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access icon free Temperature-stable heat pulse driver circuit for low-voltage single supply soil moisture sensors based on junction transistors

A temperature-stable heat pulse driver for low-voltage single supply soil moisture sensors based on junction transistors is presented. The temperature drift of the heat pulse, caused by the variations dV BE/dT in the transistors placed in the feedback loop, is fully compensated for. A circuit measures the variations dV BE/dT of the transistors in the feedback loop and generates a current which is proportional to the − (1/R0) dV BE/dT that, when passed through another resistor inside the feedback loop (R 1 = R 0), provides full temperature compensation. The topology of the circuit also provides an output voltage (the voltage used to define the heat pulse) which does not need to be calibrated, since it depends only on a reference voltage external to the feedback loop.

References

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      • 6. Meijer, G.: ‘Integrated circuits and components for bandgap references and temperature transducers’. Ph.D. dissertation, Delft University of Technology, Delft, The Netherlands, 1982.
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      • 2. Dias, P.C., Roque, W., Ferreira, E., Siqueira Dias, J.: ‘Proposal of a novel heat dissipation soil moisture sensor’. Proc. of 5th WSEAS Int. Conf. on Circuits, Systems and Signals, Puerto Morelos, Mexico, January 2011, pp. 124127.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2015.3329
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content/journals/10.1049/el.2015.3329
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