WO2003032508A1 - Appareil sans fil pouvant communiquer dans deux bandes de frequence, et procede de generation de signal d'oscillation locale dans l'appareil sans fil - Google Patents
Appareil sans fil pouvant communiquer dans deux bandes de frequence, et procede de generation de signal d'oscillation locale dans l'appareil sans fil Download PDFInfo
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- WO2003032508A1 WO2003032508A1 PCT/JP2001/008729 JP0108729W WO03032508A1 WO 2003032508 A1 WO2003032508 A1 WO 2003032508A1 JP 0108729 W JP0108729 W JP 0108729W WO 03032508 A1 WO03032508 A1 WO 03032508A1
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- 230000010355 oscillation Effects 0.000 title claims abstract description 149
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
- H03J1/0041—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor for frequency synthesis with counters or frequency dividers
- H03J1/005—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor for frequency synthesis with counters or frequency dividers in a loop
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
- H04B1/28—Circuits for superheterodyne receivers the receiver comprising at least one semiconductor device having three or more electrodes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
- H04B1/406—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with more than one transmission mode, e.g. analog and digital modes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/12—Frequency diversity
Definitions
- the present invention relates to a wireless device capable of communicating in two frequency bands and a method of generating a local oscillation signal in the wireless device.
- the present invention relates to a wireless device, and in particular, has a local oscillation signal generation device that generates a local oscillation signal having two types of frequencies so that communication can be performed by switching a frequency between two communication bands in real time.
- a local oscillation signal generation device that generates a local oscillation signal having two types of frequencies so that communication can be performed by switching a frequency between two communication bands in real time.
- the present invention also relates to a method for generating a local oscillation signal having two kinds of frequencies in such a radio device.
- the UHF 800MHZ band called the 800M band
- the quasi-microwave 1.5GHz band called the 1.5G band
- the 800M band provided for mobile phones is likely to have a shortage of line capacity due to the increasing number of users and the fact that it is being used for data communications.
- a mobile communication terminal that can shift to another band with sufficient line capacity in real time and continue talking even during a call.
- it supports both the 800M band and the 1.5G band. If this band runs short during communication in the 800M band, it automatically shifts to the 1.5G band (hopping), or vice versa.
- mobile communication terminals that can automatically migrate, that is, dual-band mobile communication terminals.
- the dual-band mobile communication terminal finds an empty slot in one band from the other band in real time, prompts the base station to shift to the empty slot, and executes the shift to the empty slot. Performs a Mobinore assisted handover (MA HO: Mobile Assisted Hand-Over).
- MA HO Mobile Assisted Hand-Over
- dual-band mobile communication terminals In real time, the slot is shifted from one band to the other band in response to an instruction from the base station even during a call or packet waiting or during a call.
- GPRs GSM Packet Radio Service
- a broadband CDMA service is scheduled in the 2GHz band, and this service will be compatible with existing UHF band services until the service area is sufficiently expanded. It is necessary, and a dual-band mobile communication terminal is also required for this purpose.
- FIG. 6 is a block diagram showing the configuration of a dual-band mobile communication terminal that supports the 800M band and the 1.5G band using conventional technology.
- the dual-band mobile communication terminal shown in Fig. 6 processes the 800M band signal transmission and reception units 103 and 1.5G band signals in order to process the 800M band and 1.5G band. And a transmission / reception unit 104 that performs communication.
- the RF reception signal When the radio frequency signal (RF reception signal) received by the antenna 101 is in the 800M band, the RF reception signal is transmitted to the amplifier 310 of the transmission / reception unit 103 via the antenna switch 102. Given and amplified. After amplification, the RF reception signal is multiplied by the multiplier (mixer) 303 with the local oscillation signal from the voltage controlled oscillator (VCO) 308, and an intermediate frequency (130 MHz) signal (IF reception signal) After that, it is given to the intermediate frequency unit 105.
- VCO voltage controlled oscillator
- the RF reception signal when the RF reception signal is in the 1.5G band, the RF reception signal is supplied to the amplifier 410 of the transmission / reception unit 104 via the antenna switch 102 and is amplified. After amplification, the RF reception signal is multiplied by a local oscillator signal from the VCO 408 by a multiplier (mixer) 403, and converted to an IF reception signal of an intermediate frequency (130 MHz). 0 is given to 5.
- one of the IF reception signals from the transmission / reception section 103 or 104 is output. Is selected, and the selected IF reception signal is further frequency-converted, and is provided to the baseband processing control unit 106.
- the transmission signal provided from baseband processing control section 106 to intermediate frequency section 105 becomes a 260 MHz signal (IF transmission signal) when the transmission signal is transmitted on an 800 M band channel, and a 1.5 G band transmission signal.
- the signal is converted into an IF transmission signal of 82 MHz, respectively, and given to the multiplier (mixer) 304 of the transmission / reception section 103 or the multiplier (mixer) 404 of the transmission / reception section 104.
- the IF transmission signal is multiplied by the local oscillation signal from the VC0308, and frequency-converted to an 800M-band RF transmission signal.
- the IF transmission signal is multiplied by the local oscillation signal from the VCO 308, and the frequency is converted to a 1.5G-band RF transmission signal.
- These RF transmission signals are amplified by the amplifiers 302 and 402, respectively, and then transmitted from the antenna 101 via the antenna switch 102.
- the switching of the antenna switch 102 is controlled by the baseband processing control unit 106.
- a dual-band mobile communication terminal with such a configuration cannot quickly switch channels between the two bands.
- the RF reception signal and the RF transmission signal are allocated in the specified range (for the 800M band RF reception signal in the range of 810 to 885 MHz, as shown in Fig. 1 described later) in both the 800M band and the 1.5G band.
- a variable frequency that changes according to The VCO 308 or VCO 308 is used to convert the RF received signal with the variable frequency to a fixed 130 MHz IF received signal, or to convert the fixed 260 MHz or 82 MHz IF transmitted signal to a variable RF transmitted signal.
- the frequency of the 408 local oscillation signal is also controlled to change in accordance with the frequency of the RF reception signal or RF transmission signal. Now, it is complicated to show these frequencies in a variable range, so the representative value is determined as follows, and based on this representative value, the switching time is 4 ms.
- the typical value of 800M band RF transmission frequency is 949MHz (center value of transmission frequency (up frequency)), the typical value of reception frequency is 819MHz (center value of reception frequency (down frequency)), the typical value of local oscillation frequency is 689MHz (Local oscillation frequency at transmission frequency 949MHz and reception frequency 819MHz).
- the typical value of the transmission frequency in the 1.5G band is 1441 MHz (the center value of the rising frequency)
- the typical value of the receiving frequency is 1489 MHz (the center value of the falling frequency)
- the typical value of the local oscillation frequency is 1359 MHz (the (Local oscillation frequency at reception frequency 1489MHz).
- the 800M band local oscillation signal is generated by a phase-locked loop (PLL) in which the signal loops from the integer divider 305 to the integer divider 305 via the phase comparator 306, low-pass filter (LPF) 307, and VCO 308. Generated.
- the local oscillation signal in the 1.5G band is generated by a PLL in which the signal loops from the integer divider 405 to the integer divider 405 via the phase comparator 406, LPF 407, and VC0408. .
- the comparison frequency input to the phase comparators 306 and 406 is set to 25 KHZ or less in order to synthesize local oscillation frequencies at 25 KHz intervals, which are channel intervals of 800 M band and 1.5 G band.
- the comparison frequency is 25 KHz as shown in Fig. 6.
- the loop gain K of P L L is inversely proportional to the division number N. Therefore, in the 1.5G band, the loop gain of PLL becomes a small value. This is why the channel switching time is about 4 ms.
- the LPFs 307 and 407 of mobile communication terminals generally have a second-order lag filter called a lag-lead filter consisting of fixed resistors R 1 and R 2 and a fixed capacitor C. Used. This is because the circuit configuration of this filter is simple, so that the LPF can be realized in a small size, and the natural angular frequency ⁇ and damping coefficient ⁇ can be set individually.
- the bouncing (bounce) due to vibration approaches convergence in about three times.
- the range considered to converge is when the phase error falls within the range of soil ⁇ (the local oscillation frequency error is, for example, approximately ⁇ 1 kHz).
- the convergence time is defined as the time until the phase error (or frequency error) falls within the range considered as convergence.
- the local oscillation frequency takes about 4 ms from the switching from the 800M band to the 1.5G band until it reaches the frequency corresponding to the reception channel or transmission channel.
- the transition time from the 1.5G band to the 800M band is calculated in the same way and is about 2ms.
- a local oscillation signal can be synthesized using a fractional frequency divider.
- Figure 9 shows the results except that the integer frequency dividers 305 and 405 in Fig. 6 are replaced with fractional frequency dividers 315 and 415, respectively, and that the comparison frequency is replaced with 400KHZ and 600KHz. It has the same configuration as 6.
- the advantage of the fractional divider is that the interval of the divisor can be set to an integer value or less (for example, 0.1 interval), and as a result, the comparison frequency can be set higher than 25 KHz. As a result, the loop gain K of the PLL increases, and as a result, the convergence time can be shortened.
- the local oscillation frequency is 1359.575 MHz
- the mobile communication terminal will be required to comply with the adjacent channel leakage power specification in its transmission characteristics, the adjacent channel and next adjacent selectivity in the reception characteristics, and the mutual selectivity. There is a problem that it is difficult to conform to the standards of the anti-jamming characteristics represented by the modulation response suppression.
- the fractional frequency divider and the phase comparator be composed of a single monolithic integrated circuit.
- Problem it is difficult to integrate a circuit that implements a frequency divider that can set an arbitrary fractional frequency at frequencies exceeding 1 GHz because of the large circuit scale.
- an additional circuit technology has been proposed to overcome the problem of the fractional fraction processing described above, but this additional circuit further increases the circuit scale. Even if a monolithic PLL LSI is manufactured, the price will increase and this will go against the technological trend of reducing the cost of mobile communication terminals. Disclosure of the invention
- the present invention has been made in view of such a background, and has as its object to provide a wireless device having a local oscillation signal generating device capable of switching between two communication bands at high speed, and a wireless device having a local oscillation signal generating device.
- An object of the present invention is to provide a method for generating various types of local oscillation signals.
- a wireless device performs frequency conversion corresponding to signals in different frequency bands, and generates a first signal having a first frequency in a wireless device that realizes wireless communication.
- a second divider to which a feedback signal is input; a second phase comparator for comparing the phase of the output signal of the second divider with the phase of a second reference input signal having a predetermined frequency;
- a second filter for filtering an output signal of the second phase comparator; and a second signal having a second frequency lower than the first frequency based on the output signal of the second filter.
- a second signal generation unit having a second voltage-controlled oscillator that feeds back a signal to the second frequency divider as the feedback signal; synthesizing the first signal and the second signal; Local having a frequency obtained by adding two frequencies
- a local oscillation signal generation device having a frequency signal, or a local oscillation signal having a frequency obtained by subtracting the second frequency from the first frequency.
- the local oscillation signal is used for the frequency conversion in the wireless communication.
- the local oscillation signal generation method generates a local oscillation signal used for the frequency conversion in a wireless device that performs frequency conversion corresponding to signals in different frequency bands and realizes wireless communication.
- a first signal having a first frequency a voltage-controlled oscillator, a frequency divider to which a feedback signal from the voltage-controlled oscillator is input, A phase comparator for comparing a phase of an output signal of the phase comparator with a phase of a reference input signal having a predetermined frequency, and a filter for filtering an output signal of the phase comparator and providing the output signal to the voltage controlled oscillator.
- a second signal having a second frequency lower than the first frequency is generated by the phase lock loop having the first frequency, the first signal and the second signal are combined, and the second signal is combined with the first frequency.
- a local oscillation signal having a frequency obtained by adding the second frequency or a local oscillation signal having a frequency obtained by subtracting the second frequency from the first frequency is generated.
- the first signal having the first frequency is generated by the first signal generator.
- a second signal having a second frequency smaller than the first frequency is generated by the second signal generator.
- the first signal and the second signal are combined and a local oscillation signal having a frequency obtained by adding the second frequency to the first frequency, or a local oscillation signal having a frequency obtained by subtracting the second frequency from the first frequency. Is generated.
- a local oscillation signal having a frequency obtained by adding the second frequency to the first frequency and a local oscillation signal having a frequency obtained by subtracting the second frequency from the first frequency there are a local oscillation signal having a frequency obtained by adding the second frequency to the first frequency and a local oscillation signal having a frequency obtained by subtracting the second frequency from the first frequency.
- Various types of local oscillation signals can be generated. From this, local oscillation that converts each communication frequency of two communication bands of a wireless device (for example, a dual-band mobile communication terminal) that performs communication by switching the frequency between two communication bands to another frequency (for example, an intermediate frequency). A signal can be generated.
- the frequency of the second signal can be lower than the frequency of the local oscillation signal generated by the addition.
- the value of the frequency division number of the second frequency divider can be made smaller than when the local oscillation signal is directly generated by the second signal generator.
- the convergence time of the second signal generator can be shorter than that of the conventional one, and when this local oscillation signal generator is used in a dual-band mobile communication terminal, switching between the two communication bands is performed. Can be done at high speed.
- the first frequency of the first signal generated by the first signal generator is a constant frequency
- the second frequency divider of the second signal generator can set a variable frequency division number.
- the 21st frequency of the second signal generated by the second signal generation unit is variable according to the frequency division number.
- the second frequency divider is an integer frequency divider whose frequency division number takes a positive integer value. This facilitates the integration of the device including the second frequency divider and realizes the reduction in size and weight of the device. In addition, it is possible to prevent a decrease in spectral purity as in the case where a frequency divider is used.
- the frequency synthesizer shifts a phase of the first signal, and outputs a third signal whose phase is relatively advanced by ⁇ 2 and a relatively phase shifted signal.
- a first phase shifter that generates a fourth signal delayed by ⁇ / 2, and a phase shifter that shifts the phase of the second signal.
- a second phase shifter for generating a sixth signal, and a local oscillation signal having a frequency obtained by adding the second frequency to the first frequency, inverting the sign of the fifth signal, When generating a local oscillation signal having a frequency obtained by subtracting the second frequency from the first frequency, a non-inverting inverter that does not invert the sign of the fifth signal;
- a first multiplier for multiplying the fifth signal via an inverter, a second multiplier for multiplying the fourth signal and the sixth signal, an output signal of the first multiplier and the second And an adder for adding the output signal of the multiplier.
- a wireless device performs frequency conversion corresponding to signals in different frequency bands, and in a wireless device that realizes wireless communication, a first frequency divider to which a feedback signal is input; A first phase comparator for comparing the phase of the output signal of the 1 frequency divider with the phase of a first reference input signal having a predetermined frequency; a first filter for filtering the output signal of the first phase comparator; A first voltage-controlled oscillator that generates a first signal having a first frequency based on the output signal of the first filter and that feeds back the first signal to the first frequency divider as the feedback signal.
- a first signal generator, a second divider to which the feedback signal is input, and a phase of an output signal of the second divider and a phase of a second reference input signal having a predetermined frequency are compared.
- a second phase comparator, and an output signal of the second phase comparator are compared.
- a second signal generation unit having a second voltage-controlled oscillator that feeds back as the feedback signal; and a frequency obtained by combining the first signal and the second signal and adding the second frequency to the first frequency.
- the local oscillation signal generated by the frequency synthesizer is used for frequency conversion in the wireless communication.
- the local oscillation signal generating method provides the above-described frequency conversion in a wireless device that performs frequency conversion corresponding to signals in different frequency bands to realize wireless communication.
- a local oscillation signal generating method for generating a local oscillation signal used for conversion comprising: a first voltage controlled oscillator; a first frequency divider to which a feedback signal from the first voltage controlled oscillator is input; A first phase comparator for comparing the phase of the output signal of the frequency divider with the phase of a first reference input signal having a predetermined frequency; and filtering the output signal of the first phase comparator.
- a second signal having a first frequency is generated by a phase locked loop having a first filter provided to the first voltage controlled oscillator, and a feedback signal from the second voltage controlled oscillator is input.
- a local oscillation signal having a frequency obtained by adding a second frequency to a first frequency, and a first frequency and a second frequency Two types of local oscillation signals can be generated: a local oscillation signal having a frequency obtained by subtracting the smaller one from the larger one.
- a local oscillation signal having a frequency obtained by subtracting the smaller one from the larger one it is possible to generate a local oscillation signal that converts each communication frequency in two communication bands to another frequency (for example, an intermediate frequency) in a wireless device such as a dual-band mobile communication terminal.
- the frequency of the first signal can be lower than the frequency of the local oscillation signal generated by the addition.
- the value of each frequency division number of the first frequency divider can be made smaller than when the local oscillation signal is directly generated by the first signal generator.
- the convergence time of the first signal generator can be made shorter than that of the conventional one, and when this local oscillation signal generator is used in a dual-band mobile communication terminal, the convergence time between the two communication bands can be reduced. Switching can be performed at high speed. The same is true for the second signal.
- the wireless device is configured to convert a signal in the first frequency band into a signal in the third frequency band.
- the signal in the first frequency band can be transmitted to other wireless devices.
- a first output unit that outputs a signal of a predetermined frequency belonging to a band sandwiched between the third frequency band and the fourth frequency band;
- a second output unit for outputting a signal in a predetermined frequency band, and a signal having a frequency equal to the sum of the frequencies of the two signals, using signals from the first output unit and the second output unit.
- a generation unit for generating and outputting a signal having a frequency difference between the signal frequencies as the signal in the third frequency band or the signal in the fourth frequency band.
- the wireless device converts the frequency of the signal of the first frequency band using the signal of the third frequency band and the frequency of the signal of the second frequency band using the signal of the fourth frequency band.
- the third frequency band and the third frequency band can be received in a wireless device that can receive and process either the signal in the first frequency band or the signal in the second frequency band from another wireless device.
- a first output unit that outputs a signal of a predetermined frequency belonging to a band sandwiched by a fourth frequency band, a second output unit that outputs a signal of a predetermined frequency band, the first output unit and the second output unit
- the signals having the sum of the frequencies of the two signals or the signals having the difference between the frequencies of the two signals are used as the signals of the third frequency band or the fourth frequency, respectively.
- Figure 1 is an explanatory diagram of the frequency bands used for the 800M band and 1.5G band in Japan.
- FIG. 2 is a block diagram showing a configuration of the mobile communication terminal according to the embodiment of the present invention.
- FIG. 3 shows the relationship between the first frequency F H , the second frequency F, and the local oscillation frequency synthesized from the first frequency F H and the second frequency F.
- FIG. 4 is a block diagram showing one configuration example of the frequency synthesizer according to the embodiment of the present invention. It is.
- FIG. 5 is a block diagram illustrating another configuration example of the frequency synthesizer according to the embodiment of the present invention.
- Figure 6 is a block diagram showing the configuration when a dual-band mobile communication terminal supporting the 800M band and the 1.5G band is configured using conventional technology.
- Figure 7 is a circuit diagram showing a configuration example of a low-pass filter.
- Figure 8 shows how the local oscillation frequency converges.
- Figure 9 is a block diagram showing another configuration when a dual-band mobile communication terminal that supports the 800M band and the 1.5G band is configured using the conventional technology.
- Figure 10 shows how the spectrum purity of the signal at the local oscillation frequency is degraded.
- a dual-band mobile communication terminal capable of communicating in both the 800M band and the 1.5G band will be described, taking mobile communication in Japan as an example.
- Figure 1 is an explanatory diagram of the frequency bands used for the 800M band and the L5G band in Japan.
- a band from 810MHz to 885MHz is used as a downlink communication band from the base station to the mobile communication terminal (mobile terminal reception band), and an upward communication band from the mobile communication terminal to the base station (mobile terminal).
- the communication band from 893 MHz to 958 MHz is used as the transmission band.
- Both the downstream communication band and the upstream communication band are commonly divided into A band (former analog band), C band, and D band (digital band), which are commonly used in the technical field to which the present invention belongs. Since it is well known to those having knowledge of the above (the person skilled in the art), the description thereof is omitted here.
- the band from 1477MHz to 1501MHz is used as the downlink communication band.
- the communication band from 1429MHz to 1453MHz is used as the upstream communication band.
- a reception channel is set using one frequency with a downlink communication band (frequency at 25 kHz intervals), and transmission is performed using one frequency with an uplink communication band (frequency at 25 kHz intervals).
- the channel is set.
- the local oscillation frequency of the local oscillation signal (transmission local signal) used to convert the intermediate frequency (IF: Intermediate Frequency) transmission signal to the radio frequency (RF: Radio Frequency) transmission signal is The band is from 633 MHz to 698 MHz, and the local oscillation frequency of the local oscillation signal (reception local signal) used to convert the RF reception signal to the IF reception signal is 633 MHz to 755 MHz.
- the local oscillation frequency of the transmitting local oscillation signal matches the local oscillation frequency of the receiving local oscillation signal, which is between 1374MHz and 1371MHz.
- FIG. 2 is a block diagram showing a configuration of a dual-band mobile communication terminal according to an embodiment of the present invention.
- this dual-band mobile communication terminal (hereinafter simply referred to as a “terminal”) can communicate in both the 800M band and the 1.5G band.
- This terminal is equipped with antenna 1, antenna switch 2, transmitting / receiving unit for 800M band 3, transmitting / receiving unit for 1.5G band, intermediate frequency unit 5, baseband processing / control unit 6, and user input / output unit 7. I have.
- the transmission / reception section 3 for the 800M band includes amplifiers 31 and 32, multipliers (mixers) 33 and 34, integer divider 35, phase comparator 36, low-pass filter (hereinafter referred to as “LPF”) 37, And a voltage controlled oscillator (hereinafter referred to as “VCO”) 38.
- the transmission / reception unit 4 for the 1.5G band includes amplifiers 41 and 42, multipliers (mixers) 43 and 44, an integer frequency divider 45, a phase comparator 46, an LPF47, and a VC048.
- the transmitting and receiving units 3 and 4 have a frequency synthesizer 30 and a DMUX 40 in common.
- the 038 and 48 be constituted by one integrated circuit 10 in order to reduce the size and weight of the terminal.
- the intermediate frequency section 5 is composed of selectors (hereinafter referred to as “SEL”) 51 and 56, multipliers (Mixer) 52, 129.
- Oscillator 53 that generates 55MHz local oscillation signal 53
- Demultiplexer (hereinafter referred to as “DMU X”) 54, Quadrature modulator 55, Oscillator generating 260MHz local oscillation signal 5 7 and an oscillator 58 that generates a local oscillation signal of 82 MHz are provided.
- Antenna 1 transmits and receives radio signals in the 800M and 1.5G bands, and includes, for example, whip antennas and diversity antennas.
- the antenna switch 2 sends the 800M band signal input from the antenna 1 to the transmission / reception unit 3 and the 1.5G band signal to the transmission / reception unit 4, and selects the signal input from the transmission / reception unit 3 or 4. , Transmit via antenna 1.
- Such switching control of the antenna switch 2 is performed by the baseband processing control unit 6.
- the transmission / reception unit 3 converts the 800M-band RF reception signal (hereinafter referred to as “RF reception signal”) input from the antenna switch 2 into an IF (130MHz (fixed)) reception signal (hereinafter referred to as “IF reception signal”).
- RF reception signal is supplied to the intermediate frequency section 5 and the IF (260 MHz (constant)) transmission signal (hereinafter referred to as “IF transmission signal”) input from the intermediate frequency section 5 is 800M.
- the signal is converted into an RF transmission signal of the band (hereinafter referred to as “RF transmission signal”) and given to antenna switch 2.
- the transmission / reception unit 4 converts the 1.5 G band RF reception signal into an IF reception signal (130 MHz (fixed)) and converts the IF transmission signal (62 MHz (-fixed)) into the 1.5 G band RF signal.
- the signal is converted into a transmission signal and given to antenna switch 2.
- the IF reception signal and the IF transmission signal have a constant frequency, whereas the RF reception signal and the RF transmission signal have a frequency that changes according to the set channel in the band shown in Fig. 1 described above. .
- either the 800M IF received signal or the 1.5G band IF received signal is selected by the SEL 51 and supplied to the multiplier 52 '.
- a signal of a local oscillation frequency of 129.55 MHz is given to the multiplier 52 by the oscillator 53.
- the IF reception signal is converted into a signal having a frequency of 450 KHZ (constant), and supplied to the baseband processing / control unit 6.
- the selection of SEL 51 is controlled by the baseband processing controller 6 (control lines are not shown).
- the transmission signal is input to the intermediate frequency section 5 from the baseband processing Z control section 6 in the form of an in-phase signal (I signal) and a quadrature signal (Q signal). These transmission signals are supplied to the quadrature modulator 55 of the intermediate frequency section 5.
- the 260 MHz (constant) local oscillation signal (local signal) of the oscillator 57 or the 82 MHz (constant) local oscillation signal of the oscillator 58 is input from the SEL 56.
- the SEL 56 selects the local oscillation signal of the oscillator 57 when the quadrature modulator 55 processes the 800M band transmission signal, and uses the oscillator when the quadrature modulator 55 processes the 1.5G band transmission signal. Selects 58 local oscillation signals. Such selection of the SEL 56 is controlled by the baseband processing / ⁇ control unit 6 (control lines are not shown).
- the quadrature modulator 55 quadrature-modulates the I signal and Q signal input from the baseband processing control unit 6 and converts the quadrature-modulated signal into a 260 MHz or 82 MHz signal using the local oscillation signal input from the SEL 56. Convert to IF transmission signal with frequency.
- the IF transmission signal is provided to DMUX 54, the 800M band IF transmission signal is provided to multiplier 34, and the 1.5G band IF transmission signal is provided to multiplier 44.
- the selection of such an output route of the DMUX 54 is controlled by the baseband processing Z control unit 6 (control lines are not shown).
- the baseband processing control unit 6 processes the signal input from the intermediate frequency unit 5 and outputs the processed signal to the user input / output unit 7 and the signal (audio signal) input from the user via the user input / output unit 7. , Video signals, etc.) and give them to the intermediate frequency unit 6.
- the baseband processing / control unit 6 controls the above-described SEL 51, 56, DMUX 54, 40, frequency synthesizer 30 (described in detail later), and the like.
- the user input / output unit 7 includes a speaker, a microphone, a display device (such as a liquid crystal display), a camera, and the like.
- the user input / output unit 7 outputs the signal supplied from the baseband processing / control unit 6 to a speaker, a display device, and the like, and also outputs the signal input from a microphone, a camera, etc. to the baseband processing / control unit 6 Give to.
- PLL phase lock loop
- a fixed dividing number N 1 (integer value) is set. This division The number Nl may be stored in the integer divider 35 in advance, or may be set by the baseband processing / control unit 6 when the terminal is started up.
- the phase comparator 36 receives the output signal of the integer frequency divider 35 and a signal having a constant frequency F given from an oscillator (not shown) (for example, a crystal oscillator). This signal may be provided from an oscillator via a frequency divider (not shown). As a result, a signal having a constant frequency F u (hereinafter, referred to as “first frequency”) is supplied from the VC 0 38 to the frequency synthesizer 30 and the integer frequency divider 35.
- first frequency a signal having a constant frequency F u
- the loop of the signal returned from the integer divider 45 of the transmission / reception unit 4 to the integer divider 45 via the phase comparator 46, LPF 47, and VC0 48 also forms a PLL. You.
- the integer frequency divider 45 has a variable frequency division number N 2 (integer) corresponding to the frequency of the RF reception signal or RF transmission signal in the 800M band or the frequency of the RF reception signal or RF transmission signal in the 1.5G band. Is set by the baseband processing / control unit 6 (signal lines for setting are not shown).
- the phase comparator 46 receives the output signal of the integer frequency divider 45 and a signal having a constant frequency Fn provided by an oscillator (not shown) (for example, a crystal oscillator). This signal may be provided from an oscillator via a frequency divider (not shown). This ensures that the VC 0 4 8, a signal having a value corresponding to the frequency of the RF reception signal or the RF transmission signal (frequency F n every variable) frequency F L (hereinafter referred to as "second frequency".) Is given to the frequency synthesizer 30 and the integer frequency divider 45.
- the frequency of the RF reception signal and the RF transmission signal changes (at 25KHZ intervals) in the 800M band and 1.5G band according to the channel allocated for communication in the bandwidth shown in Fig. 1.
- the explanation is made using representative values.
- the representative value of the local oscillation frequency in the 800M band is 689MHz, which is the local oscillation frequency at a transmission frequency of 949MHz and a reception frequency of 819MHz.
- the representative value of the local oscillation frequency in the 1.5G band is 1359 MHz, which is the local oscillation frequency at the transmission frequency of 1441 MHz and the reception frequency of 1489 MHz.
- the frequencies are far enough apart. Therefore, considering that both local oscillation frequencies are variable, these local oscillation frequencies do not overlap or come close to each other. Therefore, the midpoint of these frequencies is determined, and the frequency at this midpoint is defined as the first frequency Fu given from VC038 to the frequency synthesizer.
- the division number N 1 1024MHz, for example, the division number N 1 Is set to.
- the combination of the value of the frequency division number N1 and the value of the frequency F, is also an example, and another combination that allows the VCO 38 to generate the first frequency Fu may be used.
- the second frequency and the frequency synthesizer 30 are combined with the first frequency Fu, so that the frequency of the 800 M band local oscillation signal (representative value 689 MHz) and the frequency of the 1.5 G band local oscillation signal (representative value 1359 MHz) ) Is set to a value that can generate (variable).
- the frequency synthesizer 30 by adding the signals of the second frequency F L to the signal of the first frequency Fu generates a signal of a local oscillation frequency 1359MHz (typical) of 1.5G band, the first frequency Fu generating a 800M band of the local oscillation frequency 689MHz (typical) by subtracting the signal of the second frequency F L from the signal.
- the second frequency F is typically
- This second frequency is a relatively low frequency in the lower limit of the UHF band.
- FIG. 3 shows the relationship between the first frequency F H , the second frequency F, and the local oscillation frequency synthesized from the first frequency F H and the second frequency F I ⁇ .
- 800M band station unit width of change in the oscillation frequency and, in consideration of the width of variation of the local oscillation frequency of the 1.5G band, the second frequency F L is set to a range of 391MHz from 269MHz.
- the range of the local oscillation frequency in the 1.5G band is narrower than that in the 800M band. Therefore, in the 1.5G band, the fluctuation range of the frequency division number N2 is 1294 to 13880.
- the frequency division number of such an integer frequency divider 46 is about one-fourth of the conventional frequency division numbers 54 and 360.
- about one quarter of about 4ms convergence time also conventional second frequency F n is about (1 thousandth of a second) ie lms.
- This second frequency F jj is used to generate both the 800M band local oscillation frequency and the 1.5G band local oscillation frequency. Therefore, the convergence time of the local oscillation frequency in the 800M band and the local oscillation frequency in the 1.5G band is about 1/4 of 4ms, lms. On the other hand, since the first frequency Fu is fixed, there is no need to consider the convergence time (it always converges).
- both the switching time from the 800M band to the 1.5G band and the switching time from the 1.5G band to the 800M band can be kept within about lms. Therefore, it can satisfy the requirements of terminals that require real-time switching.
- the integer dividers 35 and 45 are used, the portion indicated by reference numeral 21 in FIG. 2 (that is, the integer divider 35, the phase comparator 36, and the circuit for generating the frequency F T ). (e.g. crystal oscillator (and integer divider)) consisting of portions) and portions indicated by reference numeral 22 (i.e. the integer divider 45, a phase comparator 46, and the frequency F n of the generating circuit (e.g. a crystal oscillator (and integral submultiple It is also easy to configure each part consisting of the peripherals)) with monolithic integrated circuits (PLL integrated circuits).
- PLL integrated circuits monolithic integrated circuits
- the integer divider 35 since the integer divider 35 is used, it is possible to prevent the spectral purity of the signal having the local oscillation frequency from deteriorating. It is easy to conform to the standards for the anti-jamming characteristics represented by the adjacent channel and next adjacent selectivity in the signal characteristics and the degree of suppression of intermodulation response.
- the frequency synthesizer 30 subtracts the second frequency F from the first frequency F u to generate the frequency of the 800 M band local oscillation signal (representative value 689 MHz), and generates the second frequency F u as the first frequency F u. by adding the F t, it generates a 1. local oscillation signal 5G band frequency (typical 1359MHz). In this way, these local oscillation frequencies are indirectly synthesized from the two frequencies by signal processing. Indirect means that the frequency source is not a direct local oscillator frequency source.
- the frequency sum or difference between two frequencies is obtained by multiplying the two frequencies by a multiplier.
- the carrier signal as the two frequency sources is suppressed, and the energy is equally divided into the lower sideband, which is the frequency difference, and the upper sideband, which is the sum of frequencies.
- one unused frequency is attenuated by the finoleta, and only the other used frequency is obtained by passing through the filter.
- FIG. 4 is a block diagram showing a detailed configuration of the frequency synthesizer 30 according to the embodiment of the present invention.
- the frequency synthesizer 30 includes one ⁇ / 4 phase shifters 11 and 15, + ⁇ 4 phase shifters 12 and 16, multipliers 13 and 14, non-inverting ⁇ inverting switch 17, In addition, an adder 18 is provided.
- Local oscillation signal with first frequency F u output from VC 0 38 (see Figure 2) SI is input to one ⁇ / 4 phase shifter 11 and + ⁇ / 4 phase shifter 12. Further, the local oscillation signal S 2 having the second frequency F L which is output from the V CO 4 8 (see FIG. 2) is one [pi / 4 phase shifters 1 5 and + [pi / 4 phase shifter 1 6 Is entered.
- the local oscillation signal S 2 cos (co L t)
- (£ L 2 F j
- the output signal from the phase shifter 15 S 15 cos (c L t- ⁇ / 4)
- the output signal from the phase vessel 1 6 S 1 6 cos ( ⁇ L t + ⁇ / 4).
- the non-inverting and inverting switch 17 are provided with a ⁇ / 4 phase shifter 1
- the sign of the signal from 5 is not inverted (that is, the input signal is output as it is), and when the frequency sum is obtained, the sign is inverted (that is, the voltage value of the input signal is inverted and output).
- a 1 (1/2) ⁇ ⁇ cos ( ⁇ v t + ⁇ L t— ⁇ / 2) + cos (, ⁇ yt— ⁇ L t) ⁇
- the multiplier 14 multiplies the output signal S12 of the phase shifter 12 by the output signal S16 of the phase shifter 18 and outputs the multiplication result A2.
- the adder 18 adds the multiplication results A1 and A2 and outputs the addition result R.
- the frequency of the addition result R is the difference between the first frequency Fu and the second frequency F L.
- the frequency synthesizer 30 having such a configuration can be realized as a small-scale integrated circuit.
- the frequency synthesizer 30 can be realized as an integrated circuit having a size of several millimeters by applying, for example, a chip size package (CSP). If the frequency synthesizer 30 is a circuit of this size, the frequency synthesizer 30 can be incorporated into a custom chip or ASIC (Application Specific Integrated Circuit) used in the terminal. It is.
- ASIC Application Specific Integrated Circuit
- the frequency synthesizer 30 is provided with four ⁇ ⁇ 4 phase shifters. These can be easily realized in a power integrated circuit. This is because the phase can be changed arbitrarily by providing a transmission line with an appropriate length if a monolithic microphone-port-wave integrated circuit process is used. Alternatively, it is also possible to form coils and capacitors with distributed constants and combine them to form a phase circuit. A coil with a lumped constant may be formed spirally, or a capacitor with a lumped constant may be formed by forming an appropriate area. A delay line may be used.
- the multipliers 13 and 14 can be composed of a circuit called a Gilbert Cell.
- the basic circuit of this Gilbert cell is composed of several transistors and about 10 fixed resistors attached to them. Therefore, since this Gilbert cell uses transistors with uniform relative characteristics by making it a monolithic integrated circuit, it can be used as an almost ideal multiplier. It is well known that it works. Since the circuit scale is small as described above, the frequency synthesizer 30 can be realized as an integrated circuit.
- the non-inverting and inverting switching switch can be easily realized by splitting the signal into two, passing one through as it is, amplifying the other with an inverting amplifier with a gain of 1, and selecting one of the paths by the switch using control logic.
- it can be easily realized by inserting a delay line of phase shift ⁇ or a transmission line corresponding to phase shift ⁇ into one path.
- the frequency synthesizer 30 can reduce the size, cost, and power consumption of the terminal.
- phase shifter 11 and a + ⁇ / 4 phase shifter 12 are provided for the branched signal of the first frequency F u.
- Each of the phase shift amounts of 1 and 2 is not limited to such a value, but is a phase shift amount that shifts the two branched first frequency signals Fu by ⁇ / 2 (90 degrees) with respect to each other. If there is any other phase shift, it can be used. The same applies to the phase shift amounts of the phase shifters 15 and 16.
- the terminal corresponding to the 800 MHz band and the 1.5 GHz band has been described above, but the present invention can also be applied to terminals corresponding to other bands.
- the present invention can be applied to a terminal corresponding to the 800 band and 1.9G band in North America, or a terminal corresponding to the 900M band and 1.8G band in Europe.
- the first frequency is fixed and the second frequency is variable, but both may be variable, or the first frequency may be variable and the second frequency may be fixed.
- the first signal having the first frequency may be constituted by, for example, a crystal oscillator (and a frequency divider) instead of PLL.
- the present invention relates to a local oscillation signal generation device and a local oscillation signal generation method for generating a local oscillation signal used for frequency conversion of a signal, and more particularly to a local oscillation signal generation device for generating a local oscillation signal having two types of frequencies. And the method of generating a local oscillation signal.
- a local oscillation signal generation device and a local oscillation signal generation method have two bands. It can be used for a dual-band mobile communication terminal capable of supporting a range.
- the convergence time of the local oscillation signal can be shortened, and when the present invention is used in a dual-band mobile communication terminal, communication can be performed by switching between two bands in real time.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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- Microelectronics & Electronic Packaging (AREA)
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- Transmitters (AREA)
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2001/008729 WO2003032508A1 (fr) | 2001-10-03 | 2001-10-03 | Appareil sans fil pouvant communiquer dans deux bandes de frequence, et procede de generation de signal d'oscillation locale dans l'appareil sans fil |
EP08153850A EP1995873A2 (en) | 2001-10-03 | 2001-10-03 | Radio equipment communicatable in two frequency bands and method for generating local oscillator signal in radio equipment |
EP01972682A EP1434358A4 (en) | 2001-10-03 | 2001-10-03 | WIRELESS DEVICE WITH THE ABILITY TO COMMUNICATE IN TWO FREQUENCY BANDS AND LOCALOSCILLATION SIGNAL GENERATION METHODS IN THE WIRELESS DEVICE |
JP2003535348A JP3929443B2 (ja) | 2001-10-03 | 2001-10-03 | 2つの周波数帯域で通信可能な無線装置および該無線装置における局部発振信号生成方法 |
CNB01823688XA CN100456643C (zh) | 2001-10-03 | 2001-10-03 | 双频带通信无线装置及其本机振荡信号生成方法 |
US10/817,410 US7130603B2 (en) | 2001-10-03 | 2004-03-30 | Radio equipment communicatable in two frequency bands and method for generating local oscillator signal in radio equipment |
US11/492,554 US7502595B2 (en) | 2001-10-03 | 2006-07-25 | Radio equipment communicatable in two frequency bands and method for generating local oscillator signal in radio equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2001/008729 WO2003032508A1 (fr) | 2001-10-03 | 2001-10-03 | Appareil sans fil pouvant communiquer dans deux bandes de frequence, et procede de generation de signal d'oscillation locale dans l'appareil sans fil |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/817,410 Continuation US7130603B2 (en) | 2001-10-03 | 2004-03-30 | Radio equipment communicatable in two frequency bands and method for generating local oscillator signal in radio equipment |
Publications (1)
Publication Number | Publication Date |
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WO2003032508A1 true WO2003032508A1 (fr) | 2003-04-17 |
Family
ID=11737804
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/008729 WO2003032508A1 (fr) | 2001-10-03 | 2001-10-03 | Appareil sans fil pouvant communiquer dans deux bandes de frequence, et procede de generation de signal d'oscillation locale dans l'appareil sans fil |
Country Status (5)
Country | Link |
---|---|
US (2) | US7130603B2 (ja) |
EP (2) | EP1995873A2 (ja) |
JP (1) | JP3929443B2 (ja) |
CN (1) | CN100456643C (ja) |
WO (1) | WO2003032508A1 (ja) |
Cited By (4)
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WO2005074152A1 (en) * | 2004-01-26 | 2005-08-11 | Koninklijke Philips Electronics, N.V. | Frequency generation for a multi-band ofdm based ultra wide-band radio |
WO2009101993A1 (ja) * | 2008-02-14 | 2009-08-20 | Nec Corporation | 移相器及びその制御方法、アレイアンテナを備える無線通信装置 |
CN1954508B (zh) * | 2004-03-02 | 2010-10-06 | Nxp股份有限公司 | 接收部分串行化的序列键控的超宽带码元的方法及接收机 |
US9071252B2 (en) | 2010-11-29 | 2015-06-30 | Kabushiki Kaisha Toshiba | Radio communication apparatus |
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US8249533B2 (en) * | 2003-12-19 | 2012-08-21 | Vixs Systems, Inc. | Rapidly adjustable local oscillation module and applications thereof |
US8811369B2 (en) * | 2006-01-11 | 2014-08-19 | Qualcomm Incorporated | Methods and apparatus for supporting multiple communications modes of operation |
JP4735312B2 (ja) * | 2006-02-14 | 2011-07-27 | パナソニック株式会社 | 受信装置とこれを用いた電子機器 |
US7805122B2 (en) * | 2006-08-29 | 2010-09-28 | Texas Instruments Incorporated | Local oscillator with non-harmonic ratio between oscillator and RF frequencies using digital mixing and weighting functions |
US7809338B2 (en) * | 2006-08-29 | 2010-10-05 | Texas Instruments Incorporated | Local oscillator with non-harmonic ratio between oscillator and RF frequencies using wideband modulation spectral replicas |
US20160286532A1 (en) * | 2012-01-24 | 2016-09-29 | Odyssey Wireless, Inc. | Systems/methods of preferentially using a first asset, refraining from using a second asset and providing reduced levels of interference to gps and/or satellites |
US8890625B2 (en) | 2013-01-03 | 2014-11-18 | Qualcomm Incorporated | Systems and methods for frequency synthesis to improve coexistence |
CN105721218A (zh) * | 2016-03-04 | 2016-06-29 | 深圳采集云数据科技有限公司 | 一种导医系统嵌入式固件升级系统 |
CN105721001A (zh) * | 2016-04-14 | 2016-06-29 | 国鹰河北航空科技有限公司 | 无人机目标定位系统 |
CN105871409B (zh) * | 2016-04-29 | 2018-12-04 | 公安海警学院 | 收发信机 |
US10693569B1 (en) * | 2019-03-08 | 2020-06-23 | Rohde & Schwarz Gmbh & Co. Kg | Method of providing a phase reference, method for establishing known phase relationships as well as phase reference system |
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WO2005074152A1 (en) * | 2004-01-26 | 2005-08-11 | Koninklijke Philips Electronics, N.V. | Frequency generation for a multi-band ofdm based ultra wide-band radio |
CN1954508B (zh) * | 2004-03-02 | 2010-10-06 | Nxp股份有限公司 | 接收部分串行化的序列键控的超宽带码元的方法及接收机 |
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Also Published As
Publication number | Publication date |
---|---|
EP1995873A2 (en) | 2008-11-26 |
CN1559107A (zh) | 2004-12-29 |
EP1434358A1 (en) | 2004-06-30 |
EP1434358A4 (en) | 2004-10-27 |
US7130603B2 (en) | 2006-10-31 |
US20060276142A1 (en) | 2006-12-07 |
US7502595B2 (en) | 2009-03-10 |
JPWO2003032508A1 (ja) | 2005-01-27 |
US20040192240A1 (en) | 2004-09-30 |
JP3929443B2 (ja) | 2007-06-13 |
CN100456643C (zh) | 2009-01-28 |
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