Question 1. How can sampling frequency introduce noise into a system measurement? Use appropriate graphs to highlight your answer.
Question 2. The following question relates to the design of Analogue to Digital Conversion (ADC) technologies
a) Draw the circuit schematics of 2 different ADC methods. Ensure all components and signals are labelled
b) Explain the principle of operation of each method presented in part a)
c) Explain two methods to control the timing of sampling to ensure consistent data capture rates. Include Pseudo code where appropriate.
Question 3. The following question relates to the design of Digital to Analogue Conversion (DAC) technologies
a) Draw the circuit schematics of 2 different DAC methods. Ensure all components and signals are labelled
b) Explain the principle of operation of each method presented in part a)
c) Briefly compare the two methods presented in part a). Your answer should refer to appropriate characteristics for assessing ADC technologies.
Question 4. The following questions relate to Digital to Analogue conversion techniques
a) Analogue output from a microcontroller can be achieved using either a DAC (Digital to Analogue Converter) or PWM (Pulse Width Modulation). Explain the principle of operation of each of these techniques using diagrams where appropriate.
b) Compare the two methods in part(a) considering cost, complexity and appropriateness in differing practical scenarios
c) Explain how the two methods can be implemented in a microcontroller environment. Use pseudo code where necessary to explain your answer.
Question 5. The following questions relate to noise introduction during digitisation of an analogue signal.
a) What is quantisation noise and sampling frequency noise? Explain your answer with appropriate graphs and comment on the effects on the signal
b) For both quantisation noise and sampling frequency noise, explain how to specify the requirements of an ADC solution to achieve an appropriate noise level
c) What are the key properties of an ideal sampling/quantisation system?
d) Explain how sampling frequency can be controlled using a microcontroller. Include pseudo code where appropriate