KR19980026710A - Dual band mobile communication terminal - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual-band mobile communication terminal, and more particularly, to an apparatus in which an IF (intermediate frequency) terminal of a mobile communication terminal block is configured as an RF (radio frequency) terminal to enable a small weight and low power consumption.

Description

Dual band mobile communication terminal

1 is a block diagram of a conventional single-band mobile communication terminal

2 is a block diagram of a conventional dual band mobile communication terminal.

3 is a block diagram of a dual band mobile communication terminal of the present invention.

* Description of Symbols for Major Symbols in Drawings *

RF: Radio Freguency LO: Local Oscimator

IF: Intermediate Frequnecy

RX: Receiver TX: Tronsmitter

BPF: Band Pass Filter

AMP: Amplifier

310: antenna for primary RF 320: duplexer for primary RF

330: primary RF receiver 340: IF receiver (secondary RF receiver)

350: IF transmitter (third RF transmitter) 360: primary RF transmitter

370: local oscillator 380: antenna for the second RF

390: duplexer for secondary RF

331: LNA (Low Noise Amplifier)

332: RX RF BPF (RX RX Bandpass Filter)

333: RX RF Mixer 341: RX SW (RX Switch)

342: RX IF BPF (RX IF Bandpass Filter)

343: RX IF Amp 344: RX IF Mixer

345: RX data terminal 351: TX data terminal

352: TX IF Mixer

353: TX IF BPF (TX IF Bandpass Filter)

354: TX IF Amp 355: TX SW (TX Switch)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual-band mobile communication terminal, and more particularly, to an apparatus in which an IF (intermediate frequency) terminal of a mobile communication terminal block is configured as an RF (radio frequency) terminal to enable a small weight and low power consumption.

A conventional single-band mobile communication terminal is composed of a transmission and reception antenna 110, a duplexer 120, a receiver 130, a transmitter 140, and a local oscillator 150 as shown in FIG. .

In addition, a block diagram of a conventional dual band mobile communication terminal is shown in FIG.

The dual band terminal includes a primary RF antenna 211, a primary RF duplexer 221, an IF receiver 230, an IF transmitter 240, a primary RF receiver 250, and a primary RF transmitter 260. , 2nd RF antenna 212, 2nd RF duplexer 222, 2nd RF receiver 270, 2nd transmitter 280, IF local oscillator 291, 1st RF local oscillator 292, 2 The second RF local oscillator 293 is configured.

Operation of the prior art device configured as described above is as follows.

Referring to the receiver in the conventional single-band mobile communication terminal (FIG. 1), the RF signal received through the transmit / receive antenna 110 is band-passed in the duplex 120 and then amplified by a low noise amplifier (LNA) 131. The RF signal band-filtered by the RX RF BPF 132 and the band-filtered signal by the RX IF mixer 133 and the RF LO 172 signal are mixed to form an RX IF signal. This signal is band filtered in RX IF BPF 141, amplified by RX IF Amp 142 and mixed with IF LO 171 signal to produce an RX data signal.

On the other hand, at the transmitting end, the TX data signal is mixed in the IF LO 151 signal and the TX IF mixer 152, band-filtered in the TX IF BPF 153, amplified by the TX IF Amp 154, and then the RF LO 172 signal and the TX. After mixing in the RF mixer 161 is band-filtered in the TX RF BPF (162), power-amplified in the PAM (163) and applied to the duplexer 120 and radiated into the air through the transmit and receive antenna 110.

Referring to the receiving end of the conventional dual-band mobile communication terminal of FIG. 2, RF signals in the air are received by the antennas 211 and 212. If the RF signal is a primary RF signal, the RF receiver 250 performs frequency conversion like the single band RF receiver (130 in FIG. 1) and the IF receiver 230 is frequency converted like the single IF receiver (190 in FIG. 1). To generate RX data.

In this case, referring to the transmitter, the TX data signal is transformed into IF frequency like the single-band IF transmitter (150 in FIG. 1) and RF-frequency-converted in the primary RF transmitter 260 as the single-band RF transmitter (160 in FIG. 1). The filter is filtered by the primary RF duplexer 221 and radiated into the air through the primary RF antenna 211.

When the RF signal is a secondary RF signal, the signal received by the secondary RF antenna 212 is largely filtered by the secondary duplexer 222, is frequency-converted by the secondary RF receiver 270, and is then converted by the IF receiver 230. Frequency transformed to generate RX data.

In this case, referring to the transmitter, the TX data signal is frequency-converted by the IF transmitter 240, frequency-converted by the secondary RF transmitter 280, filtered by the secondary RF duplexer 222, and then, through the secondary RF antenna 212. Radiated into the air.

As a problem of the prior art constructed and operated as described above, the conventional single band mobile communication terminal of FIG. 1 uses only one frequency band.

In the conventional dual band mobile communication terminal of FIG. 2, two frequency bands may be used, but there are problems in that a primary RF receiver, a transmitter, a secondary RF receiver, and a transmitter are required.

Accordingly, the present invention allows dual band frequencies to be used in a single band terminal structure in view of the above problems, and will be described in detail with reference to the accompanying drawings.

A block diagram of a dual band mobile communication terminal of the present invention is shown in FIG.

The terminal includes a primary RF antenna 130, a primary RF duplexer 320, an RF receiver 360 and a secondary RF duplexer 390, a secondary RF antenna 380, and an LO unit 370. Consists of.

The RF receiver 330 is composed of a LAN 331, an RX RF BDF 332, and an RX RF mixer 333, and the IF receiver 340 is an RX SW 341, an RX IF BPF 342, and an RX. IF Amp 343, RX IF mixer 344, and RX data terminal 345.

In addition, the IF transmitter 350 includes a TX data terminal 351, a TX IF mixer 352, a TX IF BPF 353, a TX IF Amp 354, and a TX SW 355. The TX transmitter has a TX SF mixer. 361, TX RF BPF 362, and PAM 363. FIG.

In FIG. 3, the first RF signal among the dual bands is as follows.

First, in case of reception, the primary RF signal in the air is received by the primary RF transmit / receive antenna 310, band-filtered by the primary RF duplexer 320, and low noise amplified by the low noise amplifier (LAN) 331. RX RF bandpass filter (RX RF BDF, 332) is band-filtered. This RF signal is mixed in the RF local oscillator (RF LO, 372) and the RX RF mixer (RX RF mixer 333) so that the RX IF signal is passed through the RX switch (RX SW 341) to the RX IF bandpass filter (RX IF BDF, 342 is amplified and amplified by an RX IF amplifier 343. This signal is mixed in an IF local oscillator (IF LO) 371 signal and an RX IF mixer (RX IF mixer, 344) to produce an RX data (RX data) signal.

In the case of the transmission of the primary RF signal, TX data (TX data) is mixed in the IF local oscillator (IF LO, 371) signal and the TX IF mixer (TX IF mixer, 352), and the TX IF bandpass filter (TX IF BPF, 353), it is band-filtered and amplified by the TX IF amplifier 354 and applied to the TX switch TX SW 355. The TX IF signal is mixed with the RF local oscillator (RF LO) 372 signal and the TX RF mixer (TX RF mixer 361) to become an RF signal. The RF signal is band filtered by the TX RF BPF (362), power amplified by the power amplifier (PAM) 363, and filtered by the duplexer 320 for the primary RF to transmit and receive the primary signal. Radiated into the air through the antenna 310.

That is, the transmission and reception of the primary RF signal is the same as the conventional structure except for the RX SW 314 and the TX SW 355.

Referring to the case of the secondary RF of the dual band, in case of reception, when the secondary RF signal is received through the antenna 380 for the secondary RF, the secondary RF duplexer 390 is band-filtered.

This signal is directly connected to the RX SW 341 and frequency transformed at the IF receiving end 340 to generate RX data.

In addition, in the case of transmission, TX data is frequency-converted by the TX transmitter 350, filtered by the secondary RF duplexer 390 via the TX SW 355, and radiated into the air through the secondary RF antenna 380.

That is, the frequency of the IF signal detects and transmits and receives the frequency of the secondary RF signal.

The effect of the present invention configured as described above is the same as the dual band terminal of the present invention. Small size, light weight and low power consumption.

In another embodiment of the present invention, a dual band terminal can be used in two bands (e.g., 800 MHz cellular and 1800 MHz PCS) in the first public network, the second primary RF is connected to the public network, and the secondary RF is connected to the real or home radiotelephone. Can be accessed.

Claims (3)

In a dual band terminal, Dual-band terminal using primary RF for RF transmitter and receiver and secondary RF for IF transmitter and receiver. The method of claim 1, A dual band terminal capable of connecting the primary RF to the public network and the secondary RF to a fixed device of a private network or a home radiotelephone. The method of claim 1, Dual-band terminal, characterized in that the procedure of the primary, secondary RF signal using an RF switch.