WO2003084085A1 - Appareil recepteur - Google Patents
Appareil recepteur Download PDFInfo
- Publication number
- WO2003084085A1 WO2003084085A1 PCT/JP2003/003274 JP0303274W WO03084085A1 WO 2003084085 A1 WO2003084085 A1 WO 2003084085A1 JP 0303274 W JP0303274 W JP 0303274W WO 03084085 A1 WO03084085 A1 WO 03084085A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- frequency
- switched capacitor
- receiver
- frequency divider
- Prior art date
Links
Classifications
-
- 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
-
- 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
- H04B1/30—Circuits for homodyne or synchrodyne receivers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/007—Demodulation of angle-, frequency- or phase- modulated oscillations by converting the oscillations into two quadrature related signals
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H19/00—Networks using time-varying elements, e.g. N-path filters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H19/00—Networks using time-varying elements, e.g. N-path filters
- H03H19/004—Switched capacitor networks
-
- 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
Definitions
- the present invention relates to a receiver for receiving various signal bands such as a signal band of a mobile phone and a signal band of a bright radio.
- various receiving methods such as a superheterodyne method and a direct conversion method are known as methods for receiving various wireless signals such as a signal band of a mobile phone and a signal band of a radio.
- the superheterodyne method is a reception method in which a received signal is temporarily converted to an intermediate frequency signal, and then converted to a baseband signal.
- a receiver adopting the super- ⁇ terodyne method receives received signals in various frequency bands, the receiver performs processing for an intermediate frequency signal according to the received signal. It is necessary to process wideband signals.
- the receiver is required to pass signals through two intermediate frequency bands, AM reception and FM reception.
- a wide band-pass filter is required.
- Such a receiver that handles a plurality of intermediate frequency signals has a problem that the configuration is complicated and the entire receiver becomes large.
- a direct conversion method is known as a receiving method that can simplify the receiver and reduce the size.
- This direct conversion method is a reception method in which a received signal is directly converted into a baseband signal by mixing the received signal and a signal having the same frequency as the received signal.
- Such a direct conversion receiver does not use an intermediate frequency, but directly converts the received signal into a baseband signal, which usually results in a superheterodyne receiver RF (Radio Frequency).
- RF Radio Frequency
- a filter for removing an image signal used in the circuit section is not required, and the size can be reduced.
- the direct conversion method is receiving attention as a receiving method that can reduce the size of a receiver.
- the receiver uses a wideband signal for signal processing of a baseband signal according to the received signal. Processing is required.
- the conventional receiver has a problem that a filter is configured by passive elements such as a resistor and a capacitor, and that the filter characteristics vary greatly.
- an object of the present invention is to provide a receiver which can easily adapt to various signal bands and is suitable for semiconductor integration in consideration of the above problems. Disclosure of the invention
- a receiver according to a first aspect of the present invention is a receiver that directly converts a received signal into a baseband signal, and filters the baseband signal based on a control signal supplied to a switched capacitor element.
- a switched capacitor filter for controlling a cut-off frequency at the time, an oscillator for generating a periodic signal, and a frequency divider for dividing the periodic signal generated by the oscillator based on the received signal.
- An output signal from a frequency divider is provided as the control signal to the switched capacitor element.
- the first frequency divider is a programmable counter, and is constituted by a frequency divider of an integral multiple or a fractional 1-N frequency divider. You may.
- an arbitrary cutoff frequency can be set, and it is possible to adapt to various reception bands.
- a receiver includes the above-mentioned switched capacitor filter at least an amplifier, and is configured such that a resistance component as a feedback resistor of the amplifier is realized by the above-mentioned switched capacitor element. Is also good.
- a receiver is a receiver that directly converts a received signal into a baseband signal, and includes an oscillator that generates a periodic signal; a periodic signal generated by the oscillator; A mixer that mixes the signal with the signal and outputs a baseband signal.
- a switched capacitor filter for controlling a cut-off frequency when filtering a baseband signal output from the mixer based on a control signal supplied to the switched capacitor element; and a generator generated by the oscillator based on the received signal.
- a frequency divider that divides the divided periodic signal, and an output signal from the frequency divider is provided to the switched capacitor element as the control signal.
- the signal output from the voltage controlled oscillator is frequency-divided by a frequency divider such as a programmable counter, and the frequency-divided signal is used to vary the passband of the switch capacitor filter.
- a circuit for generating a reference frequency signal necessary for varying the pass band of the switched capacitor filter can be omitted, and the receiver can be downsized.
- FIG. 1 is a diagram showing a receiver of the present invention.
- FIG. 2A is a diagram showing a circuit configuration of a switched capacitor filter.
- FIG. 2B is a diagram showing a relationship between a cut-off frequency in a switched capacitor filter and a resistance value of a feedback resistor in a first-order integration type active LPF.
- FIG. 2C is a diagram showing a switched capacitor element.
- FIG. 3A is a diagram for explaining a control operation of a switching operation of the switched capacitor element.
- FIG. 3B is a diagram showing a fractional-N frequency divider.
- FIG. 4 is a diagram showing a configuration of a PLL-type synthesizer for varying the frequency of an oscillation signal output from a local oscillator.
- FIG. 1 is a diagram showing a receiver of the present invention.
- 11 is a direct conversion receiver
- 12 is an antenna
- 13 is a bandpass filter
- 14 is a high-frequency signal amplifier
- 15 is a mixer
- 16 is a mixer.
- 17 indicates a local oscillator (OSL: osci 11 ator in FIG. 1)
- 18 indicates an anti-aliasing filter
- 19 indicates a switched capacitor filter
- 20 Denotes a baseband signal amplifier
- 21 denotes an A / D converter
- 22 denotes a signal processing unit
- 23 denotes a control signal generator.
- the signal processing unit 22 performs various processes (for example, a detection process and a digital filter process) after converting a received signal into a baseband signal, which is shown by one functional block.
- Figure 1 shows an iJ ⁇ AZD converter 21 that converts a signal into a baseband signal and then converts it into a signal.
- it has a cut-off frequency of about 1 m.
- the bandpass filter 13 removes an unnecessary signal
- the high-frequency signal amplifier 14 amplifies the received signal.
- the amplified received signal is converted into two orthogonal signals having phases different from each other by 90 ° by the mixer 15, the 90 ° phase shifter 16, and the local oscillator 17.
- the signal input from the local oscillator 17 to the mixer 15 has the same frequency as the received signal.
- the two orthogonal signals are filtered by an anti-aliasing filter 18 to remove an extra signal in order to prevent aliasing noise generated in the subsequent processing, and input to a switched capacitor filter 19.
- the signal input to the switched capacitor filter 19 has its high-frequency component removed by the switched capacitor filter 19 and is amplified by the baseband signal amplifier 20.
- the signal amplified by the baseband signal amplifier 20 is converted into a digital signal by the A / D converter 21, and predetermined digital signal processing such as detection processing is performed by the signal processing unit 22.
- the direct conversion receiver 11 when directly converting the received signal to a baseband signal, the direct conversion receiver 11 outputs an unnecessary signal (such as an image signal) generated in the received signal. At this time, the signal band of the received signal is received. Therefore, the pass band of the low-pass filter needs to be changed.
- a switched capacitor filter 19 is used as a one-pass filter, and the pass band is changed for each signal band.
- one switched capacitor filter 19 can select from a plurality of signal bands.
- a received signal in a desired signal band can be processed.
- the direct conversion receiver 11 can be downsized.
- FIG. 2A is a diagram showing a circuit configuration of the switched capacitor filter 19.
- the switched capacitor filter 19 is a generally known state variable type active LPF (low-pass filter) (or called a biquad low-pass filter).
- an integrator 25 and an inverting amplifier 26 are added to a secondary biquad active LPF 24 in which a resistor is connected in series to the input side of the operational amplifier, and a closed loop is formed as a whole. Have been.
- the output of the integrator 25 of the switched capacitor filter 19 has the same function as the output of the conventional low-pass filter of the receiver.
- R and C indicate the resistance value of the feedback resistor and the capacitance value of the capacitor in the secondary motorcycle active LPF 24.
- the switched capacitor filter 19 increases the cut-off frequency ⁇ c when the above-mentioned 3 dB drop pass bandwidth ⁇ is large, and lowers the cut-off frequency ⁇ c when the 3-dB drop pass bandwidth ⁇ is small. I do.
- FIG. 2A is a diagram showing the relationship between the cut-off frequency fc in the switched capacitor filter 19 and the resistance value of the feedback resistor R in the first-order integration type active LPF 24.
- the resistance value of the feedback resistor R in the secondary bypass active LPF 24 is reduced. If you want to set a low cut-off frequency fc, use the first-order integration type active Increase the resistance of feedback resistor R in LPF 24.
- the resistance value of the feedback resistor R of the secondary bidd active LPF 24 may be varied.
- FIG. 2C is a diagram showing a switched capacitor element 27 used as a feedback resistor R of the secondary bipod active LPF 24.
- the switched capacitor element 27 is composed of a capacitor 28 and two switch fingers 1 and T2.
- the switch T1 and the switch T2 connected to the capacitor 28 control a certain control signal.
- a resistance element having a resistance value according to the control signal ⁇ is obtained.
- Varying the frequency of the control signal fo, or slow the rate of sweep rate Tsuchingu operation switch T 1 and switch T 2, by or faster, can vary the resistance of the Suitsu tide capacitor element 2 7 it can.
- the cut-off frequency f c of a filter consisting of a capacitor C 1 and a resistor R 1 is
- FIG. 3A is a diagram for explaining a method of generating the control signal fo input to the switches T1 and T2.
- reference numeral 31 denotes a programmable counter.
- the programmable counter 31 outputs a control signal having a frequency f o1 according to the binary value N 1 (an integer multiple) of the frequency f c k of the input signal. At this time, the control signal output from the programmable counter 31 is output based on the signal band of the received signal.
- the switch T1 is closed (the switch 1 is ON) and the switch T2 is opened. (Switch T1 is OFF). As a result, charge is stored in the capacitor 28.
- the switch T1 is opened (the switch ⁇ 1 is OFF) and the switch T2 is closed (the switch T2 is in the ON state). As a result, the electric charge stored in the capacitor 28 is discharged to the switch T2.
- the switched capacitor filter 19 needs to vary the cut-off frequency for each different signal band.
- a binary value such that a low-frequency control signal fo is output from the programmable counter 31 is input to the programmable counter 31.
- a binary value such that a high-frequency control signal ⁇ o is output from the programmable counter 31 is input to the programmable counter 31.
- the resistance value of the switched capacitor element 27 can be changed. It will be possible. Then, by changing the resistance value of the switched capacitor element 27, the cutoff frequency fc of the switched capacitor filter 19 can be changed. It becomes possible.
- FIG. 3B is a diagram showing a fractional-N (Fractio nalNumber) frequency divider.
- reference numeral 32 denotes a fractional-N frequency divider having a dividing value including a value below the decimal point, and is not limited to 1 ZN, and a desired dividing ratio can be arbitrarily set. Is possible.
- the programmable counter 31 has the power to determine the frequency division ratio by an integer multiple of the reference signal.
- This fractional 1-N frequency divider 32 can be used to drop or add pulses to the input reference signal fck.
- the frequency division ratio can be set arbitrarily.
- the switching operation of the switched capacitor element 27 is controlled by inputting the signal ⁇ 2 output from the fractional-N type frequency divider 32 as a control signal to the switched capacitor element 27. In this way, by controlling the switching operation of the switched capacitor element 27 with the signal output from the fractional-frequency divider 32, finer control than with the programmable force counter 31 can be achieved. It becomes possible.
- the direct conversion receiver 11 employs the switched capacitor filter 19 as a low-pass filter for removing unnecessary signals of the baseband signal, thereby receiving various signal bands with a simple configuration. A signal can be received.
- the switched capacitor filter 19 can be formed in a semiconductor integrated circuit, it is possible to reduce the size of the entire circuit.
- a programmable counter 31 / fraction-root frequency divider 32 is used, and data for changing the frequency division ratio is used.
- the cut-off frequency can be easily changed. The number can be changed.
- the form of the direct purge receiver 11 of the present embodiment is not limited to the above-described form.
- the output signal output from the local oscillator 17 may be frequency-divided, and the frequency-divided signal may be used as a control signal for varying the cut-off frequency of the switched capacitor filter 19.
- FIG. 4 is a diagram showing a configuration of a PLL (PhaseLoccedLoop) type synthesizer 41 for varying the frequency of the oscillation signal of the local oscillator 17 in the direct comparison receiver 11.
- PLL PhaseLoccedLoop
- reference numeral 42 denotes a voltage controlled oscillator (VC ⁇ : Votage Controlled Oscillator), and reference numeral 43 denotes a voltage controlled oscillator 42 according to an input binary value (an integer multiple).
- 44 is a programmable counter that divides the frequency of the input signal by an integer, and 44 compares the signal output from the programmable counter 43 with the reference signal fX and calculates a voltage value corresponding to the phase difference.
- Reference numeral 45 denotes a phase comparator to be output, and reference numeral 45 denotes a low-pass filter that removes unnecessary voltage components from the voltage value output from the phase comparator 44 to generate a DC control voltage.
- 46 is a programmable counter that divides the frequency of the signal output from the voltage controlled oscillator 42 to 1 / P
- 47 is the frequency of the reference signal ⁇ ⁇ X output from a crystal oscillator or the like.
- the figure shows a frequency divider that performs fixed frequency division.
- the synthesizer 41 in FIG. 4 is a PLL synthesizer using a generally known programmable power source 43.
- the phase comparator 44 calculates the reference signal ⁇ r output from the frequency divider 47 and the voltage
- the phase of the signal fV output from the control oscillator 42 is compared with the signal fw obtained by dividing the signal fV into 1 Zk by the programmable counter 43, and a voltage corresponding to the phase difference is output.
- the signal fV output from the voltage controlled oscillator 42 is divided by the programmable counter 46 into 1 / P, and the divided signal is divided by the switched capacitor element 27 in the switched capacitor filter 19. It is used to control the ON / OFF switching operation of switch T1 and switch T2.
- the control signal output from the programmable power counter 46 is also used as an oscillation signal for directly converting the received signal into a baseband signal, the binary value input to the programmable counter 46 is It has a certain relationship with the received signal.
- the programmable counter 43 or the programmable counter 46 may be configured as a fractional-N frequency divider.
- the frequency of the control signal input to the switched capacitor filter 19 can be set arbitrarily.
- a switched capacitor filter is employ
- the receiver can be realized with a simple configuration.
- the switch-off frequency can be set to an arbitrary frequency by using a frequency divider or a fractional 1-N programmable power counter for dividing by an integer multiple as a divider.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Filters That Use Time-Delay Elements (AREA)
- Superheterodyne Receivers (AREA)
- Networks Using Active Elements (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03708663A EP1489752A1 (en) | 2002-03-28 | 2003-03-18 | Receiver apparatus |
KR10-2004-7015081A KR20040104544A (ko) | 2002-03-28 | 2003-03-18 | 수신기 |
US10/508,915 US20050176396A1 (en) | 2002-03-28 | 2003-03-18 | Receiver apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002091835A JP2003289264A (ja) | 2002-03-28 | 2002-03-28 | 受信機 |
JP2002-91835 | 2002-03-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003084085A1 true WO2003084085A1 (fr) | 2003-10-09 |
Family
ID=28671688
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/003274 WO2003084085A1 (fr) | 2002-03-28 | 2003-03-18 | Appareil recepteur |
Country Status (7)
Country | Link |
---|---|
US (1) | US20050176396A1 (ja) |
EP (1) | EP1489752A1 (ja) |
JP (1) | JP2003289264A (ja) |
KR (1) | KR20040104544A (ja) |
CN (1) | CN1643802A (ja) |
TW (1) | TW200401512A (ja) |
WO (1) | WO2003084085A1 (ja) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI20065862A0 (fi) * | 2006-06-30 | 2006-12-28 | Nokia Corp | Monitoiminen passiivinen taajuussekoitin |
FI20065464A0 (fi) * | 2006-06-30 | 2006-06-30 | Nokia Corp | Monitoiminen passiivinen taajuussekoitin |
FI20065861A0 (fi) * | 2006-06-30 | 2006-12-28 | Nokia Corp | Signaalien passiivinen vahvistus |
JP2008131383A (ja) * | 2006-11-21 | 2008-06-05 | Sanyo Electric Co Ltd | 音質調整回路及び信号特性調整回路 |
TWI376888B (en) * | 2008-11-26 | 2012-11-11 | Ind Tech Res Inst | Down-conversion filter and communication receiving apparatus |
US9490944B2 (en) * | 2012-10-12 | 2016-11-08 | Innoventure L.P. | Phase sector based RF signal acquisition |
US8995505B2 (en) * | 2012-11-30 | 2015-03-31 | Qualcomm Incorporated | Sliding if transceiver architecture |
CN107493089A (zh) * | 2017-07-18 | 2017-12-19 | 武汉船舶通信研究所(中国船舶重工集团公司第七二二研究所) | 一种低频透地通信接收电路 |
CN112350690A (zh) * | 2020-12-01 | 2021-02-09 | 上海交通大学 | 基于开关电容和有源容阻上变频的高阶n路带通滤波器 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05183342A (ja) * | 1991-12-26 | 1993-07-23 | Toshiba Corp | 受信機 |
JPH05283614A (ja) * | 1992-01-16 | 1993-10-29 | Crystal Semiconductor Corp | 集積回路のキャパシタ構造 |
JPH10215152A (ja) * | 1997-01-30 | 1998-08-11 | Nec Corp | スイッチング用素子の駆動回路 |
JP2000114896A (ja) * | 1998-10-07 | 2000-04-21 | Nec Corp | 利得制御回路及びその制御方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4760346A (en) * | 1986-09-30 | 1988-07-26 | Motorola, Inc. | Switched capacitor summing amplifier |
US5012490A (en) * | 1989-12-26 | 1991-04-30 | At&T Bell Laboratories | Varying bandwidth digital signal detector |
US5487027A (en) * | 1994-05-18 | 1996-01-23 | Lord Corporation | Process and apparatus for providing an analog waveform synchronized with an input signal |
US5774555A (en) * | 1994-08-12 | 1998-06-30 | Samsung Electronics Co., Ltd. | Switched capacitor bandpass filter for detecting pilot signal |
AU2001286475A1 (en) * | 2000-08-11 | 2002-02-25 | Novatel Wireless, Inc. | Method and apparatus for a frequency agile variable bandwidth transceiver |
-
2002
- 2002-03-28 JP JP2002091835A patent/JP2003289264A/ja active Pending
-
2003
- 2003-03-18 EP EP03708663A patent/EP1489752A1/en not_active Withdrawn
- 2003-03-18 WO PCT/JP2003/003274 patent/WO2003084085A1/ja not_active Application Discontinuation
- 2003-03-18 CN CNA038071940A patent/CN1643802A/zh active Pending
- 2003-03-18 KR KR10-2004-7015081A patent/KR20040104544A/ko active IP Right Grant
- 2003-03-18 US US10/508,915 patent/US20050176396A1/en not_active Abandoned
- 2003-03-27 TW TW092106867A patent/TW200401512A/zh unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05183342A (ja) * | 1991-12-26 | 1993-07-23 | Toshiba Corp | 受信機 |
JPH05283614A (ja) * | 1992-01-16 | 1993-10-29 | Crystal Semiconductor Corp | 集積回路のキャパシタ構造 |
JPH10215152A (ja) * | 1997-01-30 | 1998-08-11 | Nec Corp | スイッチング用素子の駆動回路 |
JP2000114896A (ja) * | 1998-10-07 | 2000-04-21 | Nec Corp | 利得制御回路及びその制御方法 |
Also Published As
Publication number | Publication date |
---|---|
KR20040104544A (ko) | 2004-12-10 |
CN1643802A (zh) | 2005-07-20 |
US20050176396A1 (en) | 2005-08-11 |
EP1489752A1 (en) | 2004-12-22 |
JP2003289264A (ja) | 2003-10-10 |
TW200401512A (en) | 2004-01-16 |
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