Audio Power Amplifiers

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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Common Source Amplifier Using an Op Amp Driver Stage

Common Source Power Amplifier Using an Op Amp Driver Stage: Basic Circuit Operation – The Class-AB MOSFET Power Amplifier with OP Amp Driver Stage circuit in Fig. 18-45(a) consists of an operational amplifier (A1), two MOSFETs (Q3 and Q4), and several resistors. The op-amp together with resistors R4, R5, and R6 and capacitor C2 constitutes …

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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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BJT Power Amplifier with Differential Input Stages

BJT Power Amplifier with Differential Input Stages: Amplifier Circuit – The direct-coupled amplifier in Fig. 18-33 has a BJT Power Amplifier with Differential Input Stages constituted by transistors Q1 and Q2. It also has an intermediate stage (Q3) with a constant current load (Q4). Both pairs of output stage transistors (Q5 and Q7) and (Q6 …

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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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