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Multiplying circuits with semiconductor diodes

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Measurement Techniques Aims and scope

Conclusions

The characteristics of semiconductor diodes type D9E and other types have a steeper slope than the approximated parabola. It is, therefore, possible by connecting a building-out resistor in series with the diode to make up a two-terminal network whose characteristic has three common points with approximated parabola. The error of approximation then does not exceed 2%.

In order to preserve the square-law characteristic of the two-terminal “resistance-diode” network despite changing temperature it is necessary to connect a thermistor in series with the diode. Thermistors type MMT are suitable for use with diodes type D9E.

Temperature changes produce variations in the characteristics of diodes and thermistors which form part of the circuit, thus leading to errors. The compensation of these errors can be attained by means of thermistors types MMT and KMT.

Tests have shown that the referred error of thermally-compensated diode multiplying circuits does not exceed 2–3% in the temperature range of 20±10 ‡C.

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Literature cited

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Authors
  1. K. B. Karandeev
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  2. F. B. Grinevich
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Karandeev, K.B., Grinevich, F.B. Multiplying circuits with semiconductor diodes. Meas Tech 7, 991–996 (1964). https://doi.org/10.1007/BF00980730

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  • DOI: https://doi.org/10.1007/BF00980730

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