KR20010003080A - Apparatus for blocking of tx or rx signal which is flow into rx or tx unit in portable wireless telephone set - Google Patents

Abstract

PURPOSE: An apparatus for interrupting transmitting and receiving signal interference of a mobile terminal is provided to interrupt the desertion of transmitting and receiving signal to a transmitting terminal or a receiving terminal. CONSTITUTION: A transmitting terminal(191) consisting the first mixer(120), the first band pass filter(130), a power amplifier(140) up converts an input signal and then amplifies the signal. A receiving terminal(190) including a low noise amplifier(160), the second band pass filter(170), the second mixer(180), and low noise-amplifies and down converts a radio signal inputted through an antenna. A duplexer(150) connects the antenna with the transmitting terminal(191) or the receiving terminal(190). A local oscillator(110) supplies the mixers(120,180) with frequency. The first interrupting part(100) is formed between the local oscillator(110) and the transmitting terminal(191) for connecting the frequency generated in the local oscillator(110) to the transmitting terminal(191) and interrupting to transmit the signal deserted in the transmitting terminal(191) to the receiving terminal(190). The second interrupting part(101) is formed between the local oscillator(110) and the receiving terminal(190) for connecting the frequency generated in the local oscillator(110) to the receiving terminal(190) and interrupting to transmit the signal deserted in the transmitting terminal(191) to the receiving terminal(190).

Description

Blocking device for transmitting / receiving signal of portable wireless terminal {APPARATUS FOR BLOCKING OF TX OR RX SIGNAL WHICH IS FLOW INTO RX OR TX UNI IN PORTABLE WIRELESS TELEPHONE SET}

The present invention relates to a transmission and reception terminal apparatus of a portable wireless terminal, and more particularly, to a device for solving the problem that interference and interference caused by the transmission and reception of the signal to the transmitting or receiving end.

In general, portable wireless terminals share an antenna for transmission and reception. That is, the transmitting antenna and the receiving antenna are the same. In addition, the intermediate frequency is shared. 1950 ± 30MHz, 2140 ± [±] 30MHz, 380 ± 2.5MHz, 190 ± 2.5MHz are selected and used as the transmit / receive frequency and intermediate frequency in the communication system using WCDMA (Wide Band Code Division Multiple Access). The difference between the transmission and reception frequency is 190MHz, which is the same as the reception intermediate frequency, resulting in a mixed frequency caused by nonlinearity of the active element, causing interference to the receiving end of the reception intermediate frequency band. The main cause of this interference signal is the transmission signal. The transmission signal is induced to the receiving end through a path for supplying the local oscillation signal, so that there is a problem that intermodulation occurs at the receiving end.

Accordingly, an object of the present invention is to provide an apparatus for blocking a transmission / reception signal from being transmitted to a transmitting end or a receiving end in a portable wireless terminal.

Another object of the present invention is to provide a device capable of preventing cross-modulation and interference due to a transmission / reception signal in a transceiver device of a portable wireless terminal.

In order to achieve the above objects, the present invention provides a device for blocking a transmission signal induced from a portable wireless terminal to a receiving end, the receiving end for downconverting a received wireless signal, and up-converting and amplifying a signal to be transmitted. And a local oscillator for generating a frequency to be supplied to the transmitting end and the receiving end, and a blocking unit connected to the local oscillator and the transmitting end to block the signal of the transmitting end from being induced to the receiving end.

1 is a schematic block diagram of a wireless terminal transceiver for blocking transmission of a transmission signal to a receiver according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Specific details appear in the following description, which is provided to aid a more general understanding of the present invention, and it should be understood by those skilled in the art that the present invention may be practiced without these specific details. It will be self explanatory. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a schematic block diagram of a wireless terminal transceiver for blocking transmission of a transmission signal to a receiver according to an embodiment of the present invention.

The transmitting and receiving end of the wireless terminal is largely composed of a transmitting end 191, a receiving end 190, the duplexer 150 and an antenna. The transmitter 191 upconverts and amplifies an input signal and outputs the amplified signal. The receiver 190 low noise amplifies and down converts the wireless signal received through the antenna. The transmitter 191 consists of a first mixer 120, a first band pass filter 130, and a power amplifier 140. The receiver 190 includes a low noise amplifier (LNA: LOW NOISE AMPLIFIER, 160), a second band pass filter 170, and a second mixer 180. The duplexer 150 connects the antenna and the transmitting end 191 or the receiving end 190 by a transmitting and receiving operation. The local oscillator 110 supplies a frequency to the mixers 120 and 180 of the transmitter 191 or the receiver 190. The transmission signal input to the first mixer 120 at the time of transmission by the path for supplying the frequency is induced to the receiving end 180, causing a problem as described in the prior art. In the present invention, in order to solve the above-described problem, the first blocking unit 100 is disposed between the local oscillator 110 and the transmitter 191, and the second blocking unit is disposed between the local oscillator 110 and the receiver 190. The first blocker 100 allows the frequency component generated by the local oscillator 110 to be connected to the transmitter 191, and blocks the signal generated by the transmitter 191 from being transmitted to the receiver 190. The second blocker 101 allows the frequency component generated by the local oscillator 110 to be connected to the receiver 190, and blocks the signal generated by the transmitter 191 from being transmitted to the receiver 190. As mentioned in the prior art, the transmission frequency of the transmitter is higher than the frequency component of the receiver, and is different from the frequency component generated by the local oscillator 110. Accordingly, a band pass filter such as a low pass filter or a high pass filter is used for the blocking units 100 and 101, or an isolator is used to block the transmission signal of the transmitting end 191 to the receiving end 190. In the above-described embodiment, both the first blocking part 100 and the second blocking part 101 are provided, but it may be configured alternatively.

Briefly, the present invention is as follows.

The component output from the local oscillator 110 through the first or second blocking unit 100, 101 is connected to the transmitting end 191 or the receiving end 190, and the transmitting end 191 signal is transmitted to the receiving end 190. Do not

In the above-described embodiment of the present invention, the operation of blocking transmission of the transmission signal to the receiving end has been described.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by the equivalents of the claims of the present invention.

As described above, the present invention provides a local oscillation unit and a blocking unit at the transmitting end or the receiving end to block the transmission signal transmitted from the transmitting end to the receiving end, thereby preventing intermodulation and interference due to the transmission signal.

Claims (4)

In the transmission and reception signal interference blocking device of a portable wireless terminal, A transmitter having a first mixer for up-converting a transmission signal to be transmitted through the antenna; A receiver having a second mixer for down-converting the received signal received through the antenna; A local oscillator generating one local oscillation frequency and supplying it to the first mixer and the second mixer; And a cut-off unit configured to block transmission / reception signals induced between the first mixer and the second mixer by being located at a path where the one local oscillation frequency is supplied to the first mixer and the second mixer. Signal Interference Blocker. The method of claim 1, wherein the blocking unit, Device characterized in that it is a low pass filter or a high pass filter or isolator. An apparatus for cutting off a transmission signal induced from a portable wireless terminal to a receiving end, A receiving end for downconverting the received wireless signal; A transmitter for up-converting and amplifying the signal to be transmitted, A local oscillator for generating a frequency to be supplied to the transmitter and the receiver; And a blocking unit connected between the local oscillator and the receiving end or the transmitting end to block a signal of the transmitting end from being induced to the receiving end. The method of claim 3, wherein the blocking unit, Device characterized in that it is a low pass filter or a high pass filter or isolator.