Digital Techniques - Data conversion

A transducer converts?

• Electrical variable to Physical variable

• Physical variable to Electrical variable

• DC voltage to AC voltage

What is the Actuator directly connected to?

• A device to control the physical variable

• An ADC

• Transducer

What are Operational Amplifiers used for?

• Comparators to compare amplitude of one voltage with another

• Converting digital signals to analogue signals

• Lower an input voltage to avoid electrical breakdown

A general characteristic of an IC version OP amps are?

• High output impedance, Low input impedance

• Split supply

• Low Gain, on the order of a million.

Maximum positive level output on a zero level detector is found where on the Sine wave?

• When the sine wave input crosses zero

• When the sine wave is negative

• When the sine wave is positive

What can be used to set a reference voltage in a zero-level detector?

• Zener Diode

• Thermistor

• Varactor

What happens to the output voltage if the input voltage exceeds the reference voltage on a non-zero level detector?

• Maximum positive voltage

• Maximum negative voltage

• Cancel out

A comparator

• Compares two input voltages and produces an output voltage

• Compares an input to output voltage

• Compares two output voltages from two input voltages

Analogue to digital conversion process us generally more complex and time consuming than digital to analogue process.

• True

• False

What is a disadvantage of a Flash A/D Converter

• Expensive due to an exponential increase with the number of binary bits used to store the code.

• Requires very high speed beyond majority of operating regions.

• System is poor at storing code