Test on Fundamentals of Digital Signal Processing

Question 1: The original continuous time signal can be fully reconstructed from its samples if the sampling rate is high enough, according to the Sampling Theorem.

A. Ano

B. Ne

Explanation: The study materials state that the original continuous time signal can be fully reconstructed from the samples using interpolation if the sampling rate is high enough. This is a core principle of the Sampling Theorem.

Question 2: Which statement accurately describes a key principle of the Successive Approximation ADC (SA ADC) operation as presented in the study materials?

A. It directly converts the input signal to a digital thermometer code using multiple comparators.

B. It determines the digital output bit by bit, starting with the Most Significant Bit (MSB), based on an interval bisection method.

C. It relies on a long chain of resistors to produce a binary-weighted output voltage for direct comparison.

D. It converts the analog signal by varying the pulse width to represent the signal's amplitude.

Explanation: The study materials state that the SA ADC operation is 'based on interval bisection method' and that 'Each step – one bit, starting MSB'. It iteratively compares a DAC output with the input voltage to narrow down the range, thereby determining each bit of the digital representation. The other options describe principles of different ADC types (Flash ADC for thermometer code, Binary weighted DAC principle) or PWM, not the SA ADC.

Question 3: The ADS1115 ADC module communicates using I2C.

A. Ano

B. Ne

Explanation: The RPI - ADS1115 - ADC module is explicitly stated to use I2C communication.

Question 4: The MCP3202 chip itself has a maximum ADC sampling rate of 800 SPS.

A. Ano

B. Ne

Explanation: The MCP3202 chip itself has a maximum ADC sampling rate of 50 kSPS, whereas 800 SPS is the maximum for the ADS1115 chip.

Question 5: According to the study materials, which statement accurately describes the MCP4822 chip?

A. It is a 12-bit Digital-to-Analog Converter.

B. It uses I2C for communication.

C. It is an Analog-to-Digital Converter.

D. It communicates using SPI.

Explanation: The study materials state that the MCP4822 chip is a '12 bits DAC based on MCP4822 chip' and uses 'SPI communication'. Therefore, it is a 12-bit Digital-to-Analog Converter that communicates via SPI.