DIGITAL SIGNAL PROCESSING TEST QUESTIONS AND CORRECT ANSWERS

In a flash analog-to-digital converter, the output of each comparator is
connected to an input of a ________.

A. decoder
B. priority encoder
C. multiplexer
D. demultiplexer - ANSWER B

Which term applies to the maintaining of a given signal level until the next
sampling?

A. Holding
B. Aliasing
C. Shannon frequency sampling
D. "Stair-stepping" - ANSWER A

An op-amp has very ________.

A. high voltage gain
B. high input impedance
C. low output impedance
D. all of the above - ANSWER D

For a 4-bit DAC, the least significant bit (LSB) is ________.

A. 6.25% of full scale
B. 0.625% of full scale
C. 12% of full scale
D. 1.2% of full scale - ANSWER A

The dual-slope analog-to-digital converter finds extensive use in ________.

A. digital voltmeters
B. function generators

, C. frequency counters
D. all of the above - ANSWER D

The ADC0804 is an example of a ________.

A. single-slope analog-to-digital converter
B. dual-slope analog-to-digital converter
C. digital-ramp analog-to-digital converter
D. successive-approximation analog-to-digital converter - ANSWER D

In a digital representation of voltages using an 8-bit binary code, how many
values can be defined?

A. 16
B. 64
C. 128
D. 256 - ANSWER D

A 4-bit R/2R ladder digital-to-analog converter uses ________.

A. one resistor value
B. two resistor values
C. three resistor values
D. four resistor values - ANSWER B

A binary-weighted-input digital-to-analog converter has a feedback resistor, Rf,
of 12 k. If 50 uA of current is through the resistor, voltage out of the circuit is
________.

A. 0.6 V
B. -0.6 V
C. 0.1 V
D. -0.1 V - ANSWER B

The resolution of a 6-bit DAC is ________.

A. 63%
B. 64%