By EECTECH | 22 July 2020 | 0 Comments
Why do ceramic capacitors have bias characteristics? How does ceramic material affect the bias chara
The condition of the electric field in the material has an impact on the available capacity.
Without DC bias, the AC signal makes the "fixed" charge in the medium commutate back and forth, thereby affecting the electric field distribution in the material and "adsorbing" more charges. As the AC amplitude increases, the "charge" direction is more consistent with the electric field, the additional electric field strength increases, and the usable capacity increases; but when the fixed charge field strength in the medium is the same, the is small, so the AC capacity characteristics will be saturated.
In the same way, the DC bias causes the fixed charge in the medium to produce a fixed deflection, so the performance of the material will be degraded. The high-biased and strong electric field causes the medium to be oriented and polarized, and the material returns to the situation of ordinary ceramics.
Therefore, when designing a capacitor, it is necessary to consider many aspects from the material formula, to the appearance shape design, the electrode shape design, etc., to minimize the influence of the electric field environment on the capacitance!
Leave a Reply
Your email address will not be published.Required fields are marked. *