filter. Digital systems are also more immune to noise than analogue systems.

Assignment Activity 2: Explore the characteristics of analogue, digital and mixed electronic systems, and the role of signal conversion in control applications.

Analogue systems are those where a continuous range of signal values is represented by a signal that travels through wires, cables, or other media. In contrast, digital systems represent information as a series of discrete values (pulses), and mixed systems use both analogue and digital signals to represent information.

Analogue signals can be converted into digital signals by using an A/D converter. Similarly, digital signals can be converted into analogue signals by using a D/A converter. The primary role of signal conversion in control applications is to allow the use of controllers that are specifically designed for digital control (such as microprocessors) to control analogue devices (such as motors or valves).

Assignment Activity 3: Carry out fault finding safely on complex electronic systems as applied in industry.

In order to safely carry out fault finding on complex electronic systems, it is important to have a thorough understanding of how the system works and what each component does.

It is also necessary to have a good understanding of circuit theory and be able to read schematics. Once you understand how the system works, you can start looking for faults by systematically testing each component in turn.

If you suspect that a component is faulty, then you should try replacing it with a known-good part to see if the problem goes away. If it does, then you know that the original part was bad. If not, then you need to continue your search for the faulty component.

By following these guidelines, you can safely and effectively troubleshoot complex electronic systems.

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