Abstract
The theory, fabrication, and performance of new gallium antimonide tunnel diode transducers are described. The outstanding features of these devices are simplicity, very small size (< 1 mm), good resolution (∼0.3 mm Hg for a 1000 Hz bandwidth) and wide dynamic range (∼60 db). The temperature sensitivity is generally, but not inherently, high (equivalent to ∼25 mmHg/°C) but is readily reduced by conventional compensation techniques to the equivalent of about 1mm Hg/°C or better. The present design is particularly attractive for biomedical applications for which special configurations and circuitry have been developed. In addition, an experimental tunnel diode accelerometer of miniature size and mass is described. Taking advantage of the tunnel diode switching characteristic, experimental circuitry has been designed to yield pulse-width and frequency-modulated output with high percentage (∼0.5 per cent/mm Hg) deviation.
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