Virtual Labs

Design of D-Latch using SPICE Code

In an NGSPICE simulation of a D-Latch with pass transistor multiplexer, which statement correctly defines the pass transistor behavior?

a: The pass transistors act as amplifiers. Explanation

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b: The pass transistors allow or block the flow of data based on the control signal. Explanation

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c: The pass transistors store data in the latch. Explanation

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d: The pass transistors control the clock signal. Explanation

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In NGSPICE, how is the D-Latch clock signal usually defined in the simulation netlist?

a: CLK = PULSE(0 1 0 1ns 1ns 1ns 2ns) Explanation

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b: CLK = VDD Explanation

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c: CLK = 1 Explanation

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d: CLK = SIN(0 1 1GHz) Explanation

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In NGSPICE, what does the '.tran' statement typically represent in a simulation netlist?

a: Transient analysis duration Explanation

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b: Transistor parameters Explanation

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c: Transfer function Explanation

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d: Transistor type Explanation

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What is the purpose of including parasitic capacitance in the NGSPICE simulation of a D-Latch circuit?

a: To slow down the clock signal Explanation

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b: To model the capacitance in the pass transistors Explanation

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c: To reduce power consumption Explanation

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d: To simplify the simulation Explanation

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How does the NGSPICE '.include' statement contribute to the simulation of a D-Latch circuit?

a: It defines the clock signal Explanation

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b: It imports additional netlist files Explanation

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c: It specifies transistor parameters Explanation

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d: It sets up the transient analysis Explanation

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In NGSPICE, what is the significance of the '.options' statement in a simulation netlist?

a: It defines the latch structure Explanation

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b: It sets simulation options and parameters Explanation

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c: It controls input selection Explanation

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d: It specifies transistor types Explanation

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How is the pass transistor multiplexer usually modeled in NGSPICE for a D-Latch circuit?

a: Using behavioral voltage sources Explanation

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b: As a linear resistor Explanation

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c: With lumped capacitance Explanation

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d: As a behavioral current source Explanation

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What is the role of the '.control' block in an NGSPICE simulation netlist?

a: Defines the latch output Explanation

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b: Provides feedback to the pass transistors Explanation

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c: Specifies transient analysis parameters Explanation

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d: Allows customization and scripting of simulation Explanation

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What is the significance of the 'VDD' node in an NGSPICE simulation netlist of a D-Latch circuit?

a: It represents the clock signal Explanation

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b: It defines the latch output Explanation

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c: It specifies the power supply voltage Explanation

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d: It controls the pass transistors Explanation

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How does the NGSPICE '.measure' statement contribute to the analysis of a D-Latch simulation?

a: It defines the latch output Explanation

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b: It provides feedback to the pass transistors Explanation

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c: It calculates specific circuit parameters during simulation Explanation

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d: It sets simulation options Explanation

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What happens if the clock signal in a D-Latch circuit glitches (briefly goes high then low)?

a: Latch may capture unintended data Explanation

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b: Latch output remains unchanged Explanation

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c: Latch output is always reset Explanation

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d: Latch enters a transparent state permanently Explanation

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If the data input changes just as the clock transitions from high to low, what is the expected output of the D-Latch?

a: Output may be metastable Explanation

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b: Output always follows the new data Explanation

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c: Output always holds the previous data Explanation

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d: Output is undefined Explanation

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What is the effect of a slow clock edge (slow rise/fall time) on the operation of a D-Latch?

a: Latch may become transparent for longer than intended Explanation

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b: Latch output is unaffected Explanation

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c: Latch always resets Explanation

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d: Latch output is inverted Explanation

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