Audio Power Amplifiers

Bridge Tied Load Amplifier

Bridge Tied Load Amplifier: All of the power amplifiers already discussed have been single-ended (SE): meaning that they provide power to a load that has one terminal grounded and the other terminal connected to the amplifier output. These amplifiers either use a plus-minus supply with directly-coupled loads, or have a capacitor-coupled load and a single-polarity …

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Audio Power Amplifier using IC Amplifier Driver

Audio Power Amplifier using IC Amplifier Driver: The LM391 integrated circuit Audio Power Amplifier using IC Amplifier Driver contains amplification and driver stages for controlling an externally-connected Class-AB output stage delivering 10 W to 100 W. The voltage gain and bandwidth are set by additional components. Internal circuitry is included for overload and thermal protection, …

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Complementary MOSFET Common Source Power Amplifier

Complementary MOSFET Common Source Power Amplifier: Advantages of MOSFETs: Complementary MOSFET Common Source Power Amplifier have several advantages over power BJTs for large signal amplifier applications. One of the most important differences is that MOSFET transfer characteristics (ID/VGS) are more linear than IC/VBE characteristics for BJTs. This helps to minimize distortion in the output waveform. …

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Power Supply Decoupling

Power Supply Decoupling: Power Supply Decoupling – High-power amplifiers require high supply current levels, so unregulated power supplies are often employed to avoid the power wasted in a series regulator. The high ripple voltage that occurs with unregulated supplies can be amplified to appear at speaker outputs as very unpleasant power supply hunt Supply decoupling …

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Output Current Limiting

Output Current Limiting: Because the output transistors can be destroyed by excessive current flow, output current limiting circuits are often included in a power amplifier. Figure 18-27 shows the typical arrangement for a current limiting circuit. Emitter resistors RE2 and RE3 are each made up of two components (RA and RB), as illustrated. The Output …

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Quasi Complementary Output Stage

Quasi Complementary Output Stage: The Quasi Complementary Output Stage was originally developed because complementary high-power transistors were not readily available. Despite the fact that such transistors are now available, the Quasi Complementary Output Stage circuit is still widely used. Consider the arrangement in Fig. 18-26. Q3 is a high-power npn transistor, and Q5 is a …

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