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General Description of the Amplifier
The circuit corresponds to a class AB audio power amplifier, fully discrete, designed with emphasis on high open loop gain, low noise, and good power supply immunity. It uses an input differential pair with dynamic loads implemented by current mirrors, a voltage amplification stage with active load, and drivers powered from actively regulated intermediate supply nodes, decoupled from the main rails. The output stage is a complementary emitter follower with global feedback.
Advantages of the Design
• High open loop gain
• Excellent CMRR and PSRR
• Low harmonic and intermodulation distortion
• Good dynamic behavior and high slew rate
• Driver stage isolated from main power rails
• Stable operation with real loudspeaker loads
This amplifier is clearly oriented toward high fidelity audio, prioritizing linearity, stage isolation, and controlled dynamic behavior. In exchange, it demands careful component selection, PCB layout, and thermal design, making it better suited for demanding audio projects than for low cost or mass production implementations.
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