A Non Standard Op-Amp Based Mic Preamp Design Meets Studio Quality Noise Requirements
Contemporary transformerless mic preamp design frequently utilizes a state-of-the-art monolithic op-amp supplemented with the descrete input stage. This approach does provide an answer to op-amp's inherent noise problems, but it also violates some of its indispensible properties which opens a number of problems of different nature. The non-standard approach proposed in this paper however, copes with this problem by taking advantage of summation of the uncorrelated noise of n parallel conventional co-amps. This yields a substantial noise reduction, still retaining all of the op-amp's key features intact. Another advantage of this approach is statistical matching of some op-amp's properties thus making selecting obsolete, which can also be suitable for a higher volume production. The paper includes theoretical background with evaluation of some practical implications.
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