HW 1

Which edge in Figure 1-1 is the leading edge? 1 2 3 Both 1 and 3

1

What is the duty cycle of a digital waveform with a pulse width of 10 ms a period of 90 ms? 90% 10% 9% 11.1%

11.1%

The arrow in the figure below points to pin ________. 17 5 4 16

17

The approximate duty cycle for the digital waveform below is ________. 50% 80% 20% 30%

20%

An oscilloscope display indicates that the period of a digital waveform is 40 μs. What is frequency of this waveform? 40 MHz 25 kHz 2.5 kHz The frequency cannot be determined using the information provided

25 kHz

Which edge in Figure 1-1 is the trailing edge? 1 2 3 Both 1 and 3

3

The arrow in the figure below points to pin number ________. 13 5 12 4

5

Which one of the circuits listed is made up of flip-flops? A comparator A converter A multiplexer A register

A register

A circuit that converts an analog waveform to a digital signal is commonly called a(n) ________. CAD ADC DAC PLD

ADC

The symbol in Figure 1-3(A) represents the ________ function. OR AND NOT AND/OR

AND

Which circuit creates an output that indicates whether or not the input values are equal? Comparator Encoder Decoder Multiplexer

Comparator

A circuit that converts an digital signal to an analog waveform is commonly called a(n) ________. PLD CAD DAC ADC

DAC

Which circuit converts coded information into a noncoded form? Comparator Encoder Decoder Multiplexer

Decoder

Which circuit converts data from serial form to parallel form? Demultiplexer Encoder Multiplexer Comparator

Demultiplexer

Which circuit converts information into a specific coded form? Comparator Encoder Decoder Multiplexer

Encoder

A demultiplexer is sometimes called a mux. True or False

False

Clock signals carry pieces of information such as letters and numbers.

False

Parallel data is sent along a single conductor, one bit at a time.

False

The decimal number system uses nine different symbols.

False

The field that comprises both mechanical and electronic components is known as electro-mechanics.

False

On a negative-going pulse, ________. HIGH = 1 and LOW = 0 LOW = -1 and HIGH = 1 HIGH = 0 and LOW = -1 HIGH = 0 and LOW = 1

HIGH = 0 and LOW = 1

The symbol in Figure 1-3(C) represents the ________ function. OR NOT AND XOR

NOT

The symbol in Figure 1-3(B) represents the ________ function. OR NON AND XOR

OR

A flip-flop is a 1-bit storage device. True or False

True

A multiplexer converts parallel data to serial data. True or False

True

A sinusoidal waveform is an analog signal. True or False

True

A waveform that repeats itself at fixed intervals is called a periodic waveform.

True

Digital data can be processed and transmitted more efficiently and reliably than analog information.

True

Digital systems respond to voltage levels that change abruptly between two levels (high and low).

True

Encoders and decoders perform opposite conversions.

True

Serial data is sent along a single conductor, one bit at a time.

True

The amplitude of a digital waveform is the difference in voltage between the LOW and HIGH levels.

True

The binary number system uses just two symbols.

True

The clock signal synchronizes the other waveforms in a circuit.

True

The values of an analog signal flow smoothly from one to the next.

True

When both inputs to a 2-input OR gate are both LOW, the output is LOW.

True

When either input to a 2-input AND gate is LOW, the output is LOW.

True

When either input to a 2-input OR gate is HIGH, the output is HIGH.

True

When the input to a logic inverter is HIGH, the output is LOW.

True

When the inputs to a 2-input AND gate are both HIGH, the output is HIGH.

True

The output from an AND gate is HIGH when ________. all inputs are LOW all inputs are HIGH one input is HIGH and the remaining inputs are LOW one input is LOW and the remaining inputs are HIGH

all inputs are HIGH

A periodic digital waveform ________. repeats itself at a fixed interval has both a HIGH and LOW levels has a duty cycle all of the above

all of the above

Item (1) of the nonideal pulse in Figure 1-2 represents the waveform ________. pulse width period amplitude transition time

amplitude

Of the circuits listed, the one that is most likely to be found in a CD player is a(n) ________. programmable logic device digital-to-analog converter SPLD analog-to-digital converter

digital-to-analog converter

Item (4) of the nonideal pulse in Figure 1-2 represents the waveform ________. amplitude rise time fall time pulse width

fall time

On a digital waveform, the transition time from a HIGH level to a LOW level is called ________. period rise time pulse width fall time

fall time

On a positive-logic pulse, the trailing edge is the ________. falling edge positive-going edge rising edge LOW-to-HIGH transition

falling edge

Two kinds of data selectors are ________ and ________. encoders, decoders multiplexers, demultiplexers comparators, registers adders, subtractors

multiplexers, demultiplexers

On a negative-going pulse, the leading edge is the ________. positive-going edge negative-going edge rising edge LOW-to-HIGH transition

negative-going edge

The output from an OR gate is LOW ________. only when all inputs are HIGH whenever any input is HIGH only when all inputs are LOW none of the above

only when all inputs are LOW

The time from one leading edge on a digital waveform to the next is the waveform ________. period pulse width fall time rise time

period

On a negative-logic pulse, the trailing edge is the ________. negative-going edge positive-going edge falling edge HIGH-to-LOW transition

positive-going edge

On a positive-going pulse, the leading edge is the ________. positive-going edge HIGH-to-LOW transition negative-going edge falling edge

positive-going edge

Item (3) of the nonideal pulse in Figure 1-2 represents the waveform ________. amplitude rise time fall time pulse width

pulse width

The time between transition 1 and transition 3 in Figure 1-1 is the ________. frequency period pulse width amplitude

pulse width

Item (2) of the nonideal pulse in Figure 1-2 represents the waveform ________. amplitude rise time fall time pulse width

rise time

On a digital waveform, the transition time from a LOW level to a HIGH level is called ________. rise time period pulse width fall time

rise time

When data is set along a single conductor, it is referred to as ________. simultaneous data parallel data serial data none of these

serial data

The output from an OR gate is HIGH ________. only when all inputs are LOW only when all inputs are HIGH when at least one input is HIGH none of the above

when at least one input is HIGH

The output from an AND gate is LOW ________. only when all inputs are LOW only when all inputs are HIGH when at least one input is LOW none of the above

when at least one input is LOW