Patent US1824903A successfully refreshed from Google Patents.
US7199684B2
Expired / Lapsed
US
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Filter circuit with a filter stage and balun on a single substrate
Assignee: Avago Technologies International Sales Pte Ltd
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Filing: 2005-01-28
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Granted: 2007-04-03
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Expires: 2025-01-28
Abstract
Abstract A filter circuit comprises a balanced port, an unbalanced port and a substrate. A series circuit of a filter stage and a balun is disposed between the balanced port and the unbalanced port. The balun and the filter stage are formed on the substrate.
Inventors
- 👤 Robert Aigner
- 👤 Juha Sakari Ellae
- 👤 Stephan Marksteiner
- 👤 Hans-Jörg Timme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:50
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/0023; H03H9/0095; H03H9/46; H03H9/54; H03H9/58; H01; H01F; H01F17/00; H01F17/0006; H01F21/00; H01F21/12; H01F2021/125; H03H7/00; H03H7/42
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
95 words
A filter circuit, comprising: a balanced port; an unbalanced port; a substrate; and a series circuit comprising a filter stage and a balun, disposed between the balanced port and the unbalanced port, wherein the filter stage is a balanced filter stage connected to the balanced port and wherein the series circuit further comprises an unbalanced filter stage connected to the unbalanced port, wherein the balun is connected between the balanced filter stage and the unbalanced filter stage and wherein the balanced filter stage, the unbalanced filter stage, and the balun are formed on the substrate.
Claim 2
Dependent Claim
95 words
A filter circuit, comprising: a balanced port; an unbalanced port; a substrate; and a series circuit comprising a filter stage and a balun, disposed between the balanced port and the unbalanced port, wherein the filter stage is a balanced filter stage connected to the balanced port and wherein the series circuit further comprises an unbalanced filter stage connected to the unbalanced port, wherein the balun is connected between the balanced filter stage and the unbalanced filter stage and wherein the balanced filter stage, the unbalanced filter stage, and the balun are formed on the substrate.
Claim 3
Dependent Claim
30 words
The filter circuit according to claim 1 , wherein at least one of the filter stages comprises at least one series BAW resonator and at least one parallel BAW resonator.
Claim 4
Dependent Claim
51 words
The filter circuit according to claim 1 , wherein the series circuit further comprises at least one adaption element connected between the unbalanced filter stage and the unbalanced port or between the balanced filter stage and the balanced port, wherein the at least one adaption element is formed on the substrate.
Claim 5
Dependent Claim
26 words
The filter circuit according to claim 1 , wherein the balun is a transformer element with two coils, wherein the coils are formed on the substrate.
Claim 6
Dependent Claim
28 words
The filter circuit according to claim 4 , wherein the coils have a winding ratio to effect an impedance transformation between the unbalanced port and the balanced port.
Claim 7
Dependent Claim
27 words
The filter circuit according to claim 4 , wherein the substrate has a high resistance and wherein the coils are formed on the substrate by metal traces.
Claim 8
Dependent Claim
26 words
The filter circuit according to claim 6 , wherein the metal traces of the coils are formed with a thickness between 800 nm and 1 μm.
Claim 9
Dependent Claim
46 words
The filter circuit according to claim 4 , wherein at least one of the filter stages comprises at least one BAW resonator, and wherein the substrate has an acoustic reflector and the at least one BAW resonator and the coils are formed above the acoustic reflector.
Claim 10
Dependent Claim
18 words
The filter circuit according to claim 1 , wherein the substrate comprises at least part of a chip.
Claim 11
Dependent Claim
85 words
A filter circuit, comprising: a balanced port; an unbalanced port; a substrate; and a series circuit comprising a filter stage and a balun, the series circuit disposed between the balanced port and the unbalanced port, wherein the balun and the filter stage are formed on the substrate. wherein the balun is a transformer element with two coils, wherein the coils are formed on the substrate, and wherein the substrate has a high resistance and wherein the coils are formed on the substrate by metal traces.
Claim 12
Dependent Claim
85 words
A filter circuit, comprising: a balanced port; an unbalanced port; a substrate; and a series circuit comprising a filter stage and a balun, the series circuit disposed between the balanced port and the unbalanced port, wherein the balun and the filter stage are formed on the substrate. wherein the balun is a transformer element with two coils, wherein the coils are formed on the substrate, and wherein the substrate has a high resistance and wherein the coils are formed on the substrate by metal traces.
Claim 13
Dependent Claim
28 words
The filter circuit according to claim 10 , wherein the coils have a winding ratio to effect an impedance transformation between the unbalanced port and the balanced port.
Claim 14
Dependent Claim
100 words
A filter circuit, comprising: a balanced port; an unbalanced port; a substrate; and a series circuit comprising a filter stage and a balun, the series circuit disposed between the balanced port and the unbalanced port, wherein the balun and the filter stage are formed on the substrate; wherein the balun is a transformer element with two coils, wherein the coils are formed on the substrate; and wherein the filter stage comprises at least one BAW resonator, and wherein the substrate has an acoustic reflector and the at least one BAW resonator and the coils are formed above the acoustic reflector.
Claim 15
Dependent Claim
100 words
A filter circuit, comprising: a balanced port; an unbalanced port; a substrate; and a series circuit comprising a filter stage and a balun, the series circuit disposed between the balanced port and the unbalanced port, wherein the balun and the filter stage are formed on the substrate; wherein the balun is a transformer element with two coils, wherein the coils are formed on the substrate; and wherein the filter stage comprises at least one BAW resonator, and wherein the substrate has an acoustic reflector and the at least one BAW resonator and the coils are formed above the acoustic reflector.
Claim 16
Dependent Claim
24 words
The filter circuit according to claim 12 , wherein the coils are formed by metal traces having thickness between 800 nm and 10 μm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2010-04-02 | 2010-10-02 | 2011-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2014-04-02 | 2014-10-02 | 2015-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2018-04-02 | 2018-10-02 | 2019-04-03 | $7700.00 | Window Closed / Lapsed |