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Optimization of the Amplified-Diode Bias Circuit for Audio Amplifiers
An economic enhancement to the conventional "amplified diode" bias circuit is presented for use in power amplifier circuit topologies which do not allow precise, temperature invariant control of the operating current of the bias circuit. In essence, the modification minimizes the sensitivity of the derived bias voltage to changes in operating current without compromising the desirable temperature tracking properties when thermally bonded to the complementary follower output cell.
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