A low-distortion output stage with improved stability for monolithic power amplifiers
作者： E. Seevinck , W. De Jager , P. Buitendijk
DOI: 10.1109/4.320
关键词: Biasing 、 Feed forward 、 Operational amplifier 、 Phase margin 、 Total harmonic distortion 、 Linearity 、 Control theory 、 Engineering 、 Amplifier 、 Crossover distortion
摘要: A low-distortion class AB output stage with improved stability suitable for monolithic power amplifiers (P/sub 0/>or=40 W) is described. The concept has been verified on a 12-W breadboard version as well partly integrated prototype, and supported by computer simulations P/sub W biasing control law which guarantees predictable conduction of both transistors at all times implemented. This reduces crossover distortion allows the customary quasi-p-n-p compound transistor to be eliminated, thus also improving stability. Linearity use local negative feedback. Phase margin application high-frequency feedforward. Measured phase around 60 degrees total harmonic load 7 Omega about -80 dB 20 kHz. >
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