EP1719140A1 - Schaltungsanordnung mit einstellbarem kondensator - Google Patents
Schaltungsanordnung mit einstellbarem kondensatorInfo
- Publication number
- EP1719140A1 EP1719140A1 EP05715566A EP05715566A EP1719140A1 EP 1719140 A1 EP1719140 A1 EP 1719140A1 EP 05715566 A EP05715566 A EP 05715566A EP 05715566 A EP05715566 A EP 05715566A EP 1719140 A1 EP1719140 A1 EP 1719140A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- capacitor
- plate elements
- circuit arrangement
- plate
- arrangement according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G5/00—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture
- H01G5/16—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture using variation of distance between electrodes
- H01G5/18—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture using variation of distance between electrodes due to change in inclination, e.g. by flexing, by spiral wrapping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G5/00—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture
- H01G5/16—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture using variation of distance between electrodes
Definitions
- the invention relates to a circuit arrangement with a capacitor arranged on a carrier, which has two capacitor plates and a dielectric layer arranged between the two capacitor plates.
- CMOS capacitor may be mentioned as an example.
- the circuit arrangement is peculiar to the fact that the capacitor provided is of a fixed capacitance which cannot be changed after the capacitor or the complete circuit arrangement to which the capacitor belongs has been manufactured.
- connection come in the case of mobile radio devices, which essentially consist of a high-frequency part and a
- Baseband signal processing part exist, which are implemented in separate chips, when selecting carrier frequencies from the usable frequency bands of the supported radio standards and converting them into an associated baseband, filters are used again and again, which are to be regarded as circuit arrangements with a capacitor.
- Capacitors determine a passband of the filter via their intended capacitance, the passband determining a selection of a carrier frequency from one of the supported mobile radio standards. to Adapting the pass band to a carrier frequency that is currently being used, it is necessary to implement variable capacitances that can be used for the filters mentioned.
- varactors have been used to implement such filters.
- the use of these components has the disadvantages that relatively high control voltages are required for changes in capacitance.
- a quality in connection with the required change in capacity is also considered to be insufficient. Poor quality results in an associated insertion loss, which worsens the signal-to-noise ratio.
- the object of the invention is to specify a circuit arrangement in which the capacitance of a capacitor provided can be varied in a simple manner.
- At least a section of one of the capacitor plates is made up of rotatably mounted electrically conductive plate elements which are electrically decoupled between a first active rotational position, in which they are electrically conductively connected to a fixed section of this capacitor plate in order to expand their area, and in a second Rotational position are electrically switchable and a control device for switching the plate elements is provided.
- a further configuration of the circuit arrangement is at the discretion of the person skilled in the art, so that, depending on the application, more complex electronic devices such as HF filters can be implemented on the basis of the specified circuit arrangement.
- HF filter can be adjusted.
- a ratio between the fixed section of the capacitor plate and the section of the capacitor plate made up of plate elements essentially determines the capacitance variation possibilities.
- the capacity resolution depends on the number and size of the plate elements.
- addresses can be assigned to the plate elements, which the control device accesses to switch the plate elements between the first and the second rotational position.
- adjoining plate elements can be switched over together.
- the plate elements can be addressed individually, so that the greatest possible resolution for the capacitance values is achieved.
- a fixed section of the capacitor plate in combination with at least two is sufficient to implement the capacitor of the circuit arrangement electrically conductive plate elements of the type mentioned.
- the fixed section can be formed solely by a capacitor connection, so that a surface of the capacitor plate, apart from the connection, is produced entirely from the electrically conductive plate elements.
- the capacitor connection is connected to a fixed plate element, while further, switchable plate elements are arranged and designed in such a way that they result in an increasingly expandable capacitor plate structure.
- the fixed section of the capacitor plate can preferably be elongated and at least one row of the plate elements can be arranged adjacent to and along the fixed section.
- the plate elements protrude from the fixed section in their electrically decoupled rotational position, while they are individually connected to the fixed section in the active rotational position. It is obvious that further rows of electrically conductive plate elements can connect to the outside from the fixed section.
- the circuit arrangement is preferably implemented on a semiconductor chip as the carrier, with both the capacitor, any further components that may be present and the control device being integrated there.
- the plate elements are substantially rectangular and of a uniform size.
- the mentioned outer shape allows a simple expansion of the area of the capacitor plate, while the uniform size allows a uniform stepwise capacitance variation.
- it is advantageous for the plate elements if they have an electrically conductive layer, which in the first active position lies in a surface of the capacitor plate, and a bearing section for the rotatable arrangement of the plate element on an axis of rotation.
- the individual plate elements can be supported on the carrier via the axis of rotation and individually pivoted about the axis of rotation between the active and the electrically decoupled rotational position.
- the electrical layer can overlap with a surface of the fixed section.
- the capacitance of the capacitor can also be changed digitally by interconnecting the plate elements. Similar qualities can be achieved as with fixed capacitors. By changing the area of the capacitor, any component scatter that affects the capacitance of the capacitor can be taken into account. The same applies to capacity changes due to
- the capacitance can be adjusted by varying the active area of the capacitor plate. It can be advantageous if the second capacitor plate is also constructed in such a way as that which partially consists of the electrically conductive plate elements.
- Figure 1 is a side view of a capacitor which is part of an electrical circuit arrangement
- FIG. 2 shows a top view of the capacitor according to FIG. 1.
- FIG. 1 shows the basic construction of a capacitor, in which a first capacitor plate of a fixed portion 1 and a plurality of similar plate members lt n. 2 , , 2 n .
- the fixed section 1 is arranged centrally. On both sides of the fixed
- Section 1 is arranged in the sectional view shown in each case a plate element 2 lt 2 2 .
- These two plate elements 2 ⁇ , 2 2 are shown in FIG. 1 by way of example for a row of further plate elements 2 3 , 2 n that continues in FIG. 1 perpendicular to the plane of the drawing.
- the plate elements 2 lf 2 2 are rotatably mounted on respective axes Ai, A 2 , these two axes Ai, A 2 being mounted at a point in the circuit arrangement, not shown in the drawings, to which the capacitor belongs.
- the plate elements 2 X , ..., 2 n are rotatably mounted on a respective axis A x , A 2 , so that the plate elements 2 ⁇ ... 2 n can perform a rotary movement over a predetermined angular section.
- the plate elements 2 lt ..., 2 n can have a through hole for receiving a respective axis A 17 A 2 .
- the plate elements 2 lt ..., 2 n are arranged on a respective web, over the edge of which they can be tilted between the active and the electrically decoupled rotational position. In this embodiment, the web would lf in a respective recess provided on a lower surface of the plate members 2, ..., 2 n , which extends in the direction of the respective axis Ai, A 2 .
- the respective axis Ai, A 2 is positioned so that there is a bistable balance for both the active rotational position and for the electrically decoupled rotational position.
- the plate element 2 2 shown on the left in FIG. 1 is in an active rotational position in which an electrically conductive layer 3 on an upper side of the plate element 2 2 is connected to the electrically conductive fixed section 1 for expanding a capacitor area of the capacitor plate discussed here. Specifically, the electrically conductive layer 3 overlaps with the fixed section 1.
- the plate element 2 1 is shown on the right in a passive position in which an electrical
- a metallic surface 4, which forms the second capacitor plate, is provided as a further electrode of the capacitor.
- a dielectric layer 5 with a dielectric constant ⁇ r is arranged between the two capacitor plates.
- the capacitor plate formed from a metallic layer 4 also has an associated capacitor connection.
- the fixed section 1 is elongated and on each side is a row of plate elements 2 ⁇ (shown without a bearing section). , , 2 n has.
- a total of ten plate elements 2 lt ..., 2 10 are provided, of which the plate elements of the row to which the plate element 2 2 belongs are in an active and the plate elements of the second row in a passive rotational position.
- an active area of the first capacitor plate is 2/3 of the total possible area.
- the extent of the fixed section 1 in the longitudinal direction can be significantly larger, while a row of plate elements 2 1,..., 2 n can also comprise a considerably larger number of plate elements.
- Embodiments of the invention can connect from the fixed section 1 to the outside to the two rows of plate elements 2 lr ..., 2 n each further rows of plate elements, which can be switched from the inside to the outside. It is also possible for the fixed section 1 not to be elongated, but to assume, for example, a rectangular shape. Its design depends primarily on the way in which the electrical connection of the plate elements 2 lr ...,. 2 n is possible in a simple manner.
- the area of the fixed section 1 is approximately one third of the area of the associated capacitor plate, which can be formed with the help of both rows of plate elements 2 ⁇ , ... 2 10 together with the fixed section 1. If it is assumed that both rows of plate elements 2 X , 2 n each comprise 128 plate elements, based on the capacitance value that results solely from the fixed section 1 and the metallic layer 4, one would be
- a required capacitance variation can be between 0.3 pF and 1 pF, a relative dielectric constant assuming the value "90" and a distance between the two capacitor plates being a few ⁇ m. With this configuration, it would be possible to implement the capacitor in an area of less than 1 mm 2 .
- a control device (not shown), which is also implemented as a component of the circuit arrangement, is used to control the plate elements 2 1 ... 2 n .
- Control signals from the control device are fed to the individual plate elements 2 lt ..., 2 n via a suitable bus system.
- each plate element 2 lr ..., 2 n is equipped with a pair of control electrodes 7, 8, on which the control signals from the control device are present.
- the respective pairs of control electrodes 7, 8 are located on the side of the plate elements 2 X 1 ..., 2 n facing away from the substrate 6.
- the pairs of control electrodes 7, 8 interact with metallic surfaces on an upper side of the plate elements ⁇ , ..., 2 n , in order to set a respectively desired rotational position for individual plate elements 2 lt ..., 2 n .
- Appropriate polarity of the electrodes causes electrostatically attractive or repulsive forces, so that torques can be exerted on the plate elements 2 1 ..., 2 n .
- the plate elements 2 lr ..., 2 n are for the
- Control device individually addressable so that there is a desired size of the area of the first capacitor plate the fixed section 1 and the plate elements 2, ..., 2 n , can be adjusted.
- Configurations of the capacitor can be saved and called up.
- the circuit arrangement can also be used in particular in the field of mobile radio technology. It can form a tunable diplexer / duplexer, a tunable front-end filter, a tunable oscillator or generally a tunable filter in a correspondingly supplemented overall configuration.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200410009133 DE102004009133B3 (de) | 2004-02-25 | 2004-02-25 | Schaltungsanordnung mit einstellbarem Kondensator |
| PCT/EP2005/002035 WO2005081273A1 (de) | 2004-02-25 | 2005-02-22 | Schaltungsanordnung mit einstellbarem kondensator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1719140A1 true EP1719140A1 (de) | 2006-11-08 |
Family
ID=34853656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05715566A Withdrawn EP1719140A1 (de) | 2004-02-25 | 2005-02-22 | Schaltungsanordnung mit einstellbarem kondensator |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1719140A1 (de) |
| DE (1) | DE102004009133B3 (de) |
| WO (1) | WO2005081273A1 (de) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5696662A (en) * | 1995-08-21 | 1997-12-09 | Honeywell Inc. | Electrostatically operated micromechanical capacitor |
| US6242989B1 (en) * | 1998-09-12 | 2001-06-05 | Agere Systems Guardian Corp. | Article comprising a multi-port variable capacitor |
-
2004
- 2004-02-25 DE DE200410009133 patent/DE102004009133B3/de not_active Expired - Fee Related
-
2005
- 2005-02-22 WO PCT/EP2005/002035 patent/WO2005081273A1/de not_active Ceased
- 2005-02-22 EP EP05715566A patent/EP1719140A1/de not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2005081273A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2005081273A1 (de) | 2005-09-01 |
| DE102004009133B3 (de) | 2005-09-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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| 17P | Request for examination filed |
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| AK | Designated contracting states |
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| 19U | Interruption of proceedings before grant |
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| 19W | Proceedings resumed before grant after interruption of proceedings |
Effective date: 20070702 |
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| 19W | Proceedings resumed before grant after interruption of proceedings |
Effective date: 20091201 |
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| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: PALM, INC. |
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| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. |
|
| DAX | Request for extension of the european patent (deleted) | ||
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: QUALCOMM INCORPORATED |
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| GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
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| INTG | Intention to grant announced |
Effective date: 20150320 |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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| 18D | Application deemed to be withdrawn |
Effective date: 20150731 |