KR20140076959A

KR20140076959A - Single pole double throw switch

Info

Publication number: KR20140076959A
Application number: KR20120145568A
Authority: KR
Inventors: 최재혁; 박성환
Original assignee: 삼성전기주식회사
Priority date: 2012-12-13
Filing date: 2012-12-13
Publication date: 2014-06-23
Also published as: KR101771745B1

Abstract

The present invention relates to a switching circuit. A switching circuit according to an embodiment of the present invention includes a transmitter and a receiver. The transmitter includes a plurality of amplification elements connected in series, and provides a transmission signal provided from a transmitter to an antenna. The receiving unit provides the receiving signal provided from the antenna to the receiving end. Here, the transmission unit uses at least a part of the plurality of amplification devices according to the magnitude of the output of the transmission signal.

Description

{SINGLE POLE DOUBLE THROW SWITCH}

TECHNICAL FIELD The present invention relates to an attribute switch, and more particularly, to an attribute switch capable of performing shunt grounding without being influenced by an external environment by using virtual grounding.

With the development of wireless communication technology, various communication standards are being used simultaneously. In addition, with the miniaturization of the wireless communication module and the high performance of the portable terminal, it is required to apply a plurality of communication standards to one portable terminal. Therefore, the number of frequency bands to be supported by one mobile phone is increasing.

In accordance with these trends, support for various frequency bands is also required in the field of RF front-end. For example, RF switches located on a signal path between an antenna and an RF chipset are required to support various frequency bands. Accordingly, a single pole duplex switch can be used in various parts .

Such an RF switch should have excellent insertion loss to reduce signal loss and excellent linearity and isolation characteristics in order to minimize interference between various frequency bands.

However, in the conventional single-pole double-throw switch, noise or the like enters from the outside through the ground terminal, and linearity and isolation characteristics are deteriorated.

The patent documents described in the following prior art documents are patents relating to switches. However, these Patent Documents do not disclose matters preventing noise from entering from the outside through the ground.

Korean Patent Publication No. 2011-0068585 Japanese Unexamined Patent Application Publication No. 1997-214201

SUMMARY OF THE INVENTION An object of the present invention is to provide an attribute switch with enhanced insertion loss and isolation characteristics by performing grounding without being influenced by an external environment by using virtual ground for solving the problems of the prior art described above.

The first technical aspect of the present invention proposes an attribute switch. The attribute switch includes a transmitter, a receiver, and a receiver shunt. The transmitter includes a plurality of amplification elements connected in series, and provides a transmission signal provided from a transmitter to an antenna. The receiving unit provides the receiving signal provided from the antenna to the receiving end. The receiving end is connected to the receiving end of the shunt part in parallel with the receiving part to prevent the isolation signal corresponding to the transmission signal from flowing to the receiving end.

In one embodiment, the receiving end shunt portion may be connected at one end to the receiving portion and the receiving end, and the other end may form a virtual ground.

In one embodiment, the virtual ground may invert the phase of the isolation signal to virtually ground the isolation signal.

In one embodiment, the virtual ground may comprise a transmission line formed by a quarter of the wavelength of the isolation signal.

In one embodiment, the attribute switch may further include a transmitter shunt portion. The transmission shunt section may be connected to the transmission section in parallel with the transmission section to prevent an isolation signal corresponding to the reception signal from flowing to the transmission terminal.

In one embodiment, the receiver shunt and the transmitter shunt may include a virtual ground that inverts the isolation signal to virtually ground the isolation signal.

In one embodiment, the virtual ground may comprise a transmission line formed with a quarter length of the wavelength of the isolation signal.

According to one embodiment of the present invention, insertion loss and isolation characteristics can be enhanced by performing grounding without being influenced by the external environment by using virtual ground.

1 is a simplified circuit diagram showing an example of an attribute switch.
Fig. 2 is a reference diagram for explaining the flow of signals in the equipment switch of Fig. 1. Fig.
Fig. 3 is a simplified circuit diagram showing an embodiment of an attribute switch further comprising a shunt part. Fig.
Fig. 4 is a reference diagram for explaining the flow of signals in the equipment switch of Fig. 3; Fig.
5 is a simplified circuit diagram showing an embodiment of an attribute switch according to the present invention.
FIG. 6 is a reference diagram for explaining the flow of signals in the equipment switch of FIG. 5; FIG.
Fig. 7 is a simplified circuit diagram showing another embodiment of the attribute switch according to the present invention.
8 is a reference graph for explaining characteristics of an attribute switch according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected to the other element, but there may be other elements in between. On the other hand, when an element is referred to as being "directly connected" to another element, it should be understood that there are no other elements in between. Also, other expressions describing the relationship between the components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

In the drawings referred to in the present invention, elements having substantially the same configuration and function will be denoted by the same reference numerals, and the shapes and sizes of the elements and the like in the drawings may be exaggerated for clarity.

1 is a simplified circuit diagram showing an example of an attribute switch.

An attribute switch may include two ends, i.e., a transmitting end and a receiving end, connected to one antenna.

The attribute switch may include a transmitter 100 and a receiver 200.

The transmitter 100 may amplify the transmission signal provided from the transmitter and provide the amplified transmission signal to the antenna, and the receiver 200 may provide the reception signal provided from the antenna to the receiver.

The transmission unit 100 and the reception unit 200 may include amplification devices. The amplification element included in the transmission unit 100 can amplify the transmission signal input from the transmission terminal and provide it to the antenna.

The receiving unit 200 may provide the receiving signal provided from the antenna to the receiving end. If necessary, the receiver 200 may include an amplification element to amplify the received signal and provide the amplified signal to the receiver.

In FIG. 1, a plurality of amplification elements are connected in series in the transmission section 100 and the reception section 200, but this is merely an example. Therefore, the present invention does not particularly limit the existence or the number of the amplification elements included in the transmission section 100 and the reception section 200.

The transmission unit 100 can receive a transmission control signal, and the reception unit 200 can receive a reception control signal. Here, the transmission control signal and the reception control signal can have mutually opposite values.

For example, when the transmission control signal is ON, the service switch performs the transmission operation, and the amplification element of the transmission unit 100 can amplify the transmission signal. Accordingly, the reception control signal is turned off, and the reception unit 200 does not perform any operation. Such an example will be described in more detail with reference to FIG.

Fig. 2 shows a flow of a signal when the attribute switch of Fig. 1 performs a transmission operation.

In Fig. 2, St means the flow of the transmission signal, and Si means the flow of the isolation signal.

As shown in the figure, the transmission signal St may be input from the transmitting terminal and amplified through the amplifying element of the transmitting unit 100. The amplified transmission signal can be transmitted to the outside through the antenna. In this transmission process, an isolation signal Si caused by the transmission signal can be generated. The isolation signal Si may flow to the receiving end through the receiving unit 200. [

Such an isolation signal can degrade the sensitivity of wireless communication and cause malfunctions. Therefore, an attribute switch circuit for preventing such isolation signal Si from being sent to the receiving end will be described below.

FIG. 3 is a simplified circuit diagram showing an embodiment of an attribute switch further including a shunt portion, and FIG. 4 is a reference diagram for explaining a flow of a signal in the attribute switch in FIG.

Referring to FIGS. 3 and 4, the attribute switch further includes a receiver shunt unit 300.

The receiver shunt unit 300 can prevent the isolation signal Si from being transmitted to the receiving end. For this purpose, the receiving shunt unit 300 may be connected in parallel to the front end of the receiving unit to ground the isolation signal Si.

That is, one end of the receiving end shunt unit 300 may be connected to the receiving end in parallel, and the other end may be connected to the ground. In the illustrated example, the receiver shunt unit 300 may include a switching element receiving a predetermined control signal.

Here, the control signal input to the receiver shunt unit 300 may have the same value as the transmission control signal. This is because the receiver shunt unit 300 must also operate when the attribute switch performs a transmission operation.

However, in such an embodiment, the effect of grounding may occur. That is, if the ground is unstable due to the external environment, the isolation signal Si can not be transmitted to the ground side well, and the isolation characteristic may be deteriorated. Particularly, when noise is generated in the antenna system, if a noise component is included in the ground, a serious error may be caused.

In addition, when the equipment switch performs a transmitting operation, the amplifying elements of the receiving unit 200 can operate as a capacitor. Therefore, as the frequency of the transmitting signal St increases, more isolation signals Si can pass therethrough, The characteristics may be deteriorated.

To this end, the present invention provides an attribute switch capable of blocking external influences using virtual ground and improving isolation characteristics. Hereinafter, the attribute switch according to the present invention will be described in more detail with reference to FIGS. 5 to 8. FIG. However, the same or equivalent contents as those described above with reference to Figs. 1 to 4 will not be described in duplicate below.

FIG. 5 is a simplified circuit diagram showing an embodiment of an attribute switch according to the present invention, and FIG. 6 is a reference diagram for explaining a flow of a signal in the attribute switch in FIG.

5 and 6, an embodiment of the attribute switch may include a transmitter 100, a receiver 200, and a receiver shunt unit 300.

The transmission unit 100 includes a plurality of amplification elements connected in series, and can provide a transmission signal provided from a transmission terminal to an antenna.

The receiving unit 200 may provide the receiving signal provided from the antenna to the receiving end.

The receiving shunt unit 300 is connected to the receiving unit 200 in parallel with the receiving unit 200 to prevent the isolation signal corresponding to the transmitting signal from flowing to the receiving unit.

In one embodiment, one end of the receiver shunt unit 300 may be coupled to the receiver 200 and the receiver, and the other end may form a virtual ground 310.

Here, the virtual ground is a means for inverting the phase of the isolation signal Si and virtually grounding the isolation signal Si.

In one embodiment, the virtual ground may be formed of an open load end and a transmission line connected thereto.

Here, the length of the transmission line may be related to the wavelength of the isolation signal Si. That is, the length of the transmission line may correspond to 1/4 length of the wavelength of the isolation signal Si. This will be described in more detail with reference to the following equations (1) and (2).

Equation (1) is a mathematical expression relating to impedance of a transmission line having an open bottom end. Here,? Is a phase constant and L is the length of the transmission line.

Assuming that the phase constant beta is 2n / lambda and the length L of the transmission line is 1/4 of the wavelength (i.e., lambda / 4), Equation 1 can be calculated as Equation 2 below.

Therefore, it can be seen that the input point to the transmission line terminated in the open state has the same potential as the ground, and becomes virtual ground.

Further, when the wavelength of the isolation signal corresponds to the wavelength of the transmission signal, the length L of the transmission line may correspond to 1/4 of the wavelength of the transmission signal.

Fig. 7 is a simplified circuit diagram showing another embodiment of the attribute switch according to the present invention.

Another embodiment shown in FIG. 7 relates to an embodiment that further includes a transmitter shunt portion 400 for one embodiment of FIG.

Referring to FIG. 7, the attribute switch may further include a transmitter shunt unit 400.

The transmitter shunt unit 400 is connected to the transmitter in parallel with the transmitter so that the isolation signal corresponding to the receiver signal can be prevented from flowing to the transmitter.

Here, the transmitting shunt unit 400 inverts the phase of the isolation signal to virtually ground the isolation signal, and the virtual ground can be formed to have a length of 1/4 of the wavelength of the isolation signal as described above .

8 is a reference graph for explaining characteristics of an attribute switch according to the present invention.

8 is a graph showing insertion loss of an attribute switch using virtual ground according to the present invention, and graph (b) shows isolation characteristics of an attribute switch using virtual ground according to the present invention Graph.

As shown in the graph (a), it can be seen that the SPIDIT switch according to the present invention has a higher insertion loss in the frequency band of 3G or more than the conventional one.

Also, as shown in graph (b), it can be seen that the attribute switch according to the present invention has excellent isolation characteristics in a specific band.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken as a limitation upon the scope of the invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100:
200: Receiver
300: Receiver shunt unit
310: virtual ground
400: transmitting shunt part
410: virtual ground

Claims

A transmitter including a plurality of amplification elements connected in series and providing a transmission signal provided from a transmitter to an antenna; And
A receiving unit for providing a receiving signal provided from the antenna to a receiving terminal; And
A receiving shunt unit connected to the receiving unit in parallel with the receiving unit to prevent an isolation signal corresponding to the transmission signal from flowing to the receiving unit; The switch comprising:

The receiver according to claim 1,
One end connected to the receiving unit and the receiving end, and the other end forming a virtual ground.

3. The method of claim 2, wherein the virtual ground
And inverting the phase of the isolation signal to virtually ground the isolation signal.

3. The method of claim 2, wherein the virtual ground
And a transmission line formed to have a length of 1/4 of the wavelength of the isolation signal.

The apparatus of claim 1, wherein the attribute switch
A transmitting shunt unit connected to the transmitting unit in parallel with the transmitting unit to prevent an isolation signal corresponding to the receiving signal from flowing to the transmitting unit; Further comprising an address switch.

6. The receiver according to claim 1 or 5, wherein the receiving shunt section and the transmitting section shunt section
A virtual ground for inverting the phase of the isolation signal and grounding the isolation signal virtually; The switch comprising:

7. The method of claim 6, wherein the virtual ground
And a transmission line formed to have a length of 1/4 of the wavelength of the isolation signal.