Integrated filter balun
First Claim
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1. A component comprising:
- a) a filter that includes a single ended input and a single ended output;
b) a balanced to unbalanced circuit (balun) that includes a single ended port directly coupled to the single ended output of the filter and a differential port;
wherein the balun is integrated with the filter.
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Abstract
A component that includes a first structure that is integrated with a second structure. The first structure is a lumped balanced to unbalanced circuit (balun) and the second structure is a resonator-based filter. The function of the balun is to move a signal from a differential form to a single ended form or from a single ended form to a differential form. The component has an area that is comparable to the area needed to implement the balun alone. However, the component now provides a filter function. Preferably, the substrate of the first structure also acts as a substrate for the second structure.
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Citations
17 Claims
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1. A component comprising:
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a) a filter that includes a single ended input and a single ended output;
b) a balanced to unbalanced circuit (balun) that includes a single ended port directly coupled to the single ended output of the filter and a differential port;
wherein the balun is integrated with the filter. - View Dependent Claims (2, 3, 4)
wherein the filter is in the first stage;
wherein the single ended input of the filter is coupled to the single ended input of the component;
wherein the balun is in the second stage;
wherein the single ended port of the balun is coupled to the singled ended output of the filter; and
wherein the differential port of the balun is coupled to the differential output of the component.
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3. The component of claim 1 further comprising a differential input, a single ended output, a first stage, and a second stage coupled to the first stage;
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wherein the balun is in the first stage;
wherein the differential port of the balun is coupled to the differential input of the component;
wherein the filter is in the second stage;
wherein the single ended input of the filter is coupled to the single ended port of the balun; and
wherein the single ended output of the filter is coupled to the single ended output of the component.
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4. The component of claim 1 wherein the filter is one of a resonator-based filter, a filter that is implemented film bulk acoustic resonators (FBARs), and a filter that is implemented with surface acoustic wave (SAW) technology;
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wherein the balun is implemented with one of at least two transmission lines and lumped elements that include inductors and capacitors.
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5. A component comprising:
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a) a filter that includes a differential input and a differential output;
b) a balanced to unbalanced circuit (balun) that includes a single ended port and a differential port;
wherein the balun is integrated with the filter. - View Dependent Claims (6, 7, 8)
wherein the balun is in the first stage;
wherein the single ended port of the balun is coupled to the singled ended input of the component;
wherein the filter is in the second stage;
wherein the differential input of the filter is coupled to the differential port of the balun; and
wherein the differential output of the filter is coupled to the differential output of the component.
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7. The component of claim 5 further comprising a differential input, a single ended output, a first stage, and a second stage coupled to the first stage;
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wherein the filter is in the first stage;
wherein the differential input of the filter is coupled to the differential input of the component;
wherein the balun is in the second stage;
wherein the differential port of the balun is coupled to the differential output of the filter; and
wherein the single ended port of the balun is coupled to the single ended output of the component.
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8. The component of claim 5 wherein the filter is one of a resonator-based filter, a filter that is implemented film bulk acoustic resonators (FBARs), and a filter that is implemented with surface acoustic wave (SAW) technology;
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wherein the balun is implemented with one of at least two transmission lines and lumped elements that include inductors and capacitors.
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9. A component comprising:
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a) a first terminal for receiving a single-ended input;
b) a second terminal and a third terminal for providing a differential output;
c) a first structure that includes a first electrode coupled to the first terminal and a second electrode; and
d) a second structure that includes a first electrode coupled to the second electrode of the first structure and a second electrode that is coupled to the second terminal and a third electrode that is coupled to the third terminal;
wherein the second structure is integrated with the first structure;
wherein the first structure is a balanced to unbalanced circuit (balun) and the second structure is a filter.- View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
wherein the first structure acts as a substrate for the second structure, and the second structure is one of bonded to the first structure and flip-mounted on the first structure.
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Specification