Abstract
In this article, a D/A converter employing a novel generalised technique that achieves wide-output linear-in-dB dynamic ranges is proposed. The feasibility of the approach is demonstrated by constructing a linear-in-90 dB exponential amplifier. In addition, a pseudo-exponential circuit employing two operational amplifiers and a few resistors that simulate the exponential function over a predefined range of 15 dB is proposed as a building block. The theoretical results were experimentally confirmed using readily available components in a circuit with a static power consumption of 22 mW when powered with a ±2.75 V supply.
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