Frequency Response and Application - Low Power Amplifiers - Applied Electronics | Summary and Q&A

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January 12, 2020
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Frequency Response and Application - Low Power Amplifiers - Applied Electronics

TL;DR

Learn about the frequency response of transformer-coupled amplifiers and their advantages, disadvantages, and applications.

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Key Insights

  • 😘 Transformer-coupled amplifiers exhibit a frequency response divided into low, mid, and high-frequency regions.
  • ⚡ Inductive reactance and distributed capacitance contribute to the decrease in voltage gain at low and high frequencies, respectively.
  • ⚡ Transformer coupling offers advantages such as no signal loss, higher voltage gain, and excellent impedance matching.
  • 🧑‍🤝‍🧑 However, disadvantages include the bulky and expensive nature of coupling transformers, distortions at radio frequencies, and the production of circuit noise.

Transcript

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Questions & Answers

Q: Why does the voltage gain decrease at low frequencies in transformer-coupled amplifiers?

The voltage gain decreases at low frequencies because the output voltage is taken across the primary winding, which has less voltage drop due to lower inductive reactance at lower frequencies.

Q: What causes the decrease in voltage gain at high frequencies in transformer-coupled amplifiers?

The decrease in voltage gain at high frequencies is primarily due to leakage inductance and distributed capacitance, which result in the roll-off of voltage gain.

Q: How does transformer coupling provide impedance matching between successive stages?

Transformer coupling in amplifiers ensures impedance matching by matching the impedance of the output stage with the input stage, leading to efficient power transfer and minimizing signal reflections.

Q: What are the applications of transformer coupling?

Transformer coupling is commonly used for impedance matching, power amplification, and in applications where maximum power transfer is required.

Summary & Key Takeaways

  • Transformer-coupled amplifiers have a frequency response divided into low, mid, and high-frequency regions, with the maximum voltage gain at a specific frequency.

  • The decrease in voltage gain at low frequencies is due to the lower inductive reactance, while at high frequencies, it's caused by leakage inductance and distributed capacitance.

  • Advantages of transformer-coupled amplifiers include no signal loss in the collector resistor, higher voltage gain compared to RC-coupled amplifiers, and excellent impedance matching. Disadvantages include bulky and expensive coupling transformers, distortions at radio frequencies, and circuit noise.

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