ADC Flashcards

1
Q

Select which of the following occurs within an ADC (tick all that apply):

1) Sampling

2) Quantisation

3) Transduction

4) Inversion

A

Sampling

Quantisation

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2
Q

An ADC should quantise a continuous signal differently to how it quantises a single value.

True
False
A

False

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3
Q

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

A

44.1kHz and 16-bits

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4
Q

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

A

At least 2x faster than the highest frequency component

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5
Q

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

A

Clipped

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6
Q

Quantization process is generally __________ and results in information __________ .

irreversible, gain

reversible, gain

reversible, loss

irreversible, loss

A

irreversible, loss

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7
Q

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

A

The number of discrete levels used to represent a sample

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8
Q

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

A

0x04

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9
Q

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

A

Converts a signal from one form into another

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