1. Which signal is sampled at regular intervals for the purpose of ADC?
A. analog signal
B. digital signal
C. quantized signal
D. sampled signal
Answer: A
The analog signal is sampled at regular intervals for the analog to digital conversion. Each sample is then quantized to divided by a given value in order to identify the number of approximate analog values.
2. Which factor depends on the quantization error?
A. number of error
B. the number of bits
C. size of the error
D. conversion process
Answer: B
The quantization error depends on the number of bits which is used to represent the analog value.
Quantization error is the difference between the analog signal and the closest available digital value at each sampling instant from the A/D converter.
3. Which is the first type of error caused during the conversion process?
A. sampling error
B. interrupt signal
C. counter error
D. quantization error
Answer: D
The quantization error is the first type of error caused in the conversion process. This error is caused because the samples are converted to a slightly higher value instead of zero.
4. Which of the following defines the number of samples that are taken in the time period?
A. sample size
B. sample nature
C. sample rate
D. sample frequency
Answer: C
The sample rate is defined by the number of samples that are taken in a time period. The sample rate is usually measured in Hertz. It can determine the speed of the conversion device itself.
5. Which of the following can determine the speed of the conversion device itself?
A. sample rate
B. sampled data
C. sample size
D. sample nature
Answer: A
The sample rate determines the various aspect of the conversion process and one such is the conversion speed.
6. Which of the following can determine the maximum frequency that can be converted?
A. sample frequency
B. sample rate
C. sample size
D. sample nature
Answer: B
The sample rate can determine the maximum frequency that can be converted as per the Nyquist theorem. The theorem states that the minimum sampling rate frequency should be twice the maximum frequency of the analog signal.
7. Which term determines the random timing error?
A. jitter
B. quantization error
C. sample error
D. delay
Answer: A
Jitter is a random timing error. Jitter can cause irregular sampling errors.
Jitter is the measure of timing performance. High jitter means poor timing performance in most cases.
This primer provides an overview of jitter and offers practical assistance in taking jitter measurements.
8. Which of the following introduces a phase error?
A. conversion time
B. sampling rate
C. sample size
D. sample nature
Answer: A
The conversion time always introduces a phase error. The conversion time will delay the digital output and hence introduce a phase error.
9. Which of the following can generate an interrupt?
A. timer
B. trigger
C. delay
D. counter
Answer: A
The timer can generate an interrupt to the processor at the rate of sampling frequency.
Timers can generate certain two interrupts:
OVERFLOW interrupt
COMPARE MATCH interrupt.
10. Which filter is used for filtering out the high-frequency components?
A. bandpass filter
B. band-reject filter
C. analog filter
D. digital filter
Answer: C
The higher frequency components can be filtered out by using an analog filter after sampling.
An analog filter that removes all signals below a certain frequency is a high pass filter because it lets pass everything higher than the cutoff frequency.
