Transistor Amplifiers
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Questions and Answers

What does the current gain of a transistor amplifier measure?

  • The ratio of output power to input power
  • The ratio of output current to input current (correct)
  • The ratio of output voltage to input voltage
  • The ratio of output impedance to input impedance
  • What is the main advantage of a Class A power amplifier?

  • High current gain
  • High power output
  • Low power conversion efficiency
  • High power conversion efficiency (correct)
  • What affects the frequency response of a transistor amplifier?

  • Only the cutoff frequency of the transistor
  • The cutoff frequency of the transistor, the load impedance, and the parasitic capacitances and inductances (correct)
  • Only the load impedance
  • Only the input signal frequency
  • What is the common emitter configuration commonly used for?

    <p>Providing a high current gain and a moderate voltage gain</p> Signup and view all the answers

    What is the frequency region where the gain of the amplifier is significantly reduced?

    <p>High-frequency region</p> Signup and view all the answers

    What is the common characteristic of a common collector configuration?

    <p>High current gain and low voltage gain</p> Signup and view all the answers

    What is the unit of measurement for gain?

    <p>Decibels (dB)</p> Signup and view all the answers

    What type of gain is measured as the ratio of output voltage to input voltage?

    <p>Voltage Gain</p> Signup and view all the answers

    In the formula Gain (dB) = 20 * log10 (Vout / Vin), what does Vin represent?

    <p>Input voltage</p> Signup and view all the answers

    What type of amplifier is used in audio equipment to increase the volume of audio signals?

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

    Which type of amplifier is used in medical and industrial equipment to amplify low-level signals?

    <p>Instrumentation Amplifier</p> Signup and view all the answers

    What is a common application of Power Amplifiers?

    <p>Power supplies</p> Signup and view all the answers

    Study Notes

    Current Gain

    • The current gain of a transistor amplifier is defined as the ratio of output current to input current
    • It is typically denoted by the symbol β (beta) and is a dimensionless quantity
    • β is a measure of how much the transistor amplifies the input current
    • A higher β indicates a higher current gain, which means a smaller input current is required to produce a certain output current
    • Typical values of β for bipolar junction transistors (BJTs) range from 10 to 500

    Power Amplification

    • Power amplification refers to the ability of a transistor amplifier to increase the power of the input signal
    • The power gain of an amplifier is defined as the ratio of output power to input power
    • Power amplification is achieved by using a high-power transistor and a suitable load impedance
    • There are several classes of power amplifiers, including:
      • Class A: High power conversion efficiency, but low power output
      • Class B: High power output, but low power conversion efficiency
      • Class AB: A compromise between Class A and Class B

    Frequency Response

    • The frequency response of a transistor amplifier refers to its ability to amplify signals of different frequencies
    • The frequency response is typically measured by plotting the gain of the amplifier against frequency
    • There are several factors that affect the frequency response of a transistor amplifier, including:
      • The cutoff frequency of the transistor
      • The load impedance
      • The parasitic capacitances and inductances of the amplifier
    • The frequency response of an amplifier can be classified into three regions:
      • Low-frequency region: The gain is relatively constant
      • Mid-frequency region: The gain decreases with increasing frequency
      • High-frequency region: The gain is significantly reduced

    Amplifier Configurations

    • There are several common amplifier configurations, including:
      • Common emitter (CE) configuration: The most common configuration, which provides a high current gain and a moderate voltage gain
      • Common collector (CC) configuration: Also known as an emitter follower, which provides a high current gain and a low voltage gain
      • Common base (CB) configuration: Provides a high voltage gain and a low current gain
    • Each configuration has its own advantages and disadvantages, and the choice of configuration depends on the specific application

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    Test your knowledge of transistor amplifiers, including current gain, power amplification, frequency response, and amplifier configurations.

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