What is the function of hysteresis in a comparator?

  1. To prevent input noise from causing unstable output signals
  2. To allow the comparator to be used with AC input signals
  3. To cause the output to change states continually
  4. To increase the sensitivity


What happens when the level of a comparator's input signal crosses the threshold?

  1. The IC input can be damaged
  2. The comparator changes its output state
  3. The comparator enters latch-up
  4. The feedback loop becomes unstable


What is tri-state logic?

  1. Logic devices with 0, 1, and high-impedance output states
  2. Logic devices that utilize ternary math
  3. Low-power logic devices designed to operate at 3 volts
  4. Proprietary logic devices manufactured by Tri-State Devices


Which of the following is an advantage of BiCMOS logic?

  1. Its simplicity results in much less expensive devices than standard CMOS
  2. It is immune to electrostatic damage
  3. It has the high input impedance of CMOS and the low output impedance of bipolar transistors
  4. All these choices are correct


What is an advantage of CMOS logic devices over TTL devices?

  1. Differential output capability
  2. Lower distortion
  3. Immune to damage from static discharge
  4. Lower power consumption


Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply?

  1. Large bypass capacitance is inherent
  2. The input switching threshold is about two times the power supply voltage
  3. The input switching threshold is about one-half the power supply voltage
  4. Bandwidth is very limited


What best describes a pull-up or pull-down resistor?

  1. A resistor in a keying circuit used to reduce key clicks
  2. A resistor connected to the positive or negative supply line used to establish a voltage when an input or output is an open circuit
  3. A resistor that ensures that an oscillator frequency does not drift
  4. A resistor connected to an op-amp output that prevents signals from exceeding the power supply voltage


In Figure E6-3, what is the schematic symbol for a NAND gate?

  1. 1
  2. 2
  3. 3
  4. 4
Circuit Diagram


What is a Programmable Logic Device (PLD)?

  1. A logic circuit that can be modified during use
  2. A programmable collection of logic gates and circuits in a single integrated circuit
  3. Programmable equipment used for testing digital logic integrated circuits
  4. A type of transistor whose gain can be changed by digital logic circuits


In Figure E6-3, what is the schematic symbol for a NOR gate?

  1. 1
  2. 2
  3. 3
  4. 4
Circuit Diagram


In Figure E6-3, what is the schematic symbol for the NOT operation (inverter)?

  1. 2
  2. 4
  3. 5
  4. 6
Circuit Diagram