Electronics Engineering (ELEX) Board Practice Exam

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What type of feedback is indicated by a voltage series feedback connection?

  1. Voltage shunt feedback

  2. Current series feedback

  3. Voltage series feedback

  4. Current shunt feedback

The correct answer is: Voltage series feedback

Voltage series feedback occurs when a portion of the output voltage is fed back to the input in a manner that is directly proportional to the output voltage. This form of feedback is essential for improving the linearity and stability of amplifiers, as it helps in reducing distortion and increasing bandwidth. By connecting the feedback voltage in series with the input, the overall gain can be controlled more effectively, allowing for greater accuracy and predictability in the amplifier's output response. In the context of amplifiers, voltage series feedback is characterized by its impact on both the input and output impedance. It tends to increase the input impedance while decreasing the output impedance, which is advantageous for many applications where such characteristics are desirable. This feedback configuration is widely used in operational amplifiers and other analog circuits to enhance performance. Understanding the concept of voltage series feedback is critical for electronics engineers, as it forms the foundation for designing stable and efficient circuits that meet required specifications.

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