The electrical characteristics of glass microelectrodes with different tip diameters were investigated using a servo analyzer with the aid of a capacitance neutralization circuit. The input and distributed capacitances occurring at microelectrode-measurement interface was reduced with a specially designed capacitance neutralization circuit. Using least-square-error approximation, we found the equivalent circuit of a glass microelectrode was composed of a resistor and a capacitor in parallel. The capacitor was negligible when the tip diameter was large than 2 μm. An exponentially decreasing relationship was found between the tip diameter and the impedance of the microelectrodes.
|Number of pages||8|
|Journal||Biomedical Engineering - Applications, Basis and Communications|
|Publication status||Published - 1993 Jan 1|
All Science Journal Classification (ASJC) codes
- Biomedical Engineering