Linear Integrated Circuits: Common Types and Applications
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Questions and Answers

What is the primary function of voltage regulators?

  • To amplify low-level signals with high common-mode rejection
  • To provide a stable output voltage regardless of changes in input voltage or load conditions (correct)
  • To compare two input voltages and produce an output
  • To measure current flow through a shunt resistor and provide a proportional voltage output

    • What type of linear IC is designed for amplifying low-level signals with high common-mode rejection?

  • Current Sense Amplifiers
  • Voltage Regulators
  • Instrumentation Amplifiers (correct)
  • Operational Amplifiers (Op-Amps)

    • What is the primary application of current sense amplifiers?

  • Active filters
  • Power management (correct)
  • Signal conditioning
  • Threshold detectors

    • What type of linear IC can be used in various configurations, including inverting/non-inverting amplifiers, integrators, and differentiators?

    <p>Operational Amplifiers (Op-Amps)</p> Signup and view all the answers

    What is the primary function of comparators?

    <p>To compare two input voltages and produce a high or low output depending on their relative magnitudes</p> Signup and view all the answers

    What is the primary function of the 78XX series of voltage regulators?

    <p>To regulate the output voltage for a wide range of input voltages</p> Signup and view all the answers

    What is the typical dropout voltage for the 78XX series of voltage regulators?

    <p>2V</p> Signup and view all the answers

    What is the maximum current that the 7805 regulator can handle?

    <p>1A</p> Signup and view all the answers

    Why do linear regulators like the 78XX series require a heat sink in high current applications?

    <p>To dissipate excess voltage as heat</p> Signup and view all the answers

    What is the purpose of the 79XX series of voltage regulators?

    <p>To regulate the output voltage for negative voltage regulation</p> Signup and view all the answers

    What is the primary function of a Voltage Reference Generator in the LM723 voltage regulator?

    <p>To generate a stable reference voltage</p> Signup and view all the answers

    Which of the following is NOT a common application of the LM723 voltage regulator?

    <p>Audio Systems</p> Signup and view all the answers

    What is the purpose of the Error Amplifier in the LM723 voltage regulator?

    <p>To compare the reference voltage with the feedback voltage</p> Signup and view all the answers

    What is the function of the Series Pass Element (Power Transistor) in the LM723 voltage regulator?

    <p>To adjust the output voltage based on the error signal</p> Signup and view all the answers

    What is the purpose of the Current Limiting feature in the LM723 voltage regulator?

    <p>To protect the regulator and the load from excessive current</p> Signup and view all the answers

    What is the primary advantage of Switched Mode Power Supplies (SMPS) in automotive electronics?

    <p>Compact size and high efficiency</p> Signup and view all the answers

    In an astable multivibrator configuration, what is the primary function of the 555 timer IC?

    <p>Producing a continuous square wave output</p> Signup and view all the answers

    What is the primary application of the 555 timer IC in pulse width modulation (PWM)?

    <p>Motor control and dimming applications</p> Signup and view all the answers

    What is the function of the voltage divider in the 555 timer IC?

    <p>Providing a reference voltage for the internal comparator</p> Signup and view all the answers

    In which mode can the 555 timer IC be used as a frequency divider?

    <p>Toggle mode</p> Signup and view all the answers

    What is the primary function of the phase detector in the 565 IC?

    <p>To detect phase differences between input signals</p> Signup and view all the answers

    What determines the frequency of the Voltage-Controlled Oscillator (VCO) in the 565 IC?

    <p>External timing resistor and capacitor</p> Signup and view all the answers

    What is the purpose of the internal filter in the 565 IC?

    <p>To process the phase detector output</p> Signup and view all the answers

    What is the range over which the 565 PLL can maintain lock?

    <p>Lock range</p> Signup and view all the answers

    What is one application of the 565 PLL in communication systems?

    <p>Clock recovery</p> Signup and view all the answers

    What is the advantage of using a PLL in frequency synthesizers?

    <p>Generation of stable and accurate output frequencies</p> Signup and view all the answers

    In what type of application is the 565 PLL used for decoding audio tones?

    <p>Audio tone decoding</p> Signup and view all the answers

    What is the purpose of the 565 PLL in motor control circuits?

    <p>Speed control</p> Signup and view all the answers

    In what type of system is the 565 PLL used for data synchronization?

    <p>Communication systems</p> Signup and view all the answers

    What is a key feature of the 565 PLL that makes it versatile?

    <p>Its ability to lock onto and track a specific frequency or phase</p> Signup and view all the answers

    What components are responsible for smoothing the rectified DC voltage in a Switched Mode Power Supply (SMPS)?

    <p>Filter capacitor and output filter</p> Signup and view all the answers

    Why is Switched Mode Power Supply (SMPS) known for its high efficiency compared to linear power supplies?

    <p>By minimizing power dissipation in the active switching components</p> Signup and view all the answers

    In an SMPS, which component plays a crucial role in controlling the power flow by switching the DC voltage on and off at high frequency?

    <p>Switching transistor/MOSFET</p> Signup and view all the answers

    What role does the feedback circuit play in a Switched Mode Power Supply?

    <p>It adjusts the switching transistor's duty cycle to maintain a constant output</p> Signup and view all the answers

    Why can SMPS be more compact and lightweight compared to linear power supplies?

    <p>As a result of higher efficiency and reduced heat dissipation</p> Signup and view all the answers

    What is the primary function of a Pulse Width Modulation (PWM) generator?

    <p>To produce a PWM signal for applications like motor speed control and LED dimming</p> Signup and view all the answers

    In what mode does the 555 timer act as a flip-flop, maintaining one of two stable output states until triggered to switch to the other state?

    <p>Bistable</p> Signup and view all the answers

    What is the purpose of the low-pass filter in a Phase-Locked Loop (PLL) system?

    <p>To filter the output of the phase detector to remove high-frequency components</p> Signup and view all the answers

    What is the primary function of a Phase-Locked Loop (PLL) system?

    <p>To generate an output signal that is phase-locked to the input reference signal</p> Signup and view all the answers

    What is the function of the voltage-controlled oscillator (VCO) in a Phase-Locked Loop (PLL) system?

    <p>To generate an output signal whose frequency is directly proportional to the input voltage</p> Signup and view all the answers

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