ADC Flashcards
Select which of the following occurs within an ADC (tick all that apply):
1) Sampling
2) Quantisation
3) Transduction
4) Inversion
Sampling
Quantisation
An ADC should quantise a continuous signal differently to how it quantises a single value.
True False
False
What is the typical sample rate and data size of a CD-quality audio signal?
8-bits and 48kHz
256kHz and 32-bits
44.1kHz and 16-bits
20-bits and 24kHz
44.1kHz and 16-bits
Nyquist’s theorem states that perfect reconstruction may be possible if the signal is sampled how fast?
With at least 2x as many bits as the signal should have
At least 48kHz
At least 2x faster than the highest frequency component
As fast as the ADC can sample
At least 2x faster than the highest frequency component
If an input signal to an ADC raises slightly above Vref, then it is
Ignored until the voltage drops below Vref
Destroyed
Measured as a 0
Clipped
Clipped
Quantization process is generally __________ and results in information __________ .
irreversible, gain
reversible, gain
reversible, loss
irreversible, loss
irreversible, loss
When referring to an ADC, quantisation means
The biggest (maximum) value that the sample can reach
The sample is converted to analogue by a DAC
The sample rate at which a sample is converted to digital
The number of discrete levels used to represent a sample
The number of discrete levels used to represent a sample
A signal that ranges from 0v to 3.3v is fed into a 7-bit ADC. What is the representation of sampled analog voltage of 0.12V? (Assume the error is between 0 to 1 least significant bit)
0x04
001 0010b
000 0110b
0x12
0x04
A transducer
Always crosses between analogue and digital domains
Converts a signal from one form into another
Channels the energy emitted by the Tesseract
Is a digital device used to measure voltage
Converts a signal from one form into another
