KR20010079010A - Apparatus for transmitting and receiving triple band RF for the GSM handset - Google Patents

Abstract

PURPOSE: A triple band radio frequency transceiver for GSM(Global System for Mobile) handsets is provided to design and manufacture a triple band terminal using an inexpensive dual band chip for GSM handsets. CONSTITUTION: A triple band radio frequency transceiver for GSM(Global system for Mobile) handsets consists of a BBA(Base Band Analog) output unit(100), a loop filter(110), the first dual oscillator(120), the first PCS oscillator(130), a combiner(140), a power amplifier(150), a coupler(160), a power amplification controller(170), a transceiver(180), the first RF switch(190), a PCS filter(200), a DCS filter(210), the second RF switch(220), a GSM filter(230), a linear amplifier/mixer(240), the second dual oscillator(250), the second PCS oscillator(260), a dual PLL(270), a resonator(280), an IF transceiver(290), and an IF filter(300). The loop filter(110) filters the IF signal outputted from the IF transceiver(290) and splits it into a GSM band and a DCS band. The first dual oscillator(120) generates the local signals of the separated GSM and DCS bands. The first PCS oscillator(130) receives a control signal from the BBA output unit(100) and generates a PCS band local signal. The combiner(140) combines the GSM band transmitted from the first dual oscillator(120) with a TX frequency. The power amplifier(150) amplifies the output signal transmitted from the combiner(140) and the signals respectively outputted from the first dual oscillator(120) and the first PCS oscillator(130). The power amplification controller(170), receiving a VAPC(VoltAge Power Controller) signal from the BBA output unit(100) and a coupling signal from the coupler(160), controls the power-amplified signal of the power amplifier(150). The transceiver(180) transmits and receives various signals amplified at the power amplifier(150) according to the control of the power amplification controller(170).

Description

Triple band high frequency transceiver for gsm handset {Apparatus for transmitting and receiving triple band RF for the GSM handset}

The present invention relates to a triple band high frequency transceiver for a GSM (Global System for Mobile) handset, and more particularly, to provide a triple band terminal required by a world wide distributor due to the global characteristics of GSM. The present invention relates to a triple band high frequency transceiver for a GSM handset for designing and manufacturing a triple band terminal using a dual band chip.

In general, a mobile communication terminal is classified into a dual band terminal and a triple band terminal. A dual band terminal refers to a mobile communication terminal that can receive a predetermined service by mutually joining a plurality of mobile communication systems having different service frequency bands. There are mobile terminals capable of receiving both CDMA (Code Division Multiple Access) and PCS (Personal Communication System) services, or mobile terminals capable of receiving GSM and DECT (Digital European Cordless Telephone) services. . Such dual band terminals can be used worldwide, but not in North America using PCS. In addition, the PCS band of the triple band handset is used in North America or the United States. Recently, due to the global characteristics of GSM, it has become a preferred object due to the requirements of the world wide distributors. This is actually a difficult situation.

Accordingly, the present invention is to solve such a problem, the present invention is a triple band high-frequency transmission and reception for a GSM handset for designing and manufacturing a triple-band terminal using a dual-band chip for a low-cost GSM handset The purpose is to provide a device.

1 is a block diagram of a triple band high frequency transceiver for a GSM handset.

<Explanation of symbols for the main parts of the drawings>

100: BBA output means 110: loop filter means

120: first dual oscillation means 130: first PCS oscillation means

140: combiner means 150: power amplification means

160: coupler means 170: power amplification controller means

180: transmission and reception means 190: first high frequency switching means

200: PCS filtering means 210: DCS filtering means

220: second high frequency switching means 230: GSM filtering means

240: linear amplification and mixer means 250: second dual oscillation means

260: second PCS oscillation means 270: dual PLL means

280: resonance means 290: IF transceiver means

300: IF filter means

Features of the present invention for achieving the above object, Loop filter means for filtering the IF frequency output from the IF transceiver means connected to the BBA output means to separate the GSM band and the DCS band; First dual oscillating means for generating local signals of the GSM band and the DCS band separated from the loop filter means; First PCS oscillating means for inputting the control signal transmitted from said BBA output means to generate a local signal of a PCS band; Combiner means for combining the GSM band transmitted from the first dual oscillation means into a TX frequency; Power amplifying means for amplifying an output signal transmitted from said combiner means and a signal output from each of said first dual oscillation means and said PCS oscillation means; Power amplification controller means for receiving the VAPC signal transmitted from the BBA output means and the coupling signal output from the coupler means connected to the antenna and controlling the signal amplified by the power amplification means; Transmission and reception means for transmitting various signals of the power amplification means amplified under the control of the power amplification controller means; First high frequency switching means for switching various high frequency signals transmitted from the transmitting and receiving means; PCS filtering means for filtering the PCS signal of the various high-frequency signals switched by the first high frequency switching means; DCS filtering means for filtering the DCS signal of the various high frequency signals switched by the high frequency switching means; Second high frequency switching means for switching signals output from the PCS filtering means and the DCS filtering means, respectively; GSM filtering means for filtering the GSM signal transmitted from the transmitting and receiving means; Linear amplification and mixer means for amplifying and mixing the signal switched by the second high frequency switching means and the signal filtered by the GSM filtering means; Second dual oscillating means for generating local signals of the GSM band and the DCS band separated by the linear amplification and mixer means in association with the dual PLL means; Second PCS oscillating means for generating a local signal of said PCS band in accordance with a control signal of said BBA output means; And resonating means for receiving and resonating the PLL signal transmitted from the dual PLL means to output the IF transceiver means.

Preferably, the PCS filtering means is characterized in that the PCS SAW filter.

Preferably, the DCS filtering means is a DCS SAW filter.

Preferably, the first high frequency switching means and the second high frequency switching means are controlled by the BBA output means.

Preferably, the GSM filtering means is a GSM SAW filter.

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

1 is a block diagram of a triple band high frequency transmission and reception apparatus for a GSM handset.

1, the present invention provides a base band analog (BBA) output means 100, a loop filter means 110, a first dual oscillation means 120, a first PCS oscillation means 130. Combiner means 140, power amplification means 150, coupler (Coupler) means 160, power amplification controller means 170, transmission and reception means 180, the first high frequency switching means 190 , PCS filtering means 200, DCS filtering means 210, second high frequency switching means 220, GSM filtering means 230, linear amplification and mixer means 240, second dual oscillation means 250, 2PCS oscillation means 260, dual PLL means 270, resonating means 280, IF transceiver means 290, IF filter means 300.

The loop filter means 110 filters the IF frequency output from the IF transceiver means connected to the BBA output means 100 to separate the GSM band and the DCS band, and the first dual oscillation means 120 is the loop filter means 110. Generates local signals of the separated GSM band and the DCS band. The first PCS oscillating means 130 inputs a control signal transmitted from the BBA output means 100 to generate a local signal of the PCS band, and the combiner means 140 is transmitted from the first dual oscillating means 120. Combine GSM bands with TX frequency.

The power amplifying means 150 amplifies the output signal transmitted from the combiner means 140 and the signals output from the first dual oscillating means 120 and the PCS oscillating means 130, respectively, and the power amplifying controller means 170 ) Receives a VAPC signal from the BBA output means 100 and a coupling signal output from the coupler means 160 connected to the antenna ANT to receive a power amplified signal from the power amplification means 150. To control. Transmitting and receiving means 180 is composed of a diplexer and two transceivers for transmitting and receiving various signals of the power amplifying means 150 amplified under the control of the power amplification controller means 170, the first high frequency switching The means 190 switches various high frequency signals transmitted from the transceiver of the transmitting and receiving means 180 under the control of the BBA output means 100.

PCS filtering means 200 is composed of a PCS SAW filter to filter the PCS signal of the various high-frequency signals switched by the first high frequency switching means 190, DCS filtering means 210 is composed of a DCS SAW filter and the first high frequency The DCS signal of the various high frequency signals switched by the switching means 190 is filtered. The second high frequency switching means 220 switches the signals output from the PCS filtering means 200 and the DCS filtering means 210 under the control of the BBA output means 100, and the GSM filtering means 230 is the GSM SAW filter. It is configured to filter the GSM signal transmitted from the transceiver of the transmitting and receiving means (180).

Meanwhile, the linear amplification and mixer means 240 amplifies and mixes the signal switched by the second high frequency switching means 220 and the signal filtered by the GSM filtering means and passes through the IF filter means 300 to the IF transceiver means 290. The second dual oscillation means 250 generates a local signal of the GSM band and the DCS band separated by the linear amplification and mixer means 240 in conjunction with the dual PLL means 270. The second PCS oscillating means 260 generates a local signal of the PCS band according to the control signal of the BBA output means 100, and the resonating means 280 receives the PLL signal transmitted from the dual PLL means 270 and resonates the IF. Output to the transceiver means 290.

In more detail, the IF signal output from the IF transceiver means 290 is divided into a GSM band and a DCS band by removing a noise component through the loop filter means 110, and the GSM band is the first dual oscillation means 120. It is input to the combiner means 140 via). The GSM band input to the combiner means 140 is combined with the TX frequency by mixing the corresponding local signal and the IF signal passed through the loop filter means 110, so that the power amplification means 150 transmits the TX frequency. The necessary power is amplified. In addition, the DCS band is mixed (Mix) by the TX frequency from the combiner means 140 via the first dual oscillation means 120 is input to the power amplification means 150 to amplify the power.

If the PCS band is similar in frequency band to the DCS band, the DCS band output from the loop filter means 110 is the IF frequency output from the IF transceiver means 290 is the DCS line of the first dual oscillation means 120. Through meeting the output of the PCS oscillation means 130 to form a TX frequency. At this time, the first dual oscillation means 120 and the PCS oscillation means 130 of the DCS line are switched to the BBA control signal transmitted from the BBA output means 100.

The TX signal amplified by the power amplification means 150 is radiated to the antenna ANT through the coupler means 160 by removing the unnecessary frequency through the deplexer of the transmission and reception means 180, the power amplification controller means 170 The BBA output means 100 receives the VAPC signal and performs power amplification control. The coupler means 160 feeds back the magnitude of the TX signal radiated to the antenna ANT to the power amplification controller means 170, and if the TX signal is small, the power amplification controller means 170 causes the power amplification means. Control 150 to allow greater power amplification.

On the other hand, when a received signal is introduced through the antenna ANT is divided into a GSM band, a DCS band and a PCS band through the deplexer of the transmission and reception means 180, respectively, the GSM filtering means 230 and the first high frequency switching means 190. The DCS filtering means 210 and the PCS filtering means 200 connected to each other are filtered. At this time, the signal passing through the GSM filtering means 230 is amplified and mixed in the linear amplification and mixer means 240 is input to the IF filter means (300).

The DCS signal and the PCS signal passing through the deflector of the transmission / reception means 180 pass through the first high frequency switching means 190. The first high frequency switching means 190 and the second high frequency switching means 220 are BBAs. Receives the BBA signal which is the control signal of the output means 100 and switches the DCS signal, PCS signal is separated. The BBA signal is controlled in conjunction with the network signal in the phone (not shown), so that the PCS network is caught and transmitted to the PCS filtering means 200. The signal passing through the PCS filtering means 200 and the DCS filtering means 210 is amplified into a signal large enough to detect the signal via the linear amplification and mixer means 240. The signal amplified by the linear amplification and mixer means 240 is mixed with the local signal of each band oscillated by the second dual oscillation means 250 and the second PCS oscillation means 260 and converted into a high frequency IF signal. The second dual oscillation means 250 generates local signals of the GSM band and the DCS band in conjunction with the dual PLL means 270, and the second PCS oscillating means 260 generates the PCS local signals, respectively, for linear amplification and mixer means. Transmit to 240. At this time, the dual PLL means 270 receives the channel information from the IF transceiver means 290 to generate a local signal for the channel from the second dual oscillation means 250, the second PCS oscillation means 260.

The signal converted to the high frequency IF by the linear amplification and mixer means 240 is transmitted to the IF transceiver means 290 by removing the noise component from the IF filter means 300. The IF transceiver means 290 generates a TX IF. Sending to the TX stage, and also receives the RX IF detects information such as an audio signal with the BBA output means (100).

As described above, 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 by the claims below and equivalents thereof.

As a result, according to the triple-band high-frequency transceiver for GSM handsets according to the present invention the following advantages occur.

That is, a triple band terminal can be manufactured at a low manufacturing cost using a dual band chip, thereby having a price competitiveness.

Claims (5)

Loop filter means for filtering the IF frequency output from the IF transceiver means connected to the BBA output means to separate the GSM band and the DCS band; First dual oscillating means for generating local signals of the GSM band and the DCS band separated from the loop filter means; First PCS oscillating means for inputting the control signal transmitted from said BBA output means to generate a local signal of a PCS band; Combiner means for combining the GSM band transmitted from the first dual oscillation means into a TX frequency; Power amplifying means for amplifying an output signal transmitted from said combiner means and a signal output from each of said first dual oscillation means and said PCS oscillation means; Power amplification controller means for receiving the VAPC signal transmitted from the BBA output means and the coupling signal output from the coupler means connected to the antenna and controlling the signal amplified by the power amplification means; Transmission and reception means for transmitting various signals of the power amplification means amplified under the control of the power amplification controller means; First high frequency switching means for switching various high frequency signals transmitted from the transmitting and receiving means; PCS filtering means for filtering the PCS signal of the various high-frequency signals switched by the first high frequency switching means; DCS filtering means for filtering the DCS signal of the various high frequency signals switched by the high frequency switching means; Second high frequency switching means for switching signals output from the PCS filtering means and the DCS filtering means, respectively; GSM filtering means for filtering the GSM signal transmitted from the transmitting and receiving means; Linear amplification and mixer means for amplifying and mixing the signal switched by the second high frequency switching means and the signal filtered by the GSM filtering means; Second dual oscillating means for generating local signals of the GSM band and the DCS band separated by the linear amplification and mixer means in association with the dual PLL means; Second PCS oscillating means for generating a local signal of said PCS band in accordance with a control signal of said BBA output means; And And a resonator means for receiving and resonating the PLL signal transmitted from the dual PLL means to output the IF transceiver means. The method of claim 1, wherein the PCS filtering means Triple band high frequency transceiver for GSM handset characterized by a PCS SAW filter. The method of claim 1, wherein the DCS filtering means Triple band high frequency transceiver for GSM handsets characterized by a DCS SAW filter. The method of claim 1, And said first high frequency switching means and said second high frequency switching means are controlled by said BBA output means. The method of claim 1, wherein the GSM filtering means Triple band high frequency transceiver for GSM handset characterized by a GSM SAW filter.