KR101204552B1 - Rf transceiver - Google Patents

Abstract

PURPOSE: A wireless transmission and reception apparatus is provided to solve a problem generated by a leakage signal using a filter. CONSTITUTION: A first switch unit(SW1) is included between an antenna and a first input and output unit. A second switch unit(SW2) is included between the antenna and a second input and output unit. The one end of a first filter(F1) is connected to space between the first switch unit and the first input and output unit. Other end of the first filter is connected to a ground terminal. The one end of a second filter(F2) is connected between the second switch unit and the second input and output unit. Other end of the second filter is connected with the ground terminal.

Description

Radio transceiver {RF TRANSCEIVER}

The present invention relates to a wireless transceiver.

Recently, technologies for miniaturization, light weight, and low power operation of various wireless communication devices have been rapidly developed.

In accordance with the development of the related technology, a single antenna transmits and receives radio signals in various frequency bands, and implements miniaturization and weight reduction of the radio transceiver by processing each radio signal through a separate input / output unit.

In general, when one antenna includes two or more input / output units, a switch is provided between the antenna and the input / output units so that the input / output units do not affect each other.

On the other hand, various transistors are mainly used as the switch. If the wireless signal is stronger than a predetermined standard, there is a problem that noise may occur due to leakage of the signal even though the transistor is in an off state.

Patent Document 1 proposes a technique for solving the above problems.

The technique proposed in Patent Literature 1 further includes a shunt switch having one end connected between the input / output unit and the switch and the other end grounded, thereby inducing a leakage signal to the ground terminal even when the switch is turned off. The conventional problem was solved.

However, according to the configuration proposed in Patent Document 1, since a separate configuration for controlling the shunt switch is required, there is a limit in miniaturization of the wireless transceiver.

In addition, since the shunt switch must be driven to consume power, there is a limit to low power operation.

Patent Document 1: US Patent Publication No. 2003/0090313

The present invention devised to solve the above problems, an object of the present invention is to provide a wireless transmission and reception apparatus that can solve the problem caused by the leakage signal without the consumption of additional power and control means.

In order to achieve the above object, a wireless transceiver according to an embodiment of the present invention includes an antenna; A first input and output unit connected to the antenna; A second input / output unit connected to the antenna; A first switch provided on and off between the antenna and the first input / output unit; A second switch provided on / off between the antenna and the second input / output unit; A first filter having one end connected between the first switch and the first input / output unit and the other end connected to a ground terminal; And a second filter having one end connected between the second switch and the second input / output unit and the other end connected to the ground terminal.

In this case, the first switch and the second switch may be complementary on / off.

In addition, the first filter is a filter for passing the signal of the frequency band to be processed in the second input and output unit, the second filter is a filter for passing the signal of the frequency band to be processed in the first input and output unit, The signal to be processed in the first input / output unit and the second input / output unit may be signals of different frequency bands.

In this case, the first filter and the second filter may be a band pass filter (BPF).

The first filter may be a high pass filter, and the second filter may be a low pass filter.

In addition, the first filter and the second filter may include an inductor and a capacitor, and the capacitor may be a multilayer ceramic capacitor or a low temperature cofired ceramic capacitor.

In addition, the first filter and the second filter may include an inductor and a capacitor, and the inductor may be a multilayer ceramic inductor or a low temperature cofired ceramic inductor.

In this case, the capacitor may be mounted inside an integrated circuit chip controlling the first switch and the second switch, and the inductor may be provided outside the integrated circuit chip.

The wireless transceiver according to the embodiment of the present invention configured as described above can solve the problem caused by the short-circuit failure by using a filter instead of the conventional shunt switch, and thus it is possible to miniaturize and reduce power consumption. to provide.

1 is a view schematically illustrating a wireless transceiver according to an embodiment of the present invention.

The advantages and features of the present invention and the techniques for achieving them will be apparent from the following detailed description taken in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The present embodiments are provided so that the disclosure of the present invention is not only limited thereto, but also may enable others skilled in the art to fully understand the scope of the invention. Like reference numerals refer to like elements throughout the specification.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. As used herein, 'comprise' and / or 'comprising' refers to a component, step, operation and / or element that is mentioned in the presence of one or more other components, steps, operations and / or elements. Or does not exclude additions.

Hereinafter, the configuration and operation effects of the present invention will be described in more detail with reference to the accompanying drawings.

1 is a view schematically illustrating a wireless transceiver according to an embodiment of the present invention.

Referring to FIG. 1, a wireless transceiver according to an embodiment of the present invention includes an antenna ANT, a first input / output unit P1, a second input / output unit P2, a first switch SW1, and a second switch. (SW2), the first filter (F1) and the second filter (F2) may be implemented.

The antenna ANT performs a function of transmitting or receiving a radio signal and may transmit and receive signals of different frequency bands.

The first I / O unit P1 and the second I / O unit P2 receive and process a signal received by the antenna ANT, or transmit a signal through the antenna ANT.

In this case, the first input / output unit P1 and the second input / output unit P2 may process signals of different frequency bands.

For example, the first input / output unit P1 may process a signal in the 800 MHz band, and the second input / output unit P2 may process a signal in the 1700 MHz band.

The first switch SW1 and the second switch SW2 are provided between the first input / output unit P1 and the antenna ANT and between the second input / output unit P2 and the antenna ANT, respectively. Can be.

In this case, the first switch SW1 and the second switch SW2 may be controlled to be complementarily on / off. For example, when the first switch SW1 is in an on state, the second switch SW2 is turned on. The second switch SW2 should be turned off when the second switch SW2 is turned on.

One end of the first filter F1 is connected between the first switch SW1 and the first input / output unit P1, and the other end is grounded. In addition, one end of the second filter F2 is connected between the second switch SW2 and the second input / output unit P2, and the other end thereof is grounded.

In this case, the first filter (F1) is a filter (F1) for passing the signal of the frequency band to be processed in the second input and output unit (P2), the second filter (F2) is the first input and output unit (P1). The filter F1 passes through a signal of a frequency band to be processed in, and the signals to be processed in the first input / output unit P1 and the second input / output unit P2 may be signals of different frequency bands.

For example, assuming that the first input / output unit P1 processes a signal in the 800 MHz band, and the second input / output unit P2 processes a signal in the 1700 MHz band, the first filter F1 may output a signal in the 1700 MHz band. By passing the signal to the ground terminal, the signal to be processed in the second input / output unit P2 leaks to the first input / output unit P1.

In this case, the first filter F1 and the second filter F2 may be a band pass filter (B1). For example, the first filter F1 may be implemented as a filter F1 that passes only signals in the 1700 MHz band and blocks signals in the remaining frequency bands.

In addition, the first filter F1 may be a high pass filter (HPF), and the second filter F2 may be a low pass filter (LPF).

Meanwhile, the filters F1 and F2 may generally include an inductor and a capacitor. In the wireless transceiver according to the exemplary embodiment of the present invention, the capacitor may be a multilayer ceramic capacitor or a low temperature cofired ceramic capacitor for miniaturization and low power. Inductors can be implemented using multilayer ceramic inductors or low temperature cofired ceramic inductors.

In addition, when comparing the sizes of the inductors and the capacitors constituting the filters F1 and F2, since the size of the inductor is relatively large, only the capacitor is mounted inside the integrated circuit chip to reduce the size of the integrated circuit chip. It may be provided outside the integrated circuit chip.

The foregoing detailed description is illustrative of the present invention. In addition, the foregoing description merely shows and describes preferred embodiments of the present invention, and the present invention can be used in various other combinations, modifications, and environments. That is, it is possible to make changes or modifications within the scope of the concept of the invention disclosed in this specification, the disclosure and the equivalents of the disclosure and / or the scope of the art or knowledge of the present invention. The above-described embodiments are for explaining the best state in carrying out the present invention, the use of other inventions such as the present invention in other states known in the art, and the specific fields of application and uses of the invention are required. Various changes are also possible. Accordingly, the detailed description of the invention is not intended to limit the invention to the disclosed embodiments. It is also to be understood that the appended claims are intended to cover such other embodiments.

ANT: Antenna
P1: first input / output unit
P2: second input / output unit
SW1: first switch
SW2: second switch
F1: first filter
F2: 2nd filter

Claims (8)

antenna;
A first input and output unit connected to the antenna;
A second input / output unit connected to the antenna;
A first switch provided on and off between the antenna and the first input / output unit;
A second switch provided on / off between the antenna and the second input / output unit;
A first filter having one end connected between the first switch and the first input / output unit and the other end connected to a ground terminal; And
A second filter having one end connected between the second switch and the second input / output unit and the other end connected to a ground terminal;
Containing
Radio transceiver.
The method of claim 1,
Wherein the first switch and the second switch is complementary on / off
Radio transceiver.
The method of claim 1,
The first filter is a filter for passing the signal of the frequency band to be processed in the second input and output unit,
The second filter is a filter for passing the signal of the frequency band to be processed in the first input and output unit,
The signal to be processed in the first input / output unit and the second input / output unit may be signals of different frequency bands.
Radio transceiver.
The method of claim 3,
The first filter and the second filter is a band pass filter (BPF)
Radio transceiver.
The method of claim 1,
The first filter is a high pass filter, the second filter is a low pass filter
Radio transceiver.
The method of claim 1,
The first filter and the second filter includes an inductor and a capacitor,
The capacitor is a multilayer ceramic capacitor or a low temperature cofired ceramic capacitor.
Radio transceiver.
The method of claim 1,
The first filter and the second filter includes an inductor and a capacitor,
The inductor is a multilayer ceramic inductor or a low temperature cofired ceramic inductor.
Radio transceiver.
8. The method according to claim 6 or 7,
The capacitor is mounted in an integrated circuit chip that controls the first switch and the second switch,
The inductor is provided outside the integrated circuit chip,
Radio transceiver.

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