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Logarithmic IF amplifiers that implement both true and successive-detection designs are reported. Monolithically cascaded log gain stages are used to achieve piecewise-approximated logarithmic functions for the compression of signals over a wide dynamic range. The heterojunction bipolar transistor (HBT) IC fabrication process is based on a 3- mu m-emitter, self-aligned-base ohmic metal transistor using both molecular-beam epitaxy (MBE) and metal-organic metal vapor deposition (MOCVD) growth structures. The true log amp integrates four dual-gain (limiting and unity gain) stages without on-chip video detection. Its performance includes DC-3-GHz IF/video bandwidth, 400-ps rise time,>
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Oki et al. (1988) studied this question.
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