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US 6,486,752 B1Granted
Surface acoustic wave filter pattern with grounding via connection lines to dicing lines
AssigneeOki Electric Industry Co., Ltd.
InventorKazushige Noguchi
Life of this patent
Estimating the term…
Abstract
In a surface acoustic wave filter having tooth comb-type cross electrodes provided over a plurality of levels, connection patterns to connect and ground all the patterns on a chip via dicing lines are provided with at least one of the connection patterns provided between reflectors. Thus, all the electrode patterns are grounded even in a surface acoustic wave filter with the tooth comb-type cross electrodes provided over a plurality of levels, and, as a result, electrostatic breakdown due to discharge can be prevented.
Claims20
A surface acoustic wave filter pattern achieved by connecting surface acoustic wave resonators, each having tooth comb-type cross electrodes provided over a plurality of levels and reflectors, in a ladder pattern,
- each said resonator including an inter-digital transducer with a common center electrode having first and second groups of comb-like teeth extending in opposite directions along a surface of a chip, first and second comb-type electrodes on said surface whose comb teeth extend respectively between the teeth of the first and second groups of teeth, and a pair of conductive reflector patterns disposed on said surface at each end of said transducer adjacent the respective first and second comb-type electrodes;
- connection patterns connecting and grounding all conductive patterns on the surface of the chip via dicing lines, on said chip surface, with each common electrode being connected to a dicing line via a respective connection line extending between two reflector patterns of a said pair of reflector patterns for the respective resonator;
- a series connected resonator of the ladder pattern has one of its first and second electrodes connected to an input signal terminal or an output signal terminal, and the other of its first and second electrodes connected to one of said first and second electrodes of a parallel connected resonator;
- and,
- a parallel connected resonator of the ladder pattern has one of its first and second electrodes connected to one of the first and second electrodes of a series connected resonator and the other of its first and second electrodes connected to ground.
2 more elements
A surface acoustic wave filter pattern, comprising:
- an input signal terminal;
- a first series arm surface acoustic wave resonator having first and second groups of comb-like teeth and a common electrode, with the common electrode being disposed between the first group of comb-like teeth and the second group of comb-like teeth, and with the first group of comb-like teeth connected to the input signal terminal;
- a second series-arm surface acoustic wave resonator connected to the second group of comb-like teeth;
- two reflector patterns respectively disposed next to the first and second groups of comb-like teeth;
- a connection pattern connected to the common electrode and extending between the two reflector patterns;
- a parallel arm surface acoustic wave resonator having first and second electrodes, with the first electrode being connected to the input signal terminal and the first group of comb-like teeth, and with the second electrode disposed opposite the first electrode;
- a dicing line formed around the first and second series arm surface acoustic resonators and the first parallel arm surface acoustic wave resonator;
- a conductive pattern formed on the dicing line;
- and
- wherein the common electrode is connected with the two reflector patterns, the first and second groups of comb-like teeth and the second electrode of the first parallel arm surface acoustic wave resonator through the connection pattern and the conductive pattern on the dicing line.
7 more elements
A suface acoustic wave filter pattern, comprising:
- an output signal terminal;
- a first series arm surface acoustic wave resonator having first and second groups of comb-like teeth and a common electrode, with the common electrode being disposed between the first group of comb-like teeth and the second group of comb-like teeth, and with the first group of comb-like teeth being connected to the output signal terminal;
- a second series-arm surface acoustic wave resonator connected to the second group of comb-like teeth;
- two reflector patterns respectively disposed next to the first and second groups of comb-like teeth;
- a connection pattern connected to the common electrode and extending between the two reflector patterns;
- a parallel are surface acoustic wave resonator having first and second electrodes, with the first electrode connected to the output signal terminal and the first group of comb-like teeth, and with the second electrode disposed opposite the first electrode;
- a dicing line formed around the first and second series arm surface acoustic wave resonators and the first parallel arm surface acoustic wave resonator;
- a conductive pattern being formed on the dicing line;
- and
- wherein the common electrode is connected with the two reflector patterns, the first and second groups of comb-like teeth and the second electrode of the first parallel arm surface acoustic wave resonator through the connection pattern and the conductive pattern on the dicing line.
7 more elements
A surface acoustic wave filter pattern, comprising:
- an input signal terminal;
- a first parallel arm surface acoustic wave resonator having first and second groups of comb-like teeth and a common electrode, with the common electrode being disposed between the first group of comb-like teeth and the second group of comb-like teeth, and with the first group of comb-like teeth connected to the input signal terminal;
- two reflector patterns respectively disposed next to the first and second groups of comb-like teeth;
- a connection pattern connected to the common electrode and extending between the two reflector patterns;
- a first series arm surface acoustic wave resonator having first and second electrodes, with the first electrode connected to the input signal terminal and the first group of comb-like teeth, and with the second electrode disposed opposite the first electrode;
- a second series-arm surface acoustic wave resonator connected to the second electrode of the first series arm surface acoustic wave resonator;
- a dicing line formed around the first and second series arm surface acoustic wave resonators and the first parallel arm surface acoustic wave resonator;
- a conductive pattern formed on the dicing line;
- and
- wherein the common electrode is connected with the two reflector patterns, the first and second groups of comb-like teeth and the second electrode of the first series arm surface acoustic wave resonator through the connection pattern and the conductive pattern on the dicing line.
7 more elements
A surface acoustic wave filter pattern, comprising:
- an output signal terminal;
- a parallel arm surface acoustic wave resonator having first and second groups of comb-like teeth and a common electrode, with the common electrode being disposed between the first group of comb-like teeth and the second group of comb-like teeth, and with the first group of comb-like teeth being connected to the output signal terminal;
- two reflector patterns being respectively disposed next to the first and second groups of comb-like teeth;
- a connection pattern connected to the common electrode and extending between the two reflector patterns;
- a first series arm surface acoustic wave resonator having first and second electrodes, with the first electrode connected to the output signal terminal and the first group of comb-like teeth, and with the second electrode disposed opposite the first electrode;
- a second series-arm surface acoustic wave resonator connected to the second electrode of the first series arm surface acoustic wave resonator;
- a dicing line formed around the first and second series arm surface acoustic wave resonator and the parallel arm surface acoustic wave resonator;
- a conductive pattern formed on the dicing line;
- and
- wherein the common electrode is connected with the two reflector patterns;
- the first and second groups of comb-like teeth and the second electrode of the first series arm surface acoustic wave resonator through the connection pattern and the conductive pattern on the dicing line.
8 more elements
Dependencies are inferred from the claim text.