Bandpass filter implementation on a single layer using spiral capacitors
First Claim
1. A filter comprising:
- a first metal line formed on an insulating layer, said first metal line forming spiral-shaped loops around a first end of the first metal line, said first metal line comprising a first metal plate forming an input terminal of the filter;
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, said second metal line comprising a second metal plate forming an output terminal of the filter;
a third metal line formed on the insulating layer, said third metal line forming first spiral-shaped loops between the loops of the first metal line and said third metal line forming second spiral-shaped loops between the loops of the second metal line, said third metal line comprising a third metal plate forming a ground terminal;
a first inductor coupled between the first and third metal lines; and
a second inductor coupled between the second and third metal lines, wherein said first, second and third metal plates have a same width.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
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Citations
36 Claims
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1. A filter comprising:
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a first metal line formed on an insulating layer, said first metal line forming spiral-shaped loops around a first end of the first metal line, said first metal line comprising a first metal plate forming an input terminal of the filter; 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, said second metal line comprising a second metal plate forming an output terminal of the filter; a third metal line formed on the insulating layer, said third metal line forming first spiral-shaped loops between the loops of the first metal line and said third metal line forming second spiral-shaped loops between the loops of the second metal line, said third metal line comprising a third metal plate forming a ground terminal; a first inductor coupled between the first and third metal lines; and a second inductor coupled between the second and third metal lines, wherein said first, second and third metal plates have a same width. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A non-transitory computer readable storage medium comprising instructions that when executed by a processor cause the processor to:
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form a first metal line on an insulating layer, said first metal line forming spiral-shaped loops around a first end thereof, said first metal line comprising a first metal plate forming an input terminal of a filter; form a second metal line on the insulating layer, said second metal line forming spiral-shaped loops around a first end thereof, said second metal line comprising a second metal plate forming an output terminal of the filter; form a third metal line on the insulating layer, said third metal line forming first spiral-shaped loops between the loops of the first metal line and said third metal line forming second spiral-shaped loops between the loops of the second metal line, said third metal line comprising a third metal plate forming a ground terminal; form a first inductor between the first and third metal lines; and form a second inductor between the second and third metal lines, thereby to form the filter, wherein said first, second and third metal plates have a same width. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of forming a filter, the method comprising:
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forming a first metal line on an insulating layer, said first metal line forming spiral-shaped loops around a first end thereof, said first metal line comprising a first metal plate forming an input terminal of the filter; forming a second metal line on the insulating layer, said second metal line forming spiral-shaped loops around a first end thereof, said second metal line comprising a second metal plate forming an output terminal of the filter; forming a third metal line on the insulating layer, said third metal line forming first spiral-shaped loops between the loops of the first metal line and said third metal line forming second spiral-shaped loops between the loops of the second metal line, said third metal line comprising a third metal plate forming a ground terminal; forming a first inductor between the first and third metal lines; and forming a second inductor between the second and third metal lines, wherein said first, second and third metal plates have a same width. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. An apparatus comprising:
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means for forming a first metal line on an insulating layer, said first metal line forming spiral-shaped loops around a first end thereof, said first metal line comprising a first metal plate forming an input terminal of a filter; means for forming a second metal line on the insulating layer, said second metal line forming spiral-shaped loops around a first end thereof, said second metal line comprising a second metal plate forming an output terminal of the filter; means for forming a third metal line on the insulating layer, said third metal line forming first spiral-shaped loops between the loops of the first metal line and said third metal line forming second spiral-shaped loops between the loops of the second metal line, said third metal line comprising a third metal plate forming a ground terminal; means for forming a first inductor between the first and third metal lines; and means for forming a second inductor between the second and third metal lines, wherein said first, second and third metal plates have a same width. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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Specification