71 lines
3.1 KiB
Markdown
71 lines
3.1 KiB
Markdown
E6C Digital ICs: families of digital ICs; gates; programmable logic devices
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- [[E6C01]] (A)
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What is the function of hysteresis in a comparator? #card
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- [[A.]] To prevent input noise from causing unstable output signals
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- [[B.]] To allow the comparator to be used with AC input signals
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- [[C.]] To cause the output to continually change states
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- [[D.]] To increase the sensitivity
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- [[E6C02]] (B)
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What happens when the level of a comparator’s input signal crosses the threshold voltage? #card
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- [[A.]] The IC input can be damaged
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- [[B.]] The comparator changes its output state
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- [[C.]] The reference level appears at the output
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- [[D.]] The feedback loop becomes unstable
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- [[E6C03]] (A)
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What is tri-state logic? #card
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- [[A.]] Logic devices with 0, 1, and high-impedance output states
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- [[B.]] Logic devices that utilize ternary math
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- [[C.]] Logic with three output impedances which can be selected to better match the load impedance
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- [[D.]] A counter with eight states
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- [[E6C04]] (C)
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Which of the following is an advantage of BiCMOS logic? #card
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- [[A.]] Its simplicity results in much less expensive devices than standard CMOS
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- [[B.]] It is immune to electrostatic damage
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- [[C.]] It has the high input impedance of CMOS and the low output impedance of bipolar transistors
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- [[D.]] All these choices are correct
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- [[E6C05]] (D)
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Which of the following digital logic families has the lowest power consumption? #card
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- [[A.]] Schottky TTL
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- [[B.]] ECL
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- [[C.]] NMOS
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- [[D.]] CMOS
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- [[E6C06]] (C)
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Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply? #card
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- [[A.]] Large bypass capacitance is inherent
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- [[B.]] The input switching threshold is about twice the power supply voltage
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- [[C.]] The input switching threshold is about half the power supply voltage
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- [[D.]] Bandwidth is very limited
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- [[E6C07]] (B)
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What best describes a pull-up or pull-down resistor? #card
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- [[A.]] A resistor in a keying circuit used to reduce key clicks
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- [[B.]] A resistor connected to the positive or negative supply used to establish a voltage when an input or output is an open circuit
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- [[C.]] A resistor that ensures that an oscillator frequency does not drift
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- [[D.]] A resistor connected to an op-amp output that prevents signals from exceeding the power supply voltage
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- [[E6C08]] (B)
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In Figure [[E6-3]], which is the schematic symbol for a NAND gate? #card
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- [[A.]] 1
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- [[B.]] 2
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- [[C.]] 3
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- [[D.]] 4
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- [[E6C09]] (B)
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What is used to design the configuration of a field-programmable gate array (FPGA)? #card
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- [[A.]] Karnaugh maps
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- [[B.]] Hardware description language (HDL)
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- [[C.]] An auto-router
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- [[D.]] Machine and assembly language
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- [[E6C10]] (D)
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In Figure [[E6-3]], which is the schematic symbol for a NOR gate? #card
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- [[A.]] 1
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- [[B.]] 2
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- [[C.]] 3
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- [[D.]] 4
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- [[E6C11]] (C)
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In Figure [[E6-3]], which is the schematic symbol for the NOT operation (inversion)? #card
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- [[A.]] 2
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- [[B.]] 4
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- [[C.]] 5
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- [[D.]] 6 |