WO2004109928A1 - 周波数シンセサイザ及び無線通信装置 - Google Patents
周波数シンセサイザ及び無線通信装置 Download PDFInfo
- Publication number
- WO2004109928A1 WO2004109928A1 PCT/JP2004/008005 JP2004008005W WO2004109928A1 WO 2004109928 A1 WO2004109928 A1 WO 2004109928A1 JP 2004008005 W JP2004008005 W JP 2004008005W WO 2004109928 A1 WO2004109928 A1 WO 2004109928A1
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- WIPO (PCT)
- Prior art keywords
- frequency
- ratio
- switching
- noise peak
- voltage
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Classifications
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- 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
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the 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
- H03L7/08—Details of the phase-locked loop
- H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
- H03L7/107—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth
- H03L7/1075—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth by changing characteristics of the loop filter, e.g. changing the gain, changing the bandwidth
-
- 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
Definitions
- the present effort is suitable for a frequency synthesizer, for example, to be applied to a wireless communication device corresponding to a plurality of wireless communication systems.
- FIG. 1 is a block diagram showing the configuration of a conventional frequency synthesizer (see Japanese Patent Application Laid-Open No. 7-170181 (FIG. 1)).
- the oscillation output f r is output from the voltage controlled oscillation circuit 1 1, PLL (Phase Locked Loop ) 1 2 phase comparison between the criteria signal f ref is performed, the voltage loop filter is proportional to the phase difference
- the loop filter 13 has a cascade-connected lag-lead filter 13A and a low-pass filter 13B.
- the loop filter 13 supplies the control voltage S1 that has passed only the lag-lead filter 13A to the input terminal P1 of the analog switch SW1. Further, the control voltage S 2 passed through both the lag-lead filter 13 A and the low-pass filter 13 B is applied to the input terminal P 2 of the analog switch SW 1 and the differential absolute ⁇ circuit 14.
- the differential absolute value circuit 14 controls switching of the analog switch SW1 using the switching signal S3.
- the analog switch SW1 switches the switch according to the switching signal S3 output from the differential absolute value circuit 14. Specifically, when the switching signal S 3 indicates that high-speed lockup is prioritized, the control voltage S l, that is, the input terminal P 1 is selected, and the switching signal S 3 sets a high CN ratio. Give priority Is selected, the control voltage S2, that is, the input terminal P2 is selected.
- the control voltage selected by the analog switch SW 1 is supplied to the voltage-controlled oscillation circuit 11 via a voltage follower 15 for preventing the influence of a load change from affecting the voltage-controlled oscillation circuit 11. .
- the conventional frequency synthesizer is to readiness to the phase difference between the oscillation output f r and the reference signal f ref of the voltage controlled oscillation circuit, and controls the oscillation conditions of the voltage controlled oscillation circuit, high-speed lock-up and high CN The ratio is compatible.
- the required CN ratio Carrier to Noise Ratio
- a frequency synthesizer corresponding to each system must be provided, which leads to an increase in the scale of the device.
- the frequency synthesizer forms a signal that does not satisfy the required CN ratio, the reception sensitivity characteristics will deteriorate, making it impossible to make and receive calls in a weak electric field area, and the communication quality will deteriorate. Disclosure of the invention
- An object of the present invention is to provide a small frequency synthesizer and a wireless communication device corresponding to each received signal when a different CN ratio is required for each received signal.
- the above object is achieved by preparing a plurality of loop filters for realizing each CN ratio corresponding to a signal transmitted from a communication partner, and switching the loop filter according to the transmitted signal.
- Figure 1 is a block diagram showing the configuration of a conventional frequency synthesizer
- FIG. 2 is a block diagram showing a configuration of the frequency synthesizer according to Embodiment 1 of the present invention
- Fig. 3 is a diagram showing the CN ratio vs. frequency characteristics of the output signal of the frequency synthesizer.
- FIG. 4 is a block diagram showing a configuration of a frequency synthesizer according to Embodiment 2 of the present invention.
- FIG. 5 is a block diagram showing a configuration of a frequency synthesizer according to Embodiment 3 of the present invention.
- FIG. 2 is a block diagram showing a configuration of the frequency synthesizer according to Embodiment 1 of the present invention.
- a mode angle analyzer 101 analyzes which communication method among a plurality of wireless communication methods is used, based on a signal transmitted from a communication partner.
- the analysis method is to multiply the received signal by a predetermined spreading code
- demodulation is used to identify the CDMA method and other methods.
- the analysis result that is, information indicating the communication method used for communication is notified to the control unit 102.
- the control unit 102 includes a first frequency divider 104, a second frequency divider 105, and a switching unit 107 according to the communication method during communication notified from the mode analysis unit 101. Control.
- the mode analysis unit 101 and the control unit 102 function as control means.
- the reference signal generator 103 generates a signal serving as a reference of a frequency at which the frequency synthesizer can oscillate, and outputs the generated reference signal to the first frequency divider 104.
- the first frequency divider 104 changes the frequency division ratio based on the control of the control unit 102, and divides the frequency of the reference signal output from the reference signal generator 103 with the changed frequency division ratio. Go around.
- the frequency-divided signal is output to the phase comparator 106.
- the second frequency divider 105 changes the frequency division ratio based on the control of the control unit 102, and divides the frequency of the reference signal output from the voltage controlled oscillator 109 at the changed frequency division ratio. I do.
- the frequency-divided signal is output to the phase comparator 106.
- the phase comparator 106 compares the phase of the signal output from the first frequency divider 104 with the phase of the signal output from the second frequency divider 105, and calculates a voltage (control voltage) proportional to the phase difference. Voltage) to the switching unit 107.
- the switching unit 107 supplies the voltage supplied from the phase comparator 106 to one of the loop filters 108-1 to 108-N based on the control of the control unit 102.
- the noise peak frequencies ⁇ are set so as to correspond to the CN ratios required in a plurality of wireless communication systems, respectively.
- the obtained voltage is smoothed (averaged), and a DC voltage obtained by smoothing is applied to the voltage-controlled oscillator 109.
- the noise peak frequency ⁇ is a factor that affects the CN ratio because it determines the frequency at which noise peaks appear when averaging the voltage, and is determined by the capacitance of the capacitor that constitutes the loop filter.
- the C ⁇ ratio of the averaged signal can be set as the CN ratio corresponding to the signal transmitted from the communication partner.
- the voltage controlled oscillator 109 oscillates a signal having a frequency corresponding to the DC voltage given from any of the loop filters 108-1 to 108-N, and outputs a signal having a CN ratio corresponding to the wireless communication system under communication. .
- FIG. 3 is a diagram showing a CN ratio versus frequency characteristic in an output signal of the frequency synthesizer.
- the horizontal axis represents frequency
- the vertical axis represents CN ratio.
- the solid line indicates the wireless communication system A
- the dotted line indicates the wireless communication system B
- the dashed line indicates the wireless communication system C.
- the frequency f A is used, CN ratio and CN A is required.
- the radio communications system B the frequency I beta is used, CN ratio is required CN B
- the radio communications system C the frequency f c is employed, CN ratio when CN C is required I do.
- the figure below shows the CN ratio versus frequency characteristics of the loop filter corresponding to the CN ratio and frequency required in each wireless communication system, and the noise peak of the loop filter is adjusted to achieve the desired CN ratio.
- Frequency ⁇ n is set. As shown in Fig. 3, it can be seen that it is necessary to switch each loop filter to satisfy all the frequencies and CN ratios required in each communication method.
- the mode analysis unit 101 analyzes which wireless communication system is performing communication based on the signal transmitted from the communication partner, and notifies the control unit 102 of the analysis result.
- the control unit 102 controls the first frequency divider 104, the second frequency divider 105, and the switching unit 107 in accordance with the wireless communication scheme currently being communicated. More specifically, the control unit 102 stores a communicable communication method, a frequency division ratio, and loop filter switching information in association with each other, and stores a frequency division ratio and a frequency corresponding to the communication method under communication.
- the switching information is output as control information.
- the reference signal output from the reference signal generator 103 is frequency-divided by the control information output from the control unit 102, that is, the frequency division ratio corresponding to the communication system under communication.
- the signal output from the voltage controlled oscillator 109 is divided by the frequency division ratio according to the control information of the control unit 102. It is. The divided signals are output to the phase comparator 106.
- the phase comparator 106 calculates the phase difference between the signals output from the first frequency divider 104 and the second frequency divider 105, and outputs a voltage (control voltage) corresponding to the phase difference. Is done.
- the voltage corresponding to this phase difference is supplied to the voltage-controlled oscillator 109 via any one of the switching unit 107 and the loop filter 108-1-1 to 108-1N, and the voltage is adjusted so that the phase difference disappears. Controls the control oscillator 109.
- the switching unit 107 based on the switching information notified from the control unit 102 (here, the switching information indicates the loop filter 108-1), the switching unit 107 supplies the switching unit 106 with the phase comparator 106. The applied voltage is supplied to the loop filter 108-8-1.
- the noise peak frequency ⁇ n corresponding to the communication system currently in communication is set, and the voltage applied from the switching unit 107 is filtered (smoothed) and filtered.
- the applied DC voltage is applied to the voltage controlled oscillator 109.
- the voltage-controlled oscillator 109 oscillates a frequency corresponding to the voltage given from the loop filter 108-1, and forms a signal having a CN ratio and a frequency required by the communication system during communication. As a result, good communication quality can be ensured in each communication method.
- a loop filter for realizing a CN ratio required in a plurality of wireless communication systems is prepared, and by switching to a loop filter according to a communication system in communication, a plurality of loop filters are provided. It is possible to realize a single frequency synthesizer corresponding to the communication system, to reduce the size of the device, and to avoid deterioration of the communication quality in each communication system.
- FIG. 4 is a block diagram showing a configuration of a frequency synthesizer according to Embodiment 2 of the present invention. However, parts in FIG. 4 common to FIG. 2 are denoted by the same reference numerals as in FIG. 2, and detailed description thereof will be omitted.
- FIG. 4 differs from FIG. 2 in that the mode analysis unit 101 is changed to a transmission rate analysis unit 301, and that the loop filter 108-8 This is the point where 1 08—N is changed to a loop filter 3 0 2—1 to 3 0 2—N.
- the transmission rate analysis unit 301 analyzes the transmission rate of the signal transmitted from the communication partner based on the information included in the signal.
- the transmission rate changes, for example, according to the bandwidth of the signal, and the CN ratio changes according to the bandwidth. Specifically, when the transmission rate is high, the bandwidth is wide and the CN ratio tends to decrease. Conversely, when the transmission rate is low, the bandwidth is narrow and the CN ratio tends to improve.
- the specified communication system is notified to the control unit 102. Note that the transmission rate angle analyzer 301 and the controller 102 function as control means.
- the noise peak frequency ⁇ n is set in each of the loop filters 302-1 to 300 -N so as to realize a CN ratio corresponding to a predetermined transmission rate. Is smoothed (averaged), and the DC voltage obtained by smoothing is applied to the voltage-controlled oscillator 109.
- a plurality of loop filters for realizing a CN ratio corresponding to the transmission rate of a signal transmitted from a communication partner are prepared, and a loop filter corresponding to the transmission rate during communication is prepared.
- FIG. 5 is a block diagram showing a configuration of a frequency synthesizer according to Embodiment 3 of the present invention.
- FIG. 5 differs from FIG. 2 in that the mode analysis unit 101 is changed to the adaptive modulation analysis unit 401, and the loop filters 108-1-1 to 108-N are replaced with the loop filter 400-2. This is the point changed to 1-402-N.
- Adaptive modulation analysis section 401 analyzes which modulation scheme the signal transmitted from the communication partner has been transmitted based on information included in the signal.
- the CN ratio tends to decrease when the modulation level is high (for example, 16 Q AM), and the CN ratio when the modulation level is low (for example, QPSK). Tend to improve.
- the specified communication system is notified to the control unit 102.
- the adaptive modulation analysis unit 401 and the control unit 102 function as control means.
- the noise peak frequency ⁇ n is set in each of the loop filters 402-1 to 402 -N so as to realize a CN ratio corresponding to a predetermined modulation method (modulation multi-level number).
- the voltage supplied from the switching unit 107 is smoothed (averaged), and the smoothed DC voltage is supplied to the voltage controlled oscillator 109.
- a plurality of loop filters for realizing the CN ratio corresponding to the modulation method of the signal transmitted from the communication partner are prepared, and the loop filter according to the modulation method during communication is prepared.
- a frequency synthesizer includes: a first frequency divider for dividing a reference frequency at a desired frequency division ratio; an oscillator for oscillating a frequency according to a control voltage; and a frequency oscillating by the oscillator.
- a second frequency dividing means for dividing the frequency by a desired frequency dividing ratio; and a phase comparing means for generating a control voltage corresponding to a phase difference of the frequency divided by the first frequency dividing means and the second frequency dividing means.
- a plurality of loop filters each having a different noise peak frequency that determines a frequency at which a noise peak appears when filtering the control voltage generated by the phase comparing means.
- a configuration is provided that includes: a switching unit that performs the switching; and a control unit that monitors a signal transmitted from the communication partner and controls the switching unit based on a monitoring result.
- the oscillation peak frequency is determined by setting the noise peak frequency.
- the stage can oscillate a signal having a frequency corresponding to the signal transmitted from the communication partner, and can set the signal to a desired CN ratio. As a result, even if a different CN ratio is required for each signal transmitted from the communication partner, a single frequency synthesizer corresponding to each signal can be realized, thereby avoiding deterioration of speech quality. The size of the device can be reduced.
- the plurality of loop filters are configured to set a noise peak frequency according to a different wireless communication system
- the control unit determines which one of the plurality of wireless communication systems is a wireless communication system. It is configured to detect whether or not the switching unit is used, and to control the switching unit based on the detection result.
- a frequency synthesizer corresponding to a plurality of wireless communication systems is provided. Can be realized by one, and the size of the device can be reduced.
- the plurality of loop filters are set to noise peak frequencies corresponding to different transmission rates, and the control unit detects a transmission rate of a signal transmitted from a communication partner.
- a configuration is employed in which the switching means is controlled based on the detection result.
- a frequency synthesizer corresponding to a plurality of transmission rates is provided. Can be realized by one, and the size of the device can be reduced.
- the plurality of loop filters may set a noise peak frequency according to a different modulation scheme, and the control unit 1 may detect a modulation scheme of a signal transmitted from a communication partner.
- a configuration for controlling the switching means based on the result is adopted.
- a plurality of loop filters for realizing a CN ratio corresponding to the modulation scheme of the signal are switched according to the modulation scheme during communication, A single frequency synthesizer that supports a plurality of modulation schemes can be realized, and the scale of the device can be reduced.
- a wireless communication apparatus includes a first frequency dividing means for dividing a reference frequency by a desired frequency dividing ratio, an oscillating means for oscillating a frequency according to a control voltage, and a frequency oscillated by the oscillating means.
- a second frequency dividing means for dividing the frequency by a desired frequency dividing ratio; and a phase comparing means for generating a control voltage corresponding to a phase difference between the frequencies divided by the first frequency dividing means and the second frequency dividing means.
- a plurality of loop filters each having a different noise peak frequency for determining a frequency at which a noise peak appears when filtering the control voltage generated by the phase comparing means; and switching between the loop filters.
- a control means for monitoring a signal transmitted from a communication partner and controlling the switching means based on a monitoring result.
- the noise peak frequency is an element that affects the CN ratio of the signal oscillated by the oscillating means. While oscillating a signal of the corresponding frequency, the signal can be set to a desired CN ratio. As a result, even if a different CN ratio is required for each signal transmitted from the communication partner, a single frequency synthesizer corresponding to each signal can be realized, thereby avoiding deterioration of speech quality. The size of the device can be reduced.
- a loop filter for realizing each CN ratio corresponding to a signal transmitted from a communication partner is prepared, and the loop filter is switched according to the transmitted signal.
- the present invention is suitable for use in, for example, a wireless communication device supporting a plurality of wireless communication systems.
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Abstract
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003161270A JP2004364055A (ja) | 2003-06-05 | 2003-06-05 | 周波数シンセサイザ及び無線通信装置 |
| JP2003-161270 | 2003-06-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2004109928A1 true WO2004109928A1 (ja) | 2004-12-16 |
Family
ID=33508601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2004/008005 Ceased WO2004109928A1 (ja) | 2003-06-05 | 2004-06-02 | 周波数シンセサイザ及び無線通信装置 |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2004364055A (ja) |
| WO (1) | WO2004109928A1 (ja) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4445475B2 (ja) | 2006-02-03 | 2010-04-07 | 株式会社東芝 | 発振器、pll発振器、無線装置 |
| JP5251988B2 (ja) * | 2009-01-28 | 2013-07-31 | 日本電気株式会社 | 両偏波伝送システム、両偏波伝送方法、受信装置、送信装置、受信方法、及び送信方法 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02141127A (ja) * | 1988-11-22 | 1990-05-30 | Nec Corp | 周波数制御回路 |
| JPH02203622A (ja) * | 1989-02-01 | 1990-08-13 | Nippon Telegr & Teleph Corp <Ntt> | 多元周波数位相同期回路 |
| WO1998047232A1 (fr) * | 1997-04-14 | 1998-10-22 | Mitsubishi Denki Kabushiki Kaisha | Synthetiseur de frequence a boucle a phase asservie et terminal portable utilisant ce synthetiseur de frequence a boucle a phase asservie |
-
2003
- 2003-06-05 JP JP2003161270A patent/JP2004364055A/ja active Pending
-
2004
- 2004-06-02 WO PCT/JP2004/008005 patent/WO2004109928A1/ja not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02141127A (ja) * | 1988-11-22 | 1990-05-30 | Nec Corp | 周波数制御回路 |
| JPH02203622A (ja) * | 1989-02-01 | 1990-08-13 | Nippon Telegr & Teleph Corp <Ntt> | 多元周波数位相同期回路 |
| WO1998047232A1 (fr) * | 1997-04-14 | 1998-10-22 | Mitsubishi Denki Kabushiki Kaisha | Synthetiseur de frequence a boucle a phase asservie et terminal portable utilisant ce synthetiseur de frequence a boucle a phase asservie |
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| Publication number | Publication date |
|---|---|
| JP2004364055A (ja) | 2004-12-24 |
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