Conclusion
1. Parallel automatic gain control is required for the R and IR signals in dual-wavelength photometric pulse oxyhemometers.
2. Multiplying digital-to-analog converters are suitable executive elements for maintaining identical instantaneous values of the gain of the R and IR channels.
3. The optimal frequency of the clock generator of the AGC of pulse oxyhemometers is about 1/4 Hz.
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Literature cited
Ya. Z. Tsypkin, Principles of the Theory of Automatic Systems [in Russian], Moscow (1977).
V. L. Shilo, Functional Integral Microcircuits [in Russian], Moscow (1982).
Additional information
Scientific Industrial Association (NPO) “Krasnogvardeets”, Leningrad. Translated from Meditsinskaya Tekhnika, No. 1, pp. 22–23, January–February, 1992.
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Leonov, G.N., Filippovskii, V.V., Karpov, A.V. et al. A system for automatic gain control of pulse oxyhemometer channels. Biomed Eng 26, 25–27 (1992). https://doi.org/10.1007/BF00562635
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DOI: https://doi.org/10.1007/BF00562635