KR100672344B1 - Multi-Carrier receiving device for mobile terminal - Google Patents

Abstract

According to the present invention, when a frequency down processing of a high frequency / middle frequency signal into a baseband signal is performed at a receiving end of a broadband mobile terminal using a multi-carrier, it is possible to increase the frequency shift of the phase-locked loop to speed up system acquisition. A multicarrier receiving apparatus of a terminal. Such a multicarrier receiver of a broadband mobile terminal is a portable terminal having a plurality of high frequency / medium frequency local oscillators, and feeds back a plurality of high frequency / medium frequency local signals to the frequencies of the high frequency / medium frequency local signals and the portable terminal. A plurality of high frequency / medium frequency phase locked loops for comparing the reference frequencies and outputting the comparison results as pulse signals, and a plurality of pieces of pulse signals output from the respective high frequency / medium frequency phase locked loops are converted into DC voltages and outputted. Loop filters and a plurality of high frequency / medium frequency voltage control oscillators for generating corresponding high frequency / medium frequency local signals according to the DC voltages output from the plurality of loop filters. Therefore, since the frequency shift can be made quickly during hard handoff, the system acquisition can be accelerated to smoothly provide a communication service.

Phase locked loop, broadband portable terminal

Description

Multi-Carrier receiving device for mobile terminal

1 is a block diagram showing a part of the configuration of the receiver receiving terminal according to the prior art

Figure 2 is a block diagram showing a part of the configuration of the receiving end of the broadband portable terminal according to the present invention

3 is a diagram illustrating an internal configuration of a high frequency / medium frequency local oscillation circuit of the broadband mobile terminal as shown in FIG.

4 is a circuit diagram of a resonant circuit according to the present invention.

* Description of the symbols for the main parts of the drawings *

10: high frequency / medium frequency processing unit 20: high frequency / medium frequency control unit

30: baseband processing unit 100: high frequency / medium frequency local oscillation unit

110: CPU 120: reference frequency oscillator

130: high frequency / medium frequency phase locked loop (RF / IF PLL)

140: loop filter

150: high frequency / medium frequency voltage controlled oscillator (RF / IF OSC)

160: high frequency / medium frequency mixer (MIXER)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-carrier receiver of a broadband mobile terminal. In particular, when a high frequency / medium frequency signal is frequency-down processed into a baseband signal in a receiver of a broadband mobile terminal using multicarrier, the frequency of a phase locked loop The present invention relates to a multi-carrier receiver of a portable terminal capable of making a fast transition and rapidly acquiring a system.

Hereinafter, a receiver of a conventional mobile terminal will be described with reference to the accompanying drawings.

1 is a block diagram showing a part of the configuration of a receiver receiving terminal according to the prior art.

Referring to FIG. 1, in a super heterodyne communication method, a radio frequency (RF) signal carried on a carrier is processed by a high frequency processor 1.

In order to process the high frequency signal output from the high frequency processor 1 on the first frequency down, the receiving end is provided with a high frequency local generator (RF Local Generator) 2.

Here, the output high frequency signal of the high frequency processor 1 and the local signal for high frequency provided by the high frequency local oscillator 2 are mixed in a high frequency mixer 3 to produce an intermediate frequency (IF) signal. The intermediate frequency processor 4 transmits the data.

The intermediate frequency signal is processed by the intermediate frequency processor 4, and the intermediate frequency signal subjected to the primary frequency down processing is subjected to the secondary frequency down processing to become a baseband signal.

In order to generate the baseband signal from the intermediate frequency signal, the receiving end is provided with an IF local generator 5 for providing a local signal for the corresponding intermediate frequency for each path.

Here, the baseband processor combines the output intermediate frequency signal of the intermediate frequency processor 4 and the local frequency signal provided by the intermediate frequency local oscillator 5 in the intermediate frequency mixer 6 to form a baseband signal. Transfer to (7).

The baseband processor 7 converts the transmitted baseband signal into a baseband signal having a phase of I and Q.

In this way, since the receiver receives only one carrier and cannot receive a multicarrier, it cannot support next-generation communication services such as IMT-2000 using a broadband mobile terminal. There was a problem that it was difficult to obtain the system quickly when off.

SUMMARY OF THE INVENTION An object of the present invention has been made in view of the above-mentioned problems of the prior art, and the frequency down processing of a high frequency / medium frequency signal into a baseband signal at a receiving end of a broadband mobile terminal using a multi carrier. The purpose of the present invention is to provide a multi-carrier receiving device of a mobile terminal capable of accelerating system transition by accelerating frequency shift. Such a multicarrier receiver of a portable terminal includes a plurality of high frequency / medium frequency local signals and a plurality of high frequency / medium frequency local signals to feed back the frequencies of the high frequency / medium frequency local signals and the portable terminals. A plurality of high frequency / medium frequency phase locked loops for comparing the reference frequencies and outputting the comparison results as pulse signals, and a plurality of high frequency / medium frequency phase locked loops for converting and outputting the pulse signals outputted from the respective high frequency / medium frequency phase locked loops. And a plurality of high frequency / medium frequency voltage control oscillators for generating a corresponding high frequency / medium frequency local signal according to a DC voltage output from the plurality of loop filters.

According to the present invention as described above, it is possible to accelerate system acquisition by accelerating the frequency shift of the multiple phase locked loop (PLL) during hard handoff.

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a block diagram illustrating some components of a receiving end of a broadband portable terminal according to the present invention.

The receiving end of the broadband mobile terminal according to the present invention is a high frequency / intermediate frequency signal output from the high frequency / intermediate frequency processing unit 10 is input to the high frequency / intermediate frequency control unit 20, the high frequency / intermediate frequency control unit 20 is a high frequency / In order to mix the high frequency / intermediate frequency signal, which is the output of the intermediate frequency processor 10, and the local signal for the high frequency / intermediate frequency corresponding to each path of the plurality of paths, a high frequency / medium frequency mixer (RF) in each path. / IF Mixer (21, 22, 23, 24), the output of the high frequency / medium frequency mixer (RE / IF Mixer) (21, 22, 23, 24) is converted into a baseband signal and the baseband processing unit It is input to 30.

Here, a high frequency / medium frequency local oscillator 100 for generating a local signal for high frequency / medium frequency necessary for mixing the high frequency / medium frequency signal into a baseband signal is provided.

The high frequency / medium frequency local oscillator 100 provides a local signal for the corresponding high frequency / medium frequency in each path as many carriers as used.

FIG. 3 is an internal configuration diagram of a high frequency / medium frequency local oscillation circuit of the broadband portable terminal as shown in FIG. 2.

The high frequency / medium frequency local oscillation circuit of the broadband portable terminal according to the present invention has a reference frequency oscillator 120 for generating a reference frequency f _r , as shown in FIG. 3, and includes first to Nth high frequency / medium frequencies. Phase locked loops (RF / IF PLL) 130, 131, 132 and 133, and a central processing unit (CPU) 110 for inputting data into the high frequency / medium frequency phase locked loops 120, 131, 132 and 133 are provided.

Also, a DC signal is output from the first to Nth high frequency / intermediate frequency phase locked loops (RF / IF PLL) 130, 131, 132, and 133 by a charge pump in the form of a pulse width modulation signal. First to Nth loop filters (140, 141, 142, 143) for converting the signals, and first to Nth intermediate frequency voltage control oscillators (RF / IF) for providing localized signals for the high frequency and the intermediate frequency in each path. VCO) 150, 151, 152, 153, and 154. In this case, the DC output of the first to Nth loop filters 140, 141, 142, 143 and the first to Nth loop filters 140, 141, 142, 143 and the first to Nth intermediate frequency voltage oscillators 150, 151, 152, 153, and 154. N resonant circuits (not shown) for adjusting the resonant frequency so that the first to Nth intermediate frequency voltage controlled oscillators (RF / IF VCOs) 150, 151, 152, 153, and 154 output local signals for the desired high / intermediate frequencies. It is provided.

The detailed operation of the intermediate frequency local oscillation circuit configured as described above is as follows.

In the present invention, the outputs of the first to Nth loop filters 140, 141, 142 and 143 are respectively input to N resonant circuits (not shown) of each path, and the values of the internal elements of the resonant circuits are adjusted differently. Accordingly, the first to Nth high frequency / intermediate frequency voltages are provided to the first to Nth high frequency / intermediate frequency voltage controlled oscillators (RF / IF VCOs) 150, 151, 152, 153 and 154 in the same path. The control oscillator (RF / IF VCO) 150, 151, 152, 153, 154 may provide the first to Nth RF / IF mixers 160, 161, 162, 163, and 164 local signals for the high frequency / intermediate frequencies corresponding to the respective paths. To help.

To do this, compare the frequency (f _c ) of the signal output from the reference frequency (f _r ) and the high frequency / intermediate frequency control oscillator (RF / IF VCO), and apply a constant DC voltage to all resonant circuits from the phase difference. Be sure to

The first through the N radio frequency / intermediate frequency phase-locked loop (RF / IF PLL) (130,131,132,133) has a reference frequency input from the reference oscillator 120 by the data input (Loading) from the CPU (110) (f _r) And the frequency f _c of the signal fed back from the first to Nth high frequency / intermediate frequency voltage controlled oscillators (RF / IF VCOs) 150, 151, 152 and 153 are the same frequency. At this time, when the CPU 110 inputs data into the first to Nth high frequency / intermediate frequency phase locked loops (RF / IF PLL) 130, 131, 132, and 133, the first to Nth high frequency / intermediate frequency phase locked loops (RF / IF). PLL) (130, 131, 132, 133) of the high frequency phase locked loop (RF PLL) is first performed in parallel, and after locking to the high frequency phase locked loop (RF PLL) is completed in parallel to the intermediate frequency phase locked loop (IF PLL) Enter data secondarily.

To this end, a counter (not shown) and a phase comparator (not shown) are provided inside the first to Nth high frequency / intermediate frequency phase locked loops (RF / IF PLL) 130, 131, 132, and 133, respectively. The frequency f _c of the signal fed back from the N-th high frequency / intermediate frequency controlled oscillator (IF VCO) 151, 152, 153, 154 is divided by a counter (not shown), and then the phase and the reference frequency oscillator Phases of the reference frequency f _r output from 120 are compared with each other.

The phase difference generated at this time is output in the form of a pulse width modulation signal by a charge pump. That is, the phase difference is represented by the width of the pulses output from the first to Nth high frequency / intermediate frequency phase locked loops (RF / IF PLL) 130, 131, 132, and 133.

The first to Nth loop filters 140, 141, 142, and 143 are signals output in the form of pulse width modulation from the first to Nth high frequency / intermediate frequency locked loops (RF / IF PLL) 130, 131, 132, and 133. The DC voltage corresponding to the pulse width is output.

The signals converted into direct current from the first to Nth loop filters 140, 141, 142, and 143 are applied to the resonant circuits of the first to Nth high frequency / intermediate frequency voltage controlled oscillators (IF VCOs) 150, 151, 152, and 153. The high frequency / intermediate frequency voltage controlled oscillator (RF / IF VCO) 150, 151, 152, 153 adjusts the resonant frequency to oscillate at a desired output frequency f _c .

4 is a diagram illustrating an internal configuration of a resonant circuit used in the present invention, in which resistors R, inductors L, capacitors C1 and C2, and varactors C _V are internal elements of the resonant circuit. ), The N-carrier using N carriers oscillates N high frequency / medium frequency local signals for each carrier at the desired frequency in each high frequency / medium frequency voltage controlled oscillator (IF VCO) 150,151,152,153. Can be adjusted.

As described above, since the present invention can receive a multicarrier in a broadband mobile terminal, it is possible to speed up the frequency shift, and in particular, a plurality of high frequency phase locked loops (RF PLLs) are locked and then an intermediate frequency phase locked loop (IF PLL). Since the data is loaded (loading), it can respond quickly to frequency conversion during hard handoff or roaming, and the acquisition time of the system is shortened, thereby providing high quality call service.

Claims (3)

A plurality of high frequency and medium frequency phase locked loops; A plurality of loop filters; And a plurality of high frequency and intermediate frequency local oscillators for the portable terminal, comprising: a plurality of high frequency and intermediate frequency voltage controlled oscillators. The plurality of high frequency and intermediate frequency phase locked loops compare the frequencies of the plurality of high frequency and intermediate frequency local signals fed back from the plurality of high frequency and intermediate frequency voltage controlled oscillators with the reference frequencies of the mobile terminals and output a comparison result as a pulse signal. and, The plurality of loop filters converts the pulse signal output from the respective high frequency and intermediate frequency phase locked loops into DC voltages, and outputs them. And the plurality of high frequency and intermediate frequency voltage controlled oscillators generate the corresponding high frequency and intermediate frequency local signals according to the DC voltages output from the plurality of loop filters. The plurality of loop filters and the plurality of high frequency and intermediate frequency voltage controlled oscillators are inputted with respective series voltages of the plurality of loop filters, and the respective resonant frequencies of the plurality of high frequency and intermediate frequency voltages are input. And a plurality of resonant circuits provided by the control oscillator. The method of claim 1, wherein when data is input to the plurality of high frequency and intermediate frequency phase locked loops, data is input to the plurality of high frequency phase locked loops and then data is input to the plurality of intermediate frequency phase locked loops. Multi-carrier reception device of a mobile terminal, characterized in that.

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