KR20010011831A - Pcs/imt public use terminal using together simple if part - Google Patents

Abstract

PURPOSE: A personal communication service(PCS)/international mobile telecommunications(IMT) 2000 shared terminal sharing a single intermediate frequency(IF) terminal is provided to form a mixer and a single transceiving IF processor generating a PCS/IMT 2000 shared IF by the PCS/IMT 2000 shared terminal, so as to reduce component numbers and a designing time, and to minimize a terminal. The PCS/IMT 2000 shared terminal is provided to perform a switching by a modem, so as to selectively use bandwidths of an intermediate frequency(IF) signal of a transceived IMT 2000. CONSTITUTION: An antenna(100) transceives an international mobile telecommunications(IMT) 2000 or a personal communication service(PCS) transceiving radio frequency(RF) signal. A mode selecting switch(200) selects an IMT2000 mode or a PCS mode by a modem control. A first band separator(300) separates bands of IMT2000 radio frequency(RF) signals transceived through the antenna(100). A second band separator(310) separates bands of PCS RF signals transceived through the antenna(100). A receiving circuit terminal(RC) filters/amplifies down-PCS/IMT 2000 RF signals received from the first and the second band separator(300,310), and converts the down-PCS/IMT 2000 RF signals into down-PCS/IMT 2000 shared intermediate frequency(IF) signals. A transmitting circuit terminal(TC) generates/filters up-PCS/IMT 2000 shared IF signals, and converts the up-PCS/IMT 2000 shared IF signals into up-PCS RF signals or up-IMT 2000 RF signals to perform signal processes, then inputs the processed signals to the first and the second band separator(300,310).

Description

PCS / IMT 2000 common terminal sharing a single intermediate frequency terminal {PCS / IMT PUBLIC USE TERMINAL USING TOGETHER SIMPLE IF PART}

The present invention relates to a PCS and IMT 2000 common terminal, and more particularly, to a PCS / IMT 2000 common terminal sharing a single intermediate frequency terminal using the PCS and IMT 2000 common intermediate frequency terminals in the terminal of the terminal will be.

In general, PCS (PERSONAL COMMUNICATION SERVICE) refers to a pedestrian-oriented mobile mobile communication service that can be used within a radius of 1 km within a service area by wirelessly activating a part of a locally fixed subscriber line. In addition, IMT (INTERNATIONAL MOBILE TELECOMMUNICATIONS; hereinafter referred to as IMT) 2000 system is a third generation wireless communication system, signaling message, MAC (MEDIA ACCESS CONTOL; hereinafter referred to as MAC) message and short circuit through a common channel. Burst data (hereinafter, referred to as short burst data) may be transmitted.

The conventional PCS / IMT 2000 common terminal using the PCS and IMT 2000 in common, the antenna 100 for transmitting and receiving the IMT 2000 or PCS transmit / receive RF signal as shown in Figure 1; A mode selection switch 200 controlled by a modem to select the IMT 2000 mode or the PCS mode; A first band separator 300 separating the band of the IMT 2000 RF signal transmitted / received through the antenna 100; A second band separator 310 for separating a band of the PCS RF signal transmitted / received through the antenna 100; Filter and amplify the downlink PCS and IMT 2000 RF signals individually received from the first and second band separators 300 and 310, and convert the downlink PCS and downlink IMT 2000 intermediate frequencies into signals having a predetermined bandwidth. A receiving circuit stage (A) for signal processing after conversion; After generating and filtering the signal-processed uplink PCS and IMT 2000 intermediate frequency signals separately, converting the signal to the uplink PCS RF signal and uplink IMT 2000 RF signal, and processing the signal, the first or second band separator is processed. It consists of the transmission circuit stages B which input to each.

The receiving circuit stage A includes: a first receiving RF processor 420 for filtering and amplifying a downlink PCS RF signal received through the second band separator 310 to a predetermined level; A second received RF processor 430 for filtering and amplifying the downlink IMT 2000 RF signal received through the first band separator 300 to a predetermined level; A mixer (52) for receiving a downlink PCS RF signal from the first receiving RF processor (420) and converting the downlink PCS to an intermediate frequency; A mixer (53) for receiving a downlink IMT 2000 RF signal from the second receiving RF processor (430) and converting the downlink IMT 2000 intermediate frequency; A first reception band pass filter 72 which receives a downlink PCS intermediate frequency signal from the mixer 52 and passes a frequency signal having a predetermined bandwidth; A second reception bandpass filter (73) for receiving a downlink IMT 2000 intermediate frequency signal from the mixer (53) and passing a frequency signal having a predetermined bandwidth; The PCS receiving IF processor 92 and the second receiving band pass filter 73 receiving a downlink PCS intermediate frequency signal having a predetermined bandwidth from the first receiving band pass filter 72 and processing the signal, A receiving IF processor 93 for receiving an IMT 2000 intermediate frequency signal and receiving the signal is configured.

On the other hand, the transmitting circuit stage (B) includes a PCS transmission IF processor 91 for generating an uplink PCS intermediate frequency signal to be transmitted; A transmission IF processor (90) for IMT 2000 for generating an intermediate frequency signal for uplink IMT 2000 to be transmitted; A second transmission bandpass filter (71) for receiving an uplink PCS intermediate frequency signal from the PCS transmission IF processor (91) and passing a frequency signal having a predetermined bandwidth; A first transmission bandpass filter (70) for receiving an upward IMT 2000 intermediate frequency signal from the IMT 2000 transmission IF processor (90) and passing a frequency signal having a predetermined bandwidth; A mixer (50) for receiving an uplink IMT 2000 intermediate frequency signal having a predetermined bandwidth from the first transmission bandpass filter (70) and converting it into an uplink IMT 2000 RF signal; A mixer (51) for receiving an uplink PCS intermediate frequency signal having a predetermined bandwidth from the second transmission bandpass filter (71) and converting it into an uplink PCS RF signal; A first transmission RF processor 400 for receiving an uplink IMT 2000 RF signal from the mixer 50, filtering and amplifying the RF signal, and outputting the filtered IMT 2000 RF signal to the first band separator 3000; The mixer 51 is configured with a second transmit RF processor 410 which receives the uplink PCS RF signal, filters and amplifies the output signal to the second band separator 310.

However, the conventional PCS / IMT 2000 common terminal uses the PCS transmission and reception IF processing units 91 and 92 and the IMT 2000 transmission and reception IF processing units 90 and 93 to the transmission and reception circuit terminals B and A, respectively. Since it is configured separately, the number of parts increases and the volume of the terminal increases, and at the same time, it takes a lot of design time.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to reduce the volume of the terminal and at the same time the PCS / IMT 2000 common terminal sharing a single intermediate frequency terminal that can reduce the design time To provide.

The PCS / IMT 2000 common terminal sharing a single intermediate frequency terminal according to the present invention is an antenna that transmits / receives an IMT 2000 or PCS transmit / receive RF signal, and is controlled by a modem to select an IMT 2000 mode or a PCS mode. A selection switch, a first band separator for separating a band of an IMT 2000 RF signal transmitted / received through the antenna, a second band separator for separating a band of a PCS RF signal transmitted / received through the antenna, and a modem PCS or IMT 2000 mode is controlled by the receiving circuit for filtering and amplifying the downlink PCS / IMT 2000 RF signal received from the first or second band separator, and converts the downlink PCS / IMT 2000 common intermediate frequency signal for processing However, the PCS or IMT 2000 mode is controlled by the modem to generate and filter the signal-processed uplink PCS / IMT 2000 common intermediate frequency signal, and uplink PCS RF signal or uplink IMT 2000 RF. After converting the processed signals to the arcs, it is characterized by being a single transmission circuit for inputting the processed signal to either the first or the second band splitter.

1 is a detailed circuit diagram of a PCS / IMT 2000 common terminal according to the prior art,

2 is a detailed circuit diagram of a PCS / IMT 2000 common terminal sharing a single intermediate frequency terminal according to an embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

100: antenna 200: mode selection switch

300: first band separator 310: second band separator

400: first transmit RF processor 410: second transmit RF processor

420: First receiving RF processing unit 430: Second receiving RF processing unit

500: first mixer 510: second mixer

520: third mixer 530: fourth mixer

600: first switch 610: third switch

700: first band pass filter 710: second band pass filter

720: third band pass filter 730: fourth band pass filter

800: second switch 810: fourth switch

900: transmission IF processing unit 910: reception IF processing unit

RC: Receive Circuit Stage TC: Transmit Circuit Stage

Hereinafter, a PCS / IMT 2000 common terminal sharing a single intermediate frequency terminal according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a detailed circuit diagram of a PCS / IMT 2000 common terminal sharing a single intermediate frequency terminal according to an embodiment of the present invention, PCS / IMT 2000 common terminal sharing a single intermediate frequency terminal according to an embodiment of the present invention Is composed of an antenna 100, a mode selection switch 200, first and second band separators 300 and 310, a receiving circuit stage RC, and a transmitting circuit stage TC.

The antenna 100 serves to transmit / receive an IMT 2000 or PCS transmit / receive RF signal, and the mode selection switch 200 is controlled by a modem to select an IMT 2000 mode or a PCS mode.

The first band separator 300 serves to separate a band of the IMT 2000 RF signal transmitted / received through the antenna 100, and the second band separator 310 transmits through the antenna 100. It separates the band of PCS RF signal to be received.

The receiving circuit stage RC controls the PCS or IMT 2000 mode by a modem to filter and amplify the downlink PCS / IMT 2000 RF signal received from the first band separator 300 or the second band separator 310. It converts the downlink PCS / IMT 2000 common intermediate frequency signal and performs signal processing.

In addition, the receiving circuit stage RC filters the downlink PCS RF signal received through the second band separator 310 to amplify to a predetermined level by the first receiving RF processor 420 and the first band separator 300. A second received RF processor 430 for filtering and amplifying the downlink IMT 2000 RF signal received through a predetermined level to a predetermined level, and receiving the downlink PCS RF signal from the first received RF processor 420 to share the downlink PCS / IMT 2000; A third mixer 520 converting the intermediate frequency signal, a fourth mixer 530 receiving the downlink IMT 2000 RF signal from the second receiving RF processor 430 and converting the downlink PCS / IMT 2000 common intermediate frequency signal; A third band pass filter 720 and a fourth mixer (420) for receiving a downlink PCS / IMT 2000 common intermediate frequency signal from the third mixer 520 or the fourth mixer 530 and passing a frequency signal having a 1.25 MHz bandwidth; PCS / IMT 2000 common intermediate frequency downlink from 530 Inputs a down band intermediate frequency signal of a predetermined band from the fourth band pass filter 730 and the third band pass filter 720 or the fourth band pass filter 730 to pass a 5 MHz bandwidth frequency signal; Receiving IF processing unit 910 for receiving and processing the signal, the switching operation by the modem so that the downlink PCS / IMT 2000 common intermediate frequency signal from the third mixer 520 or the fourth mixer 530 is the third band pass filter ( 720 is switched by the third switch 610 and the modem to control the input to the fourth band pass filter 730 from the third band pass filter 720 or the fourth band pass filter 730 The fourth switch 810 is configured to selectively output a downlink PCS / IMT 2000 common intermediate frequency signal having a predetermined bandwidth to the receiving IF processor 910.

The transmitting circuit stage TC controls the PCS or IMT 2000 mode by a modem to generate and filter the signal-processed uplink PCS / IMT 2000 common intermediate frequency signal, and converts it to uplink PCS RF signal or uplink IMT 2000 RF signal. After signal processing, the processed signal is input to the first band separator 300 or the second band separator 310.

In addition, the transmitting circuit stage TC transmits an uplink PCS / IMT 2000 common intermediate frequency signal to the uplink PCS / IMT 2000 common intermediate frequency signal to be transmitted, and the uplink PCS / IMT 2000 common intermediate frequency signal from the transmitting IF processor 900. A first band pass filter 700 for receiving a frequency signal having a 5 MHz bandwidth and a first frequency passing signal having a 1.25 MHz bandwidth from an uplink PCS / IMT 2000 common intermediate frequency signal received by the transmitting IF processor 900. A second band pass filter 710, the first band pass filter 700 or the second band pass filter 710 receives an uplink PCS / IMT 2000 common intermediate frequency signal of a predetermined bandwidth and converts it into an uplink IMT 2000 RF signal A first mixer 500 and a second mixer 510 for receiving an uplink PCS / IMT 2000 common intermediate frequency signal having a predetermined bandwidth from the second bandpass filter 710 and converting it into an uplink PCS RF signal; IMT 2000 RF Sin Upward From 500 A first transmit RF processor 400, a second mixer 510, an uplink PCS RF signal received from the first band RF separator 300 to filter, amplify, and amplify a call and output the filtered and amplified signal to the second band separator 300. A second transmission RF processing unit 410 outputs to the band separator 310, a switching operation by a modem, the PCS / IMT 2000 common intermediate frequency signal from the transmission IF processing unit 900 is the first band pass filter 700 Alternatively, a switching operation is performed by the second switch 800 and the modem for controlling the input to the second band pass filter 710 and the predetermined bandwidth from the first band pass filter 700 or the second band pass filter 710. The PCS / IMT 2000 common frequency signal is composed of a first switch 600 for controlling the input to the first mixer 500 or the second mixer 510.

The operation of the PCS / IMT 2000 common terminal sharing a single intermediate frequency terminal according to an embodiment of the present invention having the above configuration will be described.

The operation of the receiving circuit stage RC will be described. First, an RF signal is received through the antenna 100, and the modem determines whether the received RF signal is a PCS signal or an IMT 2000 signal, and controls the operation of the mode selection switch 200 accordingly. The first receiving RF processor 420 or the second receiving RF processor 430 receives the downlink PCS or IMT 2000 RF signal through the second band separator 310 or the first band separator 300 and filters the filter to a predetermined level. Amplify.

Subsequently, the third mixer 520 or the fourth mixer 530 receives the downlink PCS or IMT 2000 RF signal from the first receiving RF processor 420 or the second receiving RF processor 430, and receives the downlink PCS / IMT 2000. A third switch 610 is switched by a modem so that the downlink PCS / IMT 2000 common intermediate frequency signal is converted into a third band pass filter 720 or a fourth band pass filter 730. Input is limited to 1.25 or 5 MHz bandwidth.

Subsequently, the fourth switch 810 is switched by a modem so that the downlink PCS / IMT 2000 common intermediate frequency signal having a predetermined bandwidth is received from the third bandpass filter 720 or the fourth bandpass filter 730. 910 is input and signal processed.

Next, the operation of the transmitting circuit stage will be described. First, when the uplink PCS / IMT 2000 common intermediate frequency signal is generated by the transmission IF processor 900, the second switch 800 is switched by a modem to pass the uplink PCS / IMT 2000 common intermediate frequency signal to the first band pass. Input to the filter 700 or the second band pass filter 710.

Subsequently, the first bandpass filter 700 or the second bandpass filter 710 outputs an uplink PCS / IMT 2000 common intermediate frequency signal having a predetermined bandwidth, and the first switch 600 switches by the modem. Then, the uplink PCS / IMT 2000 common intermediate frequency signal having the predetermined bandwidth is input to the first mixer 500 or the second mixer 510.

Subsequently, the first mixer 500 or the second mixer 510 converts the uplink PCS / IMT 2000 common intermediate frequency signal into an uplink IMT 2000 RF signal or uplink PCS RF signal, and transmits the first transmit RF processor 400. Alternatively, the second transmission RF processor 410 amplifies the uplink IMT 2000 RF signal or the uplink PCS RF signal to a predetermined level and filters the upstream RF signal to the first band separator 300 or the second band separator 310. Outputs a signal, and the uplink RF signal is output through the antenna 100.

As described above, according to the PCS / IMT 2000 common terminal sharing a single intermediate frequency terminal according to the present invention, a mixer and a single transmitter and receiver for generating a plurality of switches, PCS / IMT 2000 common intermediate frequencies, respectively, in the transmitting and receiving circuit terminals. By placing the IF processing unit, the number of parts can be reduced, so that the terminal can be miniaturized and the design time can be shortened.

Another effect is that the bandwidth of the intermediate frequency signal of the IMT 2000, which is switched and transmitted by the modem, can be selectively used.

Claims (3)

An antenna for transmitting / receiving an IMT 2000 or PCS RF signal, A mode selection switch controlled by a modem to select IMT 2000 mode or PCS mode; A first band separator for separating a band of the IMT 2000 RF signal transmitted / received through the antenna; A second band separator for separating a band of the PCS RF signal transmitted / received through the antenna; A PCS or IMT 2000 mode is controlled by a modem to filter and amplify the downlink PCS / IMT 2000 RF signal received from the first or second band splitter, convert the downlink PCS / IMT 2000 common intermediate frequency signal, and process the received signal. Circuitry, The PCS or IMT 2000 mode is controlled by a modem to generate and filter a signaled uplink PCS / IMT 2000 common intermediate frequency signal, convert the signal to an uplink PCS RF signal or uplink IMT 2000 RF signal, and then process the signal. PCS / IMT 2000 common terminal sharing a single intermediate frequency terminal, characterized in that consisting of a transmitting circuit terminal for inputting a signal to the first or second band separator. The method of claim 1, The receiving circuit stage includes a first receiving RF processor for filtering and amplifying a downlink PCS RF signal received through the second band separator to a predetermined level; A second receiving RF processor for filtering and amplifying a downlink IMT 2000 RF signal received through the first band separator to a predetermined level; A third mixer for receiving a downlink PCS RF signal from the first receiving RF processor and converting the downlink PCS / IMT 2000 common frequency signal; A fourth mixer for receiving the downlink IMT 2000 RF signal from the second receiving RF processor and converting the downlink PCS / IMT 2000 common intermediate frequency signal; A third band pass filter which receives a downlink PCS / IMT 2000 common intermediate frequency signal from the third mixer or the fourth mixer and passes a frequency signal having a bandwidth of 1.25 MHz; A fourth band pass filter which receives a downlink PCS / IMT 2000 common intermediate frequency signal from the fourth mixer and passes a frequency signal having a 5 MHz bandwidth; A receiving IF processor which receives a downlink intermediate frequency signal of a predetermined band from the third or fourth bandpass filter and processes the signal; A third switch for switching by a modem to control input of the downlink PCS / IMT 2000 common intermediate frequency signal from the third or fourth mixer into the third or fourth bandpass filter; And a fourth switch configured to switch by a modem to selectively output a downlink PCS / IMT 2000 common intermediate frequency signal having a predetermined bandwidth from the third or fourth bandpass filter to the receiving IF processor. PCS / IMT 2000 common terminal with frequency sharing. The method of claim 1, The transmitting circuit stage includes a transmission IF processor for generating an uplink PCS / IMT 2000 common intermediate frequency signal to be transmitted; A first band pass filter which receives an uplink PCS / IMT 2000 common intermediate frequency signal from the transmitting IF processor and passes a frequency signal having a 5 MHz bandwidth; A second band pass filter which receives an uplink PCS / IMT 2000 common intermediate frequency signal from the transmitting IF processor and passes a frequency signal having a bandwidth of 1.25 MHz; A first mixer which receives an uplink PCS / IMT 2000 common intermediate frequency signal having a predetermined bandwidth from the first or second bandpass filter and converts it into an uplink IMT 2000 RF signal; A second mixer which receives an uplink PCS / IMT 2000 common intermediate frequency signal having a predetermined bandwidth from the second bandpass filter and converts it into an uplink PCS RF signal; A first transmission RF processor for receiving an IMT 2000 RF signal received from the first mixer, filtering and amplifying the RF signal, and outputting the filtered IMT 2000 RF signal to the first band separator; A second transmission RF processor for receiving an uplink PCS RF signal from the second mixer, filtering and amplifying the output signal to the second band separator; A second switch for switching by a modem to control input of the PCS / IMT 2000 common intermediate frequency signal from the transmission IF processor to the first or second band pass filter; And a first switch which switches by a modem to control input of the PCS / IMT 2000 common frequency signal having a predetermined bandwidth from the first or second band pass filter to the first or second mixer. PCS / IMT 2000 common terminal sharing a single intermediate frequency terminal.