BANDPASS FILTER IMPLEMENTATION ON A SINGLE LAYER USING SPIRAL CAPACITORS

摘要

A planar capacitor includes, in part, a first metal line forming spiral-shaped loops around one of its end point, and a second metal line forming spiral-shaped loops between the loops of the first metal line. The first and second metal lines are coplanar, formed on an insulating layer, and form the first and second plates of the planar capacitor. The planar capacitor may be used to form a filter. Such a filter includes a first metal line forming first spiral-shaped loops, a second metal line forming second spiral-shaped loops, and a third metal line—coplanar with the first and second metal lines—forming loops between the loops of the first and second metal lines. The filter further includes a first inductor coupled between the first and third metal lines, and a second inductor coupled between the second and third metal lines.

主权项

1. A planar capacitor comprising:
a first metal line formed on an insulating layer and including a first end, said first metal line forming spiral-shaped loops around the first end of the first metal line, said first metal line forming a first plate of the planar capacitor; and a second metal line formed on the insulating layer, said second metal line forming spiral-shaped loops around a first end of the second metal line, the loops of the second metal line being formed between the loops of the first metal line, said second metal line forming a second plate of the planar capacitor.