EP3350819A1

EP3350819A1 - Electronic component and electronic signal processing unit comprising such a component

Info

Publication number: EP3350819A1
Application number: EP16756607.4A
Authority: EP
Inventors: Borys Vorotnikov; Oleksander RUBAN; Mykola SHEVELOV; Stefan Freisleben; Georgiy Sevskiy; Patric Heide
Original assignee: SnapTrack Inc
Current assignee: SnapTrack Inc
Priority date: 2015-09-14
Filing date: 2016-08-03
Publication date: 2018-07-25
Also published as: WO2017045836A1; KR20180053675A; DE102015115442A1; CN108140487A; US20190252124A1

Abstract

The invention relates to an electronic component (1) comprising a first and a second base plate (2a, 2b) and a coupling plate (3). The coupling plate (3) is divided into a plurality (N) of strips (6) which do not contact one another, and the strips of the coupling plate extend in their longitudinal direction (L) such that each strip is congruent with both a part of the first base plate (2a) as well as a part of the second base plate (2b) so as to form electric elementary capacitors (Ce). By means of the strips (6), a plurality (N) of electric elementary series capacitors (Cse) connected in parallel are formed between the first and the second base plate (2a, 2b). In this manner, a short circuit (K) at a specific strip (6') causes only a negligible change in the entire series capacitance (Cs) of the component (1).

Description

description

Electronic component and electronic

Signal processing unit with such a device

The invention relates to an electronic component which has at least a first and a second base plate and a coupling plate, wherein between the first base plate and the coupling plate, a first electrical capacitance

is formed and between the second base plate and the

Coupling plate, a second electrical capacitance is formed, so that the first and the second electrical capacitance form a series electrical capacitance between the first and the second base plate.

Electronic components of this type are widely used as so-called cascaded capacitor components in electronic signal processing units, such as

Example SAW or BAW filter (SAW means Surface Acoustic Wave, BAW means Bulk Acoustic Wave), signal extractor, multiplexer, radio frequency (RF) resp

High-frequency modules and so on.

During the production of such cascaded

Due to the process, capacitor components can be used for

Forming a short circuit between individual components of the device come. Such a short circuit can occur in very small affected areas on the device, but have significant effects. For example, a short circuit can lead to one of the two capacitances being short-circuited in the case of two capacitors connected in series in a component of the type described above. The problem with such short circuits is that the total capacitance of the device

is significantly changed. For example, shorting one of two equal sized capacities of a series capacity may result in the total of

Capacity value of the series capacity is doubled. Such capacity changes can lead to a significant

Deteriorate component performance and ultimately the failure of the entire component to the result.

So far, such a problem has been met with technological improvements of the manufacturing process or process quality. However, such approaches entail enormous investment and prevent a risk of short circuits on the components with the explained

Consequences only conditionally.

It is an object of the present invention to provide electronic components of the type discussed above in a simple yet effective manner from significant effects

Short circuit formation on the component to protect or drastically reduce the effects of short circuit formation. This object is achieved by an electronic component of the type described above in that the

Coupling plate is divided into a plurality of mutually contactless strips such that the first and the second electrical capacitance each in a plurality of

electric elementary capacitances are divided and by means of the strips a plurality of parallel electrical elementary series series capacitances between the first and the second base plate are formed. The advantage of a component designed in this way is that a short circuit in a relatively small area of the component has substantially less impact than in the case of conventional components of this type. The fact that the coupling plate is in a plurality of non-contact

Strip is divided, affects a short circuit in a small area on the coupling plate only on one or only a few strips. This means that only one or a few elementary capacities between the coupling plate and the first or the second base plate are short-circuited. Thus, only the capacitance value of one or less elementary series capacitances changes along one or fewer strips of the coupling plate. As a result, the total capacitance value of the electronic component is subject to only very small changes. In this way, a short circuit in a small area on the component has little effect on the functionality and the

Operating behavior of the device. The general advantage of the present invention is thus that by simple structural measures

or small design changes to the component, the overall quality and quality of the device can be dramatically improved without costly changes in the

To make the manufacturing process of the component.

According to one embodiment, the strips of the coupling plate extend in their longitudinal direction such that they each with both a part of the first base plate and with a part of the second base plate to form the

electric elementary capacities are in cover.

Advantageously, the strips of the coupling plate - in the context of production tolerated deviations - identical dimensioned, so have a uniform length and width. In this way, the elementary capacitances formed on each strip between the first and the second base plate and the coupling plate are dimensioned substantially identical. This has the effect of causing a short circuit on a strip of the coupling plate almost

identical effect, such as a short circuit on another strip of the coupling plate. If a short circuit occurs on a strip of the coupling plate, its effects are foreseeable and concretely calculable. It is also conceivable, for example, this via a compensation electronics

or compensatory compensation.

In one embodiment, the distance between each two strips of the coupling plate is at least one

Order of magnitude smaller than the width of a respective one

Strip. For example, the width of a strip is 15 ym, while the distance between each two strips is only 1 ym. Such a dimensioning has the advantage that the distribution of the coupling plate in the plurality of strips has only a very small effect on the dimensions of the entire component and they can be virtually unchanged compared to conventional components. Thus, the changes in the design of the coupling plate according to the above-mentioned type no

or very little impact on the

Dimensions of the device.

In one embodiment, the device is in

Multi-layer construction carried out, wherein the first and second

Base plate form a lower layer, the coupling plate forms an upper layer and between the lower and upper layer, an intermediate layer is formed. In a Embodiment are the first and second base plate and the coupling plate made of electrically conductive material, wherein the intermediate layer is a dielectric. For example, the intermediate layer may be a silicon oxide, for example silicon dioxide (SiO ₂ ). Furthermore, materials such as lithium niobate (Li bOs) or lithium tantalate (Li aOs) come into consideration. Other materials are also conceivable depending on the design and application of the device.

Advantageously, the electronic component of the finds

explained type application in an electronic

Signal processing unit, wherein the

Signal processing unit as SAW or BAW filter,

Signal Extractor, multiplexer, radio frequency module or a combination thereof is executed.

Hereinafter, the invention will be described with reference to several

Drawings explained in more detail.

Show it:

Figure 1A is a schematic plan view of a

Electronic component according to the prior art

Technology,

FIG. 1B shows the plan view according to FIG

Short circuit,

FIG. 2A shows a sectional view of the component according to FIG. 1A along the section axis S-S

FIG. 2B shows a sectional view of the component according to FIG. 1B along the section axis SS FIG. 3A shows an equivalent circuit diagram of the component according to FIGS. 1A and 2A,

FIG. 3B shows an equivalent circuit diagram of the component according to FIGS

FIGS. 1B and 2B,

Figure 4A is a schematic plan view of a

Embodiment of an electronic component according to the invention,

FIG. 4B shows the plan view according to FIG. 4A when occurring

Short circuit,

FIG. 5A shows a sectional view of the component according to FIG. 4A along the section axis S-S

FIG. 5B shows a sectional view of the component according to FIG. 4B along the section axis S-S

FIG. 6A shows an equivalent circuit diagram of the component according to FIGS

FIGS. 4A and 5A and

FIG. 6B shows an equivalent circuit diagram of the component according to FIGS

Figures 4B and 5B.

FIG. 1A shows an electronic component 1 according to the prior art. The component 1 has a first

Base plate 2a and a second base plate 2b and a coupling plate 3 on. Furthermore, a first electrical connection contact is arranged on the first base plate 2 a, which acts as input 4 of the component 1 here. On the second base plate 2b is a second electrical

Connection contact established, which here as the output 5 of Component 1 acts. With the two connection contacts 4 and 5, the component 1 can be electrically contacted in an electronic circuit with other components. The device 1 is a capacitor component with a series capacitance between the first and the second

Base plate 2a and 2b executed. Concretely, a first electrical capacitance C1 is formed between the first base plate 2a and the coupling plate 3 and a second electrical capacitance C2 is formed between the second base plate 2b and the coupling plate 3 (see the schematic illustration in FIG. 2A). The first and second electric capacitances Cl and C2 constitute a series electric capacity Cs between the first and second base plates 2a and 2b. This electrical behavior of the device 1 is also in

Substitute circuit diagram illustrated in FIG 3A. Are the

Capacities C 1 and C 2, for example, have the same dimensions and in each case have the capacitance value C, then the electrical series capacitance Cs is calculated in circuit terms as follows:

Cs = ^C / ₂ .

The device 1 is designed in a multi-layer construction, wherein the first and second base plates 2a and 2b, a lower

Form layer, the coupling plate 3 forms an upper layer and between the lower and upper layer a

Intermediate layer 7 is formed (see structure in Figure 2A). In particular, the first and second base plates 2a and 2b and the coupling plate 3 are made of electrically conductive material. The intermediate layer 7 is a dielectric. The intermediate layer 7 may be, for example, a silicon oxide, for example silicon dioxide (Si0 ₂ ). Further come as

Materials for the interlayer lithium niobate (LiNbOs) or lithium tantalate (Li aOs) depending on the application of the device 1 into consideration.

FIG. 1B shows the component 1 according to the structure from FIG. 1A, wherein in the region of the second base plate 2b

electrical short circuit K between the coupling plate 3 and the second base plate 2b occurs. Such a short circuit K can, for example, during production due to manufacturing

Manufacturing process of the device 1 occur. Due to the short circuit K, the second electrical capacitance C2 between the coupling plate 3 and the second base plate 2b is electrically bridged, as in FIGS. 2B and 3B

illustrated. The total capacity Cs thus becomes

formed solely by the capacity Cl. See FIG. 3B. If the value C continues to be assumed for the capacitance Cl, then the total series capacitance Cs according to FIG. 3B is now calculated to be Cs = C.

Due to the short circuit K, the total capacitance Cs has thus doubled in comparison to the constellation according to FIGS. 1A, 2A and 3A. The capacitance Cs of the device 1 has thus changed significantly due to the short circuit K, as shown in Figures 1B, 2B and 3B. Such a change can cause a significant deterioration of the component performance up to the failure of the entire

Have component 1 result.

To circumvent such a problem, Figure 4A shows a possible embodiment of an electronic component 1 according to the invention. The component 1 has essentially the same structure as the component 1 according to FIG. 1A.

However, the coupling plate 3 in a plurality of

Divided strip 6, which is in a longitudinal direction with of the length L so as to extend between the first and second base plates 2a and 2b, that the strips 6 are respectively formed with both a part of the first base plate 2a and a part of the second base plate 2b to form

electrical capacities are in cover. In this way, the strips 6 fulfill a functionality comparable to the coupling plate 3 according to FIG. 1A.

In contrast to the embodiment of the component 1 according to FIG. 1A, however, electrical signals are present on each strip 6 with respect to the first and second base plates 2a and 2b

Elementary capacitances Ce formed, wherein each two elementary capacitances Ce form an electrical elementary series capacitance Cse along a respective strip 6 between the first and the second base plate 2a and 2b. See also the sectional view in Figure 5A along the cutting axis SS ^λ of Figure 4A.

All strips 6 (five strips are arranged in the embodiment according to FIG. 4A) together form one

A plurality of parallel connected electrical elementary series capacitances Cse, as the equivalent circuit diagram in Figure 6A shows. With five strips 6, this results in five elementary series capacitances Cse connected in parallel. If, in addition, a capacitance value C is assumed for the total electrical capacitance between the strips 6 and the first base plate 2a or between the strips 6 and the second base plate 2b, the value is one

Elementary capacity Ce is the value Ce = where N indicates the number of strips 6 (in the embodiment according to FIG. 4A, N = 5). An elementary series capacitance Cse along a strip 6 thus has the value:

Cse = ^Ce / ₂ . The entire series capacitance Cs of the component 1, which is composed of the sum of the parallel connected elementary series capacitances Cse, can thus

circuit-wise calculated to:

Cs = N x ^Ce / ₂ .

If the above value for the elementary capacitance Ce is used, the value for the total series capacitance Cs is analogous to the explanations according to FIG. 3A:

it = c _{/ 2} .

The strips 6 have a predetermined length L and a predetermined width B and are arranged contactlessly at a respective distance A in such a way that their functionality replicates the coupling plate 3 according to FIG. 1A. The distance A between each two strips 6 may, for example, be at least an order of magnitude smaller than the width B of a respective strip 6. Specifically, the strips 6 have, for example, a width B of 15 ym, while the distance A is 1 ym. Other dimensions and dimensions are of course conceivable depending on the application. Due to such dimensioning, the outer dimensions of the component 1 remain substantially unchanged in comparison to the embodiment according to FIG. 1A. Despite the modified design of the strip 6

divided contact plate 3, the dimensions of the electronic component 1 thus remain virtually unchanged to conventional designs.

Figure 4B shows the device 1 according to Figure 4A, an electrical short circuit occurs at a specific strip 6 ^λ K between the strip 6 ^λ and the second base plate 2b. Due to the short circuit K is thus the

Elementary capacity Ce between the strip 6 ^λ and the second base plate 2b electrically bridged, like the

Sectional view in Figure 5B along the cutting axis SS ^λ according to Figure 4B and also the equivalent circuit diagram in Figure 6B shows.

The division of the contact plate 3 in the plurality of

Strip 6 has the advantage that due to the short circuit K, which relates only to the specific strip 6 ^λ , only a single elementary capacitance Ce is bridged at the specific strip 6 ^λ (see FIG. 6B). Thus, only along a single elementary series capacitance Cse on the specific strip 6 ^λ does the capacitance value of Cse = a ^u Cse Cse = Ce increase. All other elementary series capacitances Cse are furthermore formed electrically from the parallel connection of two elementary capacitances Ce and each have the unchanged value Cse = on. The total capacitance of the component 1 can be calculated in the case of the short circuit K according to FIG. 4B and FIG. 5B to:

Cs = (N-1) Ce / 2 + Ce.

In the case of several short circuits of the number K, the total capacity is generally calculated as:

Cs = (N-K) Ce / 2 + CeK. Substituting for the constellation according to Figure 4B and 5B for an elementary capacitance Ce in turn to Ce , the value for the total capacity according to the equivalent circuit diagram in FIG. 6B is as follows:

At N = 5 strips 6 thus changes in detail

Short circuit case as shown in Figures 4B, 5B and 6B, the total capacitance compared to the constellation according to FIGS. 4A, 5A and 6A from Cs = ^C / ₂ to Cs = ^C / ₂ ^{+ C} / 10

In this way, the total capacitance Cs for a component 1 according to the embodiment in FIG. 4A changes only negligibly in the case of a single short circuit according to FIG. 4B in comparison to the total capacitance without short circuit. Due to simple modifications of the coupling plate 3 by division into a plurality of strips 6 can thus one

Short circuit problem on the device 1 in a simple, yet effective way to be met. In the case of a short circuit, the total capacity changes only slightly, so that the component performance is maintained. In embodiments not shown, a component 1 instead of two base plates 2a and 2b, for example, four, six, eight or any even number

Have base plates which are connected in series via respective coupling plates 3, which are respectively to two base plates in coverage, so that corresponding

Set capacities Cl and C2 between a respective coupling plate and corresponding base plates. All

Coupling plates 3 are advantageous as explained to Figure 4A, divided into a plurality of strips 6.

Electronic components 1 of the type explained are advantageously used in electronic

Signal processing units, for example, as SAW or BAW filter, signal extractor, multiplexer,

Radiofrequency modules or a combination thereof are executed. All illustrated embodiments are chosen by way of example only.

Reference sign list

1 electronic component

2a, 2b base plates

3 coupling plate

4 entrance

5 output

6 strips of the coupling plate

6 ^λ specific strip of the coupling plate

7 intermediate layer

A distance

B Width of a strip

Cl, C2 first / second capacity

Cs serial capacity

Ce elementar capacity

Cse Elementary Series Capacity

K short-circuit path

L length of a strip

N number of stripes

ss ^λ cutting axis

Claims

claims

1. Electronic component (1) at least comprising a first and a second base plate (2a, 2b) and a

Coupling plate (3), wherein between the first base plate (2a) and the coupling plate (3) a first electrical capacitance (Cl) is formed and formed between the second base plate (2b) and the coupling plate (3) has a second electrical capacitance (C2) is, so the first and the second

electrical capacitance (Cl, C2) an electrical

Forming series capacitance (Cs) between the first and second base plates (2a, 2b),

characterized in that

the coupling plate (3) is divided into a plurality (N) of mutually contactless strips (6) such that the first and second electrical capacitances (Cl, C2) are each divided into a plurality (N) of elementary electrical capacitances (Ce) are divided and by means of the strips (6) a plurality of (N) parallel-connected electrical elementary series capacitances (Cse) between the first and the second base plate (2a, 2b) are formed.

2. Electronic component (1) according to claim 1, wherein the strips (6) of the coupling plate (3) in their

Extending longitudinally (L) so that they each with both a part of the first base plate (2a) and with a part of the second base plate (2b) for forming the

electric elementary capacities (Ce) are in cover.

3. Electronic component (1) according to claim 1 or 2, wherein the distance (A) between each two strips (6) of the coupling plate (3) is smaller by at least an order of magnitude than the width (B) of a respective strip (6).

4. Electronic component (1) according to one of claims 1 to 3, wherein the component (1) is designed in multi-layer construction, wherein the first and second base plate (2a, 2b) form a lower layer, the coupling plate (3) an upper layer forms and between the lower and upper layer, an intermediate layer (7) is formed.

5. An electronic component (1) according to claim 4, wherein the first and second base plate (2 a, 2 b) and the coupling plate (3) are made of electrically conductive material and the

Intermediate layer (7) is a dielectric.

6. An electronic signal processing unit, comprising at least one electronic component (1) according to one of claims 1 to 5, wherein the signal processing unit as SAW or BAW filter, signal extractor, multiplexer,

Radiofrequency module or a combination thereof is executed.