| 摘要 |
<p>A current regulating, transconductance amplifier (22) is connected to the load capacitor (EC1) of a backplane system. The load capacitor (EC1) is connected close to the load inside the feedback loop of the regulating amplifier (22). The frequency response shaping networks of the amplifier (22) are designed to include the pole and zero, contributed by this capacitor (EC1) to meet the criteria for fast settling of a current step at the load. At least in the location of the load capacitor (EC1) and the current feedback paths between each sense point and the transconductance amplifier (22) of the regulator the dielectric thickness of the dielectric material is made as thin as possible, consistent with manufacturability and voltage breakdown (currently on the order of seven mils thick), and the current paths between the transconductance amplifier (22) and each of the sense points (for detecting changes in load current) are made parallel to one another on opposite sides of the dielectric material so that the current in the two paths follow equal and opposite parallel directions. This results in the interaction of the electromagnetic fields created by the two currents drawn at the sense points so that they cancel one another so as to reduce the parasitic impedance of these current paths.</p> |
