Negative capacitance amplifier for microelectrode investigations

Véró, Mihály (1971) Negative capacitance amplifier for microelectrode investigations. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 38. pp. 107-115. ISSN 0365-3005

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Abstract

A solid state amplifier and different measurement set-ups for microelectrode method are investigated by the author. The preamplifier is supplied with a compensating circuit for neutralization of the input shunt capacity, and has unity gain and high input resistance. The different measurement tasks are handled by a bridge which can be connected to the input. In this way, the object under test may be polarized by DC current or stimulated by a square wave. The measurement bridge also serves for measuring the microelectrode resistance. The visual evaluation of the signals is possible by an oscilloscope connected to the output of the low-level preamplifier. The system has also a high-level output for driving signal storage and signal processing devices. The control methods of the measurement set-up parameters are summarized in a Table. The parameters have been controlled by a calibrating circuit which has been also dealt with.

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