Digital Logic Design Exam Study Set | 210
QUESTIONS and 100% Correct Answers Updated
2024-2025
Match the engineer and scientist's names with what they did.
1 Viterbi
2 Reed-Solomon
3 Hamming
4 Huffman
5 Shannon - ✔✔1. error correction decoding from trellis encoded data
2. error detection encoding.
3. Developer of the notion of a distance measure for incorrect bits in a received word.
4. Implemented a scheme to match probabilities to variable-length codewords.
5. Known as the father of information theory.
what are the advantages of using voltage as a representation scheme? - ✔✔potentially low power in
steady state.
The goal of modular design is abstention. - ✔✔False, abstraction
What maintains the obligations and responsibilities of every system component? - ✔✔Contracts
is it true that we must design our systems to tolerate some amount of error if they are to process
information reliably? - ✔✔True
a system is a structure that is guaranteed to exhibit ________, assuming all of its components obey their
specified behaviors. - ✔✔a specified behavior
,what does the C statement int rand(void) mean? - ✔✔Function prototype of rand function.
which of the following are important aspects of digital logic design? - ✔✔1. understanding behavior
without knowing implementation
2. predictable composition of functions
The VTC of a buffer is: - ✔✔nonlinear and with a gain > 1
The VTC measures - ✔✔static behavior
Does a wire obey the static discipline? - ✔✔No
Can a combinational device contain directed cycles? - ✔✔No
What does "predictable composition" mean? - ✔✔If the parts work, the whole thing works.
what does the VTC acronym mean? - ✔✔Voltage Transfer Characteristic
a combinational device is a circuit element that has: - ✔✔1. One or more digital outputs
2. One or more digital inputs
3. A functional specification
How do we implement devices with high reliability? - ✔✔We use a representation convention that
forbids a range of voltages between 0 and 1
what are sources of power supply noise? - ✔✔IR drop
L(dl/dt) drop
What must accept marginal inputs and provide unquestionable outputs? - ✔✔Combinational device
, If we design a system with lots of gain, what will that buy us? - ✔✔A big noise margin.
Current flows between the diffusion terminals in a MOSFET if the voltage on the gate terminal is such
that it creates a conducting "channel", otherwise the MOSFET is off and the current does not flow
between the diffusion terminals. - ✔✔True
What are the four terminals of a Field Effect Transistor? - ✔✔Gate, source, drain, and bulk
What kind of FET is described by figure X? (Gate with no inverter attached to ground) - ✔✔NFET
What kind of gate is described by figure Y? - ✔✔NAND Gate
What kind of gate is described by figure Z? - ✔✔NOR gate
In the general CMOS gate recipe, the output node is always a low-impedance node in the steady state. -
✔✔True
PFETs are used in pull-up circuits while NFETs are used in negating circuits. - ✔✔False, NFETs are used
in pull-down circuits.
what kind of pullup and pulldown logic do we want such that the pulldown is on when the pullup is off? -
✔✔Complimentary
What kind of bound is Tpd on time from input to output? - ✔✔Upper
A lenient device... - ✔✔...tolerates transitions and invalid levels on irrelevant inputs.
A lenient combinational device... - ✔✔...is where the output is guaranteed to be valid when any
combination of inputs sufficient to determine the output value has been valid for at least Tpd.
QUESTIONS and 100% Correct Answers Updated
2024-2025
Match the engineer and scientist's names with what they did.
1 Viterbi
2 Reed-Solomon
3 Hamming
4 Huffman
5 Shannon - ✔✔1. error correction decoding from trellis encoded data
2. error detection encoding.
3. Developer of the notion of a distance measure for incorrect bits in a received word.
4. Implemented a scheme to match probabilities to variable-length codewords.
5. Known as the father of information theory.
what are the advantages of using voltage as a representation scheme? - ✔✔potentially low power in
steady state.
The goal of modular design is abstention. - ✔✔False, abstraction
What maintains the obligations and responsibilities of every system component? - ✔✔Contracts
is it true that we must design our systems to tolerate some amount of error if they are to process
information reliably? - ✔✔True
a system is a structure that is guaranteed to exhibit ________, assuming all of its components obey their
specified behaviors. - ✔✔a specified behavior
,what does the C statement int rand(void) mean? - ✔✔Function prototype of rand function.
which of the following are important aspects of digital logic design? - ✔✔1. understanding behavior
without knowing implementation
2. predictable composition of functions
The VTC of a buffer is: - ✔✔nonlinear and with a gain > 1
The VTC measures - ✔✔static behavior
Does a wire obey the static discipline? - ✔✔No
Can a combinational device contain directed cycles? - ✔✔No
What does "predictable composition" mean? - ✔✔If the parts work, the whole thing works.
what does the VTC acronym mean? - ✔✔Voltage Transfer Characteristic
a combinational device is a circuit element that has: - ✔✔1. One or more digital outputs
2. One or more digital inputs
3. A functional specification
How do we implement devices with high reliability? - ✔✔We use a representation convention that
forbids a range of voltages between 0 and 1
what are sources of power supply noise? - ✔✔IR drop
L(dl/dt) drop
What must accept marginal inputs and provide unquestionable outputs? - ✔✔Combinational device
, If we design a system with lots of gain, what will that buy us? - ✔✔A big noise margin.
Current flows between the diffusion terminals in a MOSFET if the voltage on the gate terminal is such
that it creates a conducting "channel", otherwise the MOSFET is off and the current does not flow
between the diffusion terminals. - ✔✔True
What are the four terminals of a Field Effect Transistor? - ✔✔Gate, source, drain, and bulk
What kind of FET is described by figure X? (Gate with no inverter attached to ground) - ✔✔NFET
What kind of gate is described by figure Y? - ✔✔NAND Gate
What kind of gate is described by figure Z? - ✔✔NOR gate
In the general CMOS gate recipe, the output node is always a low-impedance node in the steady state. -
✔✔True
PFETs are used in pull-up circuits while NFETs are used in negating circuits. - ✔✔False, NFETs are used
in pull-down circuits.
what kind of pullup and pulldown logic do we want such that the pulldown is on when the pullup is off? -
✔✔Complimentary
What kind of bound is Tpd on time from input to output? - ✔✔Upper
A lenient device... - ✔✔...tolerates transitions and invalid levels on irrelevant inputs.
A lenient combinational device... - ✔✔...is where the output is guaranteed to be valid when any
combination of inputs sufficient to determine the output value has been valid for at least Tpd.
