WO2006112410A1 - 通信装置、それを搭載した非接触型icカード、および情報機器 - Google Patents
通信装置、それを搭載した非接触型icカード、および情報機器 Download PDFInfo
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- WO2006112410A1 WO2006112410A1 PCT/JP2006/307966 JP2006307966W WO2006112410A1 WO 2006112410 A1 WO2006112410 A1 WO 2006112410A1 JP 2006307966 W JP2006307966 W JP 2006307966W WO 2006112410 A1 WO2006112410 A1 WO 2006112410A1
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- Prior art keywords
- circuit
- mode
- capacitor
- output terminal
- transmission
- Prior art date
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- 238000004891 communication Methods 0.000 title claims abstract description 108
- 239000003990 capacitor Substances 0.000 claims abstract description 133
- 238000000034 method Methods 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims description 168
- 230000006870 function Effects 0.000 claims description 85
- 239000000872 buffer Substances 0.000 claims description 53
- 238000012545 processing Methods 0.000 claims description 11
- 230000004044 response Effects 0.000 claims description 2
- 239000000969 carrier Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 31
- 238000013461 design Methods 0.000 description 6
- 238000004088 simulation Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000013256 coordination polymer Substances 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/22—Capacitive coupling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/24—Inductive coupling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/77—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for interrogation
Definitions
- the present invention relates to a communication device that can be mounted on a non-contact type IC card, a non-contact type IC card that includes the communication device, and an information device such as a mobile phone.
- Non-contact type IC cards are disclosed in Patent Documents 1 and 2, for example.
- FIG. 1 is a diagram showing a configuration of a front end circuit 10 of a general non-contact type IC card RZW (reader Z writer) device.
- RZW reader Z writer
- the main parts of the front-end circuit 10 of this non-contact type IC card RZW device are a reception system circuit 11, a transmission system circuit 12, a series resonance capacitor 13, an RZW antenna 14 Etc.
- the resistor 15 is an internal resistance of the (antenna) coil 16.
- C1 indicates the capacitance of the capacitor 13
- R1 indicates the resistance value of the resistor 15
- L1 indicates the inductance of the coil 16, respectively.
- a modulated wave signal is output from the transmission system circuit 12, a current flows through the capacitor 13 connected in series with the antenna 14 and the coil 16 forming the antenna 14, and a magnetic field is radiated from the antenna 14. .
- the carrier signal received by the reception system circuit 11 is a signal with a load modulation force S. It is possible to receive the demodulated data and extract the demodulated data.
- the capacitor 13 and the coil 16 form a resonance circuit. At this time, the impedance viewed from the transmission system circuit 12 becomes small (a lot of current flows), and the transmission magnetic field from the antenna 14 becomes the largest.
- the front-end circuit 10 at the time of transmission / reception has a coil 16 and a capacitor 13 in series This is a continued circuit configuration.
- the carrier frequency of the signal to be used is set to coincide with the resonance frequency of the coil 16 and the capacitor 13 and has the lowest impedance at the resonance frequency.
- the coil 16 constituting the loop antenna is represented by a resistor 15 including the loss, and forms a series resonance circuit with the capacitor 13.
- the resonance frequency fO is expressed as follows.
- the impedance Z of the antenna circuit at this time is as follows, and the resistance value R1 force of the resistor 15, in which case current can be efficiently passed through the antenna, and the generated magnetic field is maximized.
- FIG. 2 is a diagram showing the configuration of the main part of the front-end circuit used in the non-contact type IC card.
- the main part of the front-end circuit 20 used in the non-contact type IC card is composed of a transmission and reception system circuit 21, a capacitor 22, a card antenna 23, a resistor 24, and the like. .
- C2 indicates the capacitance of the capacitor 22
- R2 indicates the resistance value of the resistor 24
- L2 indicates the inductance of the coil 25! /.
- a resistor 24 and a coil 25 are connected in series, and a capacitor 22 is connected in parallel at both ends thereof, and is set to resonate at a frequency to be used.
- the impedance of the combined circuit of the capacitor 22 connected in parallel with the card antenna 23 has the highest impedance.
- the parallel resonance frequency fO is expressed by the following equation.
- Patent Document 1 Japanese Patent Laid-Open No. 2002-334310
- Patent Document 2 Japanese Patent Laid-Open No. 2004-355212
- the optimal number of circuit configurations for the RZW (reader Z writer) device and the optimal circuit configuration for the card are different. Therefore, one front-end circuit is suitable for satisfying both functions. It is necessary to prepare a separate antenna and front end circuit. This has a high degree of design difficulty, including many front-end components, circuits, and interference due to multiple antennas, and countermeasures are necessary. If one antenna is used, it will be biased toward either the RZW function or the card function, making it difficult to satisfy both characteristics.
- the present invention is a communication device that can share one antenna and can sufficiently exhibit the characteristics of the function and card function as a reader and writer, a non-contact type IC card including the same, and information To provide equipment.
- a communication device includes a first transmission circuit having first and second output terminals and outputting a carrier from the first and second output terminals in the first mode. And the node And an inductor having one end connected to the node and the other end connected to the second output terminal of the first transmission circuit, and between the node and the first output terminal of the first transmission circuit.
- An antenna circuit including at least one capacitor connected to the second circuit, a second transmission circuit connected to the node of the antenna circuit and outputting transmission data in the second mode, and the node of the antenna circuit.
- At least one receiving circuit connected to receive the data received by the antenna circuit, and in the first mode, the antenna circuit is formed as a series resonant circuit including the inductor and capacitor, and the second mode.
- the circuit includes a circuit switching unit that forms the antenna circuit as a parallel resonant circuit including the inductor and a capacitor.
- the non-contact type IC card of the second aspect of the present invention has first and second output terminals, and carrier data is output to the first and second output terminal forces in the reader / writer mode.
- the first transmission circuit, the node, one end connected to the node, the other end connected to the second output terminal of the first transmission circuit, the node and the first transmission An antenna circuit including at least one capacitor connected to the first output terminal of the circuit; and a second circuit connected to the node of the antenna circuit and load-modulating transmission data in the card mode.
- Transmitting circuit at least one receiving circuit connected to the node of the antenna circuit and performing reception processing on the data received by the antenna circuit, and in the reader / writer mode according to a mode control signal
- An antenna circuit is formed as a series resonant circuit including the inductor and a capacitor
- the antenna switching circuit is formed as a parallel resonant circuit including the inductor and the capacitor, a memory, and the transmission
- a control unit that selectively supplies data to the first transmission circuit or the second transmission circuit, performs predetermined processing on the reception data of the reception circuit, and controls access to the memory.
- a third aspect of the present invention is an information device having a communication function with a communication network, and includes a communication device having a reader / writer function and a card function.
- the communication device includes first and second communication devices.
- a first transmission circuit that outputs the first and second output terminal forces in the first mode, a node, one end connected to the node, and the other end connected to the first
- An inductor connected to the second output terminal of the transmission circuit, the node and the first transmission circuit
- An antenna circuit including at least one capacitor connected to the first output terminal of the path, and a second circuit connected to the node of the antenna circuit and outputting transmission data in the second mode.
- a transmitter circuit at least one receiver circuit connected to the node of the antenna circuit for performing reception processing on data received by the antenna circuit; and in the first mode, the antenna circuit is connected in series including the inductor and the capacitor.
- a circuit switching unit that forms the antenna circuit as a parallel resonant circuit including the inductor and a capacitor in the second mode.
- the present invention there is no need to separate the antenna for the reader / writer (RZW) and the card, and only one antenna is sufficient. As a result, problems due to interference between the RZW antenna and the card antenna are eliminated. Since the number of antennas is reduced, the peripheral parts and circuits are reduced, the design is facilitated, and the cost can be reduced. In addition, parts and design costs are low, and a high-performance front-end circuit with a simple configuration can be obtained.
- FIG. 1 is a diagram showing a configuration of a front end circuit of a general non-contact type IC card RZW (reader Z writer) device.
- RZW reader Z writer
- FIG. 2 is a diagram showing a configuration of a main part of a front-end circuit used in a non-contact type IC card.
- FIG. 3 is a diagram showing a configuration example of a communication system to which a mobile phone as a portable information device according to an embodiment of the present invention is applied.
- FIG. 4 is a block diagram showing a basic configuration example of the mobile phone according to the present embodiment.
- FIG. 5 is a diagram showing a first configuration example of a communication apparatus incorporating a non-contact type IC card function and a reader / writer function mounted on the mobile phone according to the embodiment of the present invention.
- FIG. 6 is a diagram showing a second configuration example of a communication device incorporating a non-contact type IC card function and a reader / writer function mounted on the mobile phone according to the embodiment of the present invention. It is a figure which shows the structure at the time of writer mode.
- FIG. 7 is a non-contact type IC card mounted on the mobile phone according to the embodiment of the present invention. It is a figure which shows the 2nd structural example of the communication apparatus which incorporated the function and the reader / writer function, Comprising: It is a figure which shows the structure at the time of card mode.
- FIG. 8 is a diagram showing a third configuration example of a communication apparatus incorporating a non-contact type IC card function and a reader / writer function mounted on the mobile phone according to the embodiment of the present invention.
- FIG. 9 is a diagram showing a fourth configuration example of a communication apparatus with a built-in non-contact IC card function and reader / writer function mounted on the mobile phone according to the embodiment of the present invention.
- FIG. 10 is a diagram showing a simulation result of the communication apparatus shown in FIG.
- FIG. 11 is a diagram showing a simulation result of the communication apparatus shown in FIG.
- FIG. 12 is a diagram showing a fifth configuration example of a communication apparatus with a built-in non-contact IC card function and reader / writer function installed in the mobile phone according to the embodiment of the present invention.
- FIG. 13 is a diagram showing a sixth configuration example of a communication apparatus incorporating a non-contact IC card function and a reader / writer function mounted on the mobile phone according to the embodiment of the present invention.
- FIG. 14 is a diagram showing a seventh configuration example of the communication apparatus with a built-in non-contact IC card function and reader / writer function mounted on the mobile phone according to the embodiment of the present invention.
- FIG. 15 is a diagram showing a configuration example of a non-contact type IC card on which the communication device of FIG. 5 is mounted.
- FIG. 16 is a diagram showing a configuration example of a non-contact type IC card on which the communication device of FIGS. 6 and 7 is mounted.
- FIG. 17 is a diagram showing a configuration example of a non-contact type IC card on which the communication device of FIG. 8 is mounted.
- FIG. 18 is a diagram showing a configuration example of a non-contact type IC card on which the communication device of FIG. 9 is mounted.
- FIG. 19 is a diagram showing a configuration example of a non-contact type IC card on which the communication device of FIG. 12 is mounted.
- FIG. 20 is a diagram showing a configuration example of a non-contact type IC card on which the communication device of FIG. 13 is mounted.
- FIG. 21 is a diagram showing a configuration example of a non-contact type IC card on which the communication device of FIG. 14 is mounted. Explanation of symbols
- [0025] 100 ... communication system, 110 mobile phone, 115 memory unit, 116 "communication device, 117 control unit, 120 contactless IC card, 130 base Station, 140 ⁇ 'Communication network, 150 ⁇ ⁇ ⁇ Server, 200, 200A to 200F' ⁇ 'Communication device, 210, 210A to 210F' ⁇ 'Antenna circuit, 211 ...
- FIG. 3 is a diagram showing a configuration example of a communication system to which a mobile phone as a portable information device according to an embodiment of the present invention is applied.
- a communication system 100 shown in FIG. 3 includes a mobile phone 110, an external contactless IC card 120, a base station 130, a communication network 140, and a server 150.
- the mobile phone 110 of the present embodiment incorporates, for example, a non-contact IC card function and a reader / writer function, and the installed reader / writer (RZW) function is provided from an external non-contact IC card 120.
- RZW reader / writer
- the mobile phone 110 connects to the server 150 from the base station 130 via the communication network 140 by wireless communication according to a predetermined communication method. Relay communication between 120 and server 150.
- FIG. 4 is a block diagram showing a basic configuration example of the mobile phone according to the present embodiment.
- the mobile phone 110 includes a wireless communication unit 111 that performs wireless communication processing with the server 150 via a communication network 140, a display unit 112 that includes a liquid crystal display device (LCD), and the like.
- Operation unit 113 including operation keys such as numeric keys, voice processing unit 114 having a microphone and a speaker for performing voice input processing or voice output processing, a memory unit for storing programs, message data, address data, IC card data, etc.
- the overall function control of the communication device 116 and the mobile phone 110 forming the front-end circuit part for realizing the non-contact type IC card function and the reader / writer function, and the non-contact type IC card function and the reader / writer function Control unit (CP) that performs mode control to achieve the above, predetermined processing for transmission data TD and reception data RD, and access to memory unit 115 corresponding to it U) has 117.
- CP reader / writer function Control unit
- the wireless communication unit 111, the display unit 112, the operation unit 113, the voice processing unit 114, the memory unit 115, and the control unit 117 constitute a telephone unit as a normal mobile phone.
- the communication device 116, the memory unit 115, and the control unit 117 constitute a card function unit that realizes a non-contact type IC card function and a reader / writer function.
- control unit 117 outputs a mode control signal MD (Mode) and transmission data TD to the communication device 116, receives the reception data RD, and performs storage processing in the memory unit 115.
- the memory unit 115 includes a nonvolatile memory such as a flash memory.
- the control unit 117 may be configured to be provided separately for the telephone unit, the card, and the card function unit.
- the reader / writer mode corresponds to the first mode
- the card mode corresponds to the second mode
- FIG. 5 is a diagram showing a configuration example of a communication device incorporating a non-contact type IC card function and a reader / writer function mounted on the mobile phone according to the embodiment of the present invention.
- the communication device 200 in FIG. 5 includes a first transmission circuit for antenna circuit 210, mainly for a reader / writer function.
- Transmitter circuit 220 as a receiver circuit
- reply (card) circuit 230 as a second transmitter circuit for card functions
- receiver circuit 240 switch
- SW10 switch
- the antenna circuit 210 includes a node ND 210, an antenna coil (inductor) 211, and a capacitor 212.
- Ca indicates the capacitance of the capacitor 212
- L11 indicates the inductance of the coil 211! /.
- antenna coil 211 One end of antenna coil 211 is connected to node ND210, and the first electrode of capacitor 212
- One end is connected to the node ND210, and the second electrode (the other end) is connected to the first output terminal 221 of the transmission system circuit 220.
- the other end of the antenna coil 211 is connected to the second output terminal 222 of the transmission system circuit 220.
- the transmission system circuit 220 includes a first output terminal 221, a second output terminal 222, a first transmission buffer 223, a second transmission buffer 224, a switch (SW11) 225, an inverter (INV) 226, And an input terminal 227.
- the first transmission buffer 223 is constituted by a CMOS buffer including a p-channel MOS (PMOS) transistor PT221 and an ⁇ -channel MOS (NMOS) transistor NT221.
- PMOS p-channel MOS
- NMOS ⁇ -channel MOS
- the source of the PMOS transistor PT221 is connected to the power supply potential Vdd, the drain is connected to the drain of the NMOS transistor NT221, and the source of the NMOS transistor NT221 is connected to the reference potential (ground potential) GND.
- the gates of the PMOS transistor PT221 and the NMOS transistor NT221 are connected, an input node ND221 is formed by the connection point, and an output node ND222 is formed by the connection point between the drains of the PMOS transistor PT221 and the NMOS transistor NT221, The output node ND222 is connected to the first output terminal 221.
- the second transmission buffer 224 is configured by a CMOS buffer including a PMOS transistor PT222 and an NMOS transistor NT222.
- the source of the PMOS transistor PT222 is connected to the power supply potential Vdd, the drain is connected to the drain of the NMOS transistor NT222, and the source of the NMOS transistor NT222 is connected to the reference potential (ground potential) GND.
- the gates of the PMOS transistor PT222 and the NMOS transistor NT222 are connected to each other, the input node ND223 is formed by the connection point, and the output node ND224 is formed by the connection point between the drains of the PMOS transistor PT222 and the NMOS transistor NT222, This output node ND224 is connected to the second output terminal 222.
- the switch 225 has a fixed contact a connected to the input node ND221 of the transmission buffer 223, an operating contact b connected to the output terminal of the inverter 226, and an operating contact c connected to the input terminal 227 of the transmission system circuit 220. Speak.
- the switch 225 is switched between a force mode and a reader / writer (RZW) mode by a mode control signal MD (Mode) from a control unit (CPU or the like) 117.
- MD Mode control signal
- the fixed contact a and the operating contact c are connected.
- the fixed contact a and the operating contact b are connected.
- the input terminal of the inverter 226, the input node ND223 of the second transmission buffer 224, and the operation contact c of the switch 225 are connected to the input terminal 227.
- the input terminal 227 is connected to the fixed contact a of the switch 270.
- the fixed contact a is connected to the input terminal 227 of the transmission system circuit 220
- the operating contact b is connected to the output terminal of the carrier generator 260
- the operating contact c is connected to the power supply potential Vdd. It has been.
- the switch 270 is switched between the force mode and the reader / writer (RZW) mode by a mode control signal MD (Mode) from the control unit (CPU, etc.) 117.
- MD Mode control signal
- the fixed contact a and the operating contact c are connected.
- the fixed contact a and the operating contact b are connected.
- the input terminal 227 is connected to the power supply potential Vdd via the switch 270 and is fixed at the high (Hi) level.
- the NMOS transistors NT221 and NT222 of the first and second transmission buffers 223 and 224 are held in the on state, and the PMOS transistors PT221 and 222 are held in the off state.
- the antenna circuit 210 equivalently forms a parallel resonant circuit.
- a carrier having a frequency of 13.56 MHz generated by the carrier generator 260 via the switch 270 and the input terminal 227 is supplied at the Hi level or the Low level.
- the antenna circuit 210 forms a series resonant circuit.
- the PMOS transistor PT221 When the carrier is at the Lo level, the PMOS transistor PT221 is held in the off state and the NMOS transistor NT221 is held in the on state in the first transmission buffer 223 by the carrier via the inverter 226.
- the second transmission buffer 224 the PMOS transistor PT222 is held in the on state, and the NMOS transistor NT222 is held in the off state.
- the first output terminal 221 is connected to the ground potential GND, and the second output terminal 222 is connected to the power supply potential Vdd. Therefore, the antenna circuit 210 forms a series resonance circuit.
- the carriers by the transmission buffers 223 and 224 of the transmission system circuit 220 are transferred from the control unit 117 and ASK-modulated by the transmission data TD supplied via the switch 250, so that the first and second Are output from the output terminals 221 and 223 to the antenna circuit 210.
- the first and second transmission buffers 223 and 224 of the transmission system circuit 220 form the resonance circuit of the antenna circuit 210 as a parallel resonance circuit or a series resonance circuit.
- the circuit switching unit 280 functions.
- the communication device 200 of FIG. 5 is configured to ground the capacitor 212 of the antenna circuit 210 using the NMOS switches NT221 and NT222 of the transmission buffers 223 and 2 24 used in the reader / writer mode. Has been.
- the terminals A and B in the figure of the antenna circuit 210 are connected to the transmission system circuit 220 in the LSI. Since it is connected to the transmission buffers 223 and 224, in the reader / writer mode, if the ON (ON) resistance of the transmission buffers 223 and 224 is ignored, the transmission buffers 223 and 224 become 0 V with respect to the antenna circuit 210.
- the IC power supply voltage Vdd is output alternately.
- the NMOS transistors NT221 and NT222 are turned ON to be grounded to the ground potential GND.
- the IC terminal voltage will always fall within the range of 0 to V dd, which has the great feature that the switch can be built in a low withstand voltage process. ing.
- reply circuit 230 performs load modulation on the reply data read from memory section 115 in control section 117 and applies it to node ND210 of antenna circuit 210.
- the reception system circuit 240 is also used as a reception circuit when the card function is used (card mode) and as a reception circuit when the reader / writer function is used (reader / writer mode).
- the reception system circuit 240 demodulates the information received during the card function and the reader / writer function, and outputs the reception data RD to the control unit 117.
- the fixed contact a is connected to the supply line of the transmission data TD of the control unit 117 such as a CPU
- the operation contact c is connected to the input of the reply (card) circuit 230
- the operation contact is the transmission system circuit. It is connected to 220 input terminal 227.
- the switch 250 is switched between a card mode and a reader / writer (RZW) mode by a mode control signal MD (Mode) from the control unit 117.
- MD Mode control signal
- the switch 250 is switched to the connection of the fixed contact a to the other working contact c by the mode control signal MD, and the transmission data (reply data) TD returns (card) circuit 230 Is applied to the antenna circuit 210 after being subjected to load modulation by the reply (card) circuit 230.
- the switch 250 is switched to the connection of the other operating contact b by the mode control signal MD, and the transmission data TD is sent to the transmission system circuit 220. Supplied.
- Transmission data is transmitted from the antenna circuit 210 via the transmission system circuit 220.
- the antenna coil 211 and the capacitor 212 forming the antenna circuit 210 are used in both the card mode and the reader / writer mode.
- the resonant circuit dedicated to the card function and the resonant circuit dedicated to the reader / writer function are configured by two.
- the antenna coil 211 is switched by switching the resonant circuit by the circuit switching unit 280.
- a capacitor 212 and a parallel resonance circuit for the card function and a series resonance circuit for the reader / writer function are realized.
- FIG. 5 shows a case where the transmission buffer of the transmission system circuit 220 is used when operated as a reader / writer (RZW) device, and shows an example in which two transmission buffers (Buff) are controlled in phase. is there.
- the parallel resonant circuit is realized by turning on the NMOS side of the CMOS buffer.
- the fixed contact a of the switch 225 of the transmission system circuit 220 is connected to the operation contact c by the mode control signal MD.
- the switch 250 of the communication device 200 the fixed contact a and the operating contact c are connected by the mode control signal MD.
- the input terminal 227 of the transmission system circuit 220 is connected to the power supply potential Vdd via the switch 270. That is, the input terminal 227 is fixed at the Hi (high) level, and this Hi level signal is supplied from the terminal c of the switch 225 to the gate of the NMOS transistor NT211 of the first transmission buffer 223 through the terminal a.
- the NMOS transistor NT221 is turned on.
- the gate potential of the PMOS transistor PT221 constituting the CMOS buffer is high, the PMOS transistor PT221 is turned off.
- the Hi level signal is supplied to the gate of the NMOS transistor NT222 of the second transmission buffer 224, and is turned on. Since the gate of the PMOS transistor PT222 constituting the CMOS inverter is at a high level, it is turned off.
- the NMOS transistor NT221 of the transmission buffer 223 is ON, the second electrode side terminal A of the capacitor 212 is equivalently grounded although there is an ON resistance.
- the other terminal of the antenna coil 211 is also connected to the NMOS transistor N of the transmission buffer 224. Since T222 is ON, the ON resistance is grounded equivalently to the existing force.
- the second electrode side terminal A of the capacitor 212 and the terminal B on the other side of the antenna coil 211 are connected in an AC manner, and as a result, a parallel resonant circuit is formed.
- the parallel resonance circuit is formed by grounding the terminals A and B of the antenna circuit 210 with the NMOS transistors NT221 and NT222 of the transmission buffers 223 and 224 of the transmission system circuit 220 and forming the parallel resonance circuit. Receiving radio waves with the circuit impedance set to high impedance.
- the fixed contact a of the switch 225 of the transmission system circuit 220 is connected to the operation contact b by the mode control signal MD.
- the switch 250 of the communication device 200 is connected to the fixed contact a and the operating contact b by the mode control signal MD.
- the transmission data TD is supplied to the transmission system circuit 220 to perform ASK modulation transferred from the control unit 117.
- the fixed contact a and the operating contact b are connected by the mode control signal MD. Therefore, the carrier generated by carrier generator 260 is input to input terminal 227 of transmission system circuit 220.
- Hi (high) level carrier is supplied to the input terminal 227 of the transmission system circuit 220.
- This Hi-level carrier is input to the inverter 226, and its output becomes Lo (low) level.
- the output is supplied to the gate of the PMOS transistor PT221 of the transmission buffer 223, and the PMOS transistor PT221 is turned on.
- the gate of the NMOS transistor NT221 of the transmission buffer 223 is in the OFF state because it is at Lo level.
- the gate of the NMOS transistor NT222 of the transmission buffer 224 is at the Hi level, the NMOS transistor NT222 is turned on and the PMOS transistor PT222 is turned on. F state.
- a Lo (low) level carrier is supplied to the input terminal 227.
- this Lo level carrier is input to the inverter 226, its output becomes Hi (high) level, and when it is supplied to the gate of the PMOS transistor PT221 of the transmission buffer 223, the PMOS transistor PT221 is turned off.
- the gate of the NMOS transistor NT221 of the transmission buffer 223 is at the Hi level, it is turned on.
- the gate of the NMOS transistor NT222 of the transmission buffer 224 is at the Lo level, the NMOS transistor NT222 is turned off and the PMOS transistor PT222 is turned on.
- high-frequency current flows from the power source via the source and drain of the PMOS transistor PT222 of the transmission buffer 224 to the antenna coil 211, the Canon 212, and the drain and source of the NMOS transistor NT221 of the transmission buffer 223 and GND.
- the radio wave induced by the Lo-level high-frequency current (signal) flowing through the antenna coil 211 is radiated, and the ASK-modulated signal is transmitted to an external non-contact type IC card or the like.
- the capacitor 212 and the antenna coil 211 are connected in series to the output terminals 221 and 222 of the transmission system circuit 220, and a signal is extracted by causing the radio wave to resonate in series between the capacitor 212 and the antenna coil 21. Supplied to receiving system circuit 240.
- FIG. 6 and FIG. 7 are diagrams showing a second configuration example of the communication device incorporating the non-contact type IC card function and the reader / writer function mounted on the mobile phone according to the embodiment of the present invention.
- Fig. 6 shows the configuration in reader / writer mode
- Fig. 7 shows the configuration in card mode.
- the communication device 200A of FIGS. 6 and 7 is fundamentally different from the communication device 200 of FIG. 5 in that a circuit switching unit 280A is arranged between a terminal A and a terminal B of the antenna circuit 210A, and a switch 281 is disposed.
- the switch is configured to be turned on and off by the mode control signal MD.
- the transmission system circuit 220A has output terminals 221A and 222A of normal phase and reverse phase.
- the IC terminal voltage must be within the range of 0 to Vdd in both the reader / writer (RZW) mode and card mode, and the switch can be built in a low withstand voltage process. It has a big feature.
- the switch 250 and 270 are connected to the fixed contact a and the fixed contact b by the mode control signal MD, and the transmission data and the carrier are input to the transmission system circuit 220A.
- the switch 281 of the circuit switching unit 280A is set to OFF so that the antenna circuit 210A becomes a series resonance circuit.
- the impedance is zero at the carrier frequency used for transmission and reception, for example, 13.56 MHz, the current flowing through the antenna coil 211 is maximized, and the reception and transmission distance is extended. In addition, the efficiency of reading and writing is improved.
- Examples of the switch 281 for switching the resonance circuit described above include a transistor such as a MOSFET, MEMS (Micro Electro Mechanical Systems), and a mechanical switch.
- the carrier is modulated with recording data in the modulation circuit, and the modulated carrier is transmitted to the capacitor 212 of the antenna circuit 210 and the series resonance circuit of the antenna coil 211 via the transmission circuit 220A. Supplied. Then, the carrier is radiated through the antenna coil 211 and output to an external non-contact type IC card or the like. At this time, the capacitor 212 and the antenna coil 211 constituting the antenna circuit 210 are in a series resonance state at the used frequency, and the impedance is zero. The current flowing through 11 is the maximum. As a result, transmission efficiency increases and the reach of radio waves increases.
- the output terminals 221A and 22A of the transmission system circuit 220A are set to HiZ (Noise Impedance) so that the antenna circuit 210A is not affected. Is set to Note that the output terminals 221A and 222A of the transmission system circuit 220A can be configured to be set to LoZ (low impedance) in phase. That is, in the card mode, the mode control signal MD is supplied from the control unit 117, the switch 281 of the circuit switching unit 280A is turned ON, and the output terminals 221A and 222A of the positive and negative phases of the output of the transmission circuit 220A Is short-circuited.
- the capacitor 212 and the antenna coil 212 constitute a parallel resonance circuit.
- the switch 250 is switched to the connection between the fixed terminal a and the operating contact c, and transmission data (reply data) TD is supplied to the reply (card) circuit 220.
- the signal transmitted from the external reader / writer device resonates in the parallel resonance circuit of the antenna coil 211 and the capacitor 212, and the extracted signal is input to the reception system circuit 240.
- the output terminals 221A and 222A of the transmission system circuit 220A are short-circuited, no signal is output from the transmission system circuit 220A or the operation of the transmission system circuit 220A is stopped. .
- the transmission signal (information) of the reader / writer device is extracted from the received magnetic field by the demodulation circuit, decoded and output to the control unit 117 such as a CPU.
- the control unit 117 the decoded data is processed, data is stored in or read from the memory unit 115, or data read from the memory unit 115 is encoded.
- the transmission data is subjected to load modulation by the return circuit 230 with respect to the carrier signal from the reader / writer device.
- the switch 281 of the circuit switching unit 280A when used as a card, as shown in FIG. 7, the switch 281 of the circuit switching unit 280A is turned on, and the antenna coil 211 and the capacitor 212 are connected in parallel. At the same time, make the front end relatively high impedance. So that the card functions can be fulfilled even at a greater distance.
- reception system circuit 240 can be configured separately from a reception system circuit dedicated to the card mode and a dedicated reception system circuit in the reader / writer mode.
- FIG. 8 is a diagram showing a third configuration example of a communication device incorporating a non-contact type IC card function and a reader / writer function mounted on the mobile phone according to the embodiment of the present invention.
- the communication device 200B in FIG. 8 is different from the communication device 200A in FIG. 6 and FIG. 7 in that the circuit switching unit 280B is replaced with the switch 281 between the terminal A and the terminal B of the antenna circuit 210B. This is because switches 282 and 283 for selectively connecting terminals A and B to the ground potential by the mode control signal MD are provided.
- each circuit in the reader / writer mode, each circuit operates in a state where the switches 282 and 283 of the circuit switching unit 280B are set to OFF (open) by the mode control signal MD.
- a series resonant circuit is formed in antenna circuit 210B.
- Transmission data and a carrier are input to transmission system circuit 220A during transmission.
- the carrier is ASK modulated with transmission data by transmission system circuit 220A (modulation circuit), and this modulated signal carrier is serially resonated by capacitor 212 and antenna coil 211 of antenna circuit 210B, via antenna coil 211. Sent out.
- the transmission system circuit 220A outputs a fixed carrier, and a load-modulated signal is supplied to the reception system circuit 240 from an external non-contact type IC card.
- the switches 282 and 283 connected to the resonance circuit of the antenna circuit 210B are switched, and in this case, the switch is opened and the series resonance circuit is configured.
- switch 2 82, 283 of circuit switching unit 280B is set to ON by mode control signal MD, and positive phase output (terminal) 221A of transmission system circuit 220A is connected to ground potential GND.
- reverse-phase output (terminal) 222A is also connected to ground potential GND.
- a node ND210 which is a common connection point between the capacitor 212 and the antenna coil 211, is connected to the reception system circuit 240 for card reception, and is set to operate as a card function.
- the switch 250 is switched to the connection between the fixed contact a and the working contact c by the mode control signal MD, the transmission data is supplied to the reply circuit 230, and load modulation is applied to the carrier of the reader / writer device power. Done.
- the switches 282 and 283 connected to the resonance circuit of the circuit switching unit 280B are switched, and in this case, they are short-circuited to form a parallel resonance circuit.
- FIG. 9 is a diagram showing a fourth configuration example of a communication device incorporating a non-contact type IC card function and a reader / writer function mounted on the mobile phone according to the embodiment of the present invention.
- the communication device 200C in FIG. 9 differs from the communication device 200A in FIGS. 6 and 7 in that the antenna circuit 210C is connected to the antenna coil 211 in parallel with the capacitor 213 having a capacitance Cb. It is to have done.
- a capacitor 213 connected in parallel to the antenna coil 211 is provided! /,! /.
- the communication device 200C of FIG. 9 by adjusting the capacitance Cb of the capacitor 213 and the capacitance Ca of the capacitor 212, the card function and the reader / writer function can be achieved even if there is an ON resistance in series with the antenna coil 211 at the resonance frequency. I am satisfied.
- the components other than the antenna circuit 210C are the same as those in FIGS. 6 and 7, and thus detailed description thereof is omitted.
- the positive phase output terminal 221A of the transmission system circuit 210A is connected to one terminal A of the capacitor 212, and the negative phase terminal 222A is connected to the terminal B on the other side of the antenna coil 211 and one terminal (first electrode) of the capacitor 213. Connected. The other terminal (second electrode) of the capacitor 213 is connected to the node ND210.
- the receiving system circuit 240 may be either a reader / writer or a card, but will be described as a card receiving system for convenience.
- Switch circuit 280 Switch A 281 is connected between the positive phase output terminal 221 A and the negative phase terminal 222A of the transmission system circuit 220A.
- the parallel resonance circuit or series resonance circuit is configured to be set to V or a deviation.
- switch 281 is set to OFF by mode control signal MD, and a series resonant circuit is formed in antenna circuit 210C.
- the carrier flows through the transmission system circuit 220A to the capacitor 212 and the antenna coil 211 of the antenna circuit 210C, and further to the capacitor 213, and is transmitted as a radio wave from the antenna coil 211 to perform a reading operation.
- the signal input from the antenna coil 211 is extracted by the antenna coil 211, the capacitor 213, and the capacitor 212 that constitute the series resonance circuit, and the extracted signal is supplied to the reception system circuit 240 to perform the reception operation. Is called.
- the switch 281 is set to the ON state, and the capacitor 212, the capacitor 213, and the antenna coil 211 form a parallel resonance circuit. Data is exchanged with the receiving system circuit 240 of the card using this parallel resonant circuit. Since this operation is the same as the operation described in FIG. 6, FIG. 7, FIG. 8, etc., detailed description is omitted.
- the antenna including the antenna coil 211 in the card mode and the reader / writer mode is used.
- the input impedance of the NA circuit 210C will be described.
- Figs. 10 and 11 below show the impedance characteristics in the card mode and the reader / writer mode. Under the condition that the added value of the capacitors 212 and 213 and (Ca + Cb) are constant. The impedance was calculated by changing each value.
- the switch 281 is set to ON, and a parallel resonant circuit is formed.
- Fig. 10 shows the relative values of the simulation results for the impedance of the circuit, assuming that switch 281 has an ON resistance.
- the horizontal axis in Fig. 10 shows the capacitance values when the capacitances Ca and Cb of the capacitors 212 and 213 are changed, and the vertical axis shows the impedance Z on an arbitrary scale.
- the capacitance Ca of the capacitor 212 is reduced and the capacitance Cb of the capacitor 213 is increased, the impedance Z increases, and if the ON resistance of the force switch suitable for the card mode is large, the impedance decreases. Reception efficiency is reduced. When the ON resistance is large, the values of the capacitances Ca and Cb are large, which may affect the impedance.
- the switch 281 is set to the OFF state, and the impedance is adjusted by adjusting the capacitance Ca of the capacitor 212 and the capacitance Cb of the capacitor 213.
- the horizontal axis shows the values when the capacitances Ca and Cb of the capacitors 212 and 213 are changed, and the vertical axis shows the value of the impedance Z of the series resonant circuit on an arbitrary scale.
- the impedance Z increases, and when exceeding a certain range, the impedance Z increases rapidly, which is suitable for a reader / writer.
- the simulation results of FIGS. 10 and 11 described above show the impedance characteristics of the card mode and the reader / writer mode.
- FIG. 12 is a diagram showing a fifth configuration example of a communication apparatus with a built-in non-contact IC card function and reader / writer function mounted on the mobile phone according to the embodiment of the present invention.
- the communication device 200D in FIG. 12 differs from the communication device 200C in FIG. 9 in that instead of connecting one capacitor 212 between the node ND210 and the terminal A, two capacitors 212-1 and 212 are connected. -2 is connected in series, and the switch 214, which is turned ON / OFF by the mode control signal MD, is connected between the node ND211 connecting the two capacitors 212-1 and 212-2 and the terminal A, and the node ND211 has a high resistance. It is connected to the power supply potential Vdd via 215.
- the communication device 200C shown in FIG. 9 has a higher tuning frequency even during the card function, so the communication device 200D switches the tuning frequency between the card mode and the reader / writer function. Therefore, the characteristics in the card mode and the reader / writer mode are made equal.
- the capacitor 212-2 is bypassed by the switch 214 so as not to contribute to the tuning.
- switch 214 and switch 281 of circuit switching unit 280A are set to ON by mode control signal MD.
- a parallel resonant circuit is formed by the antenna coil 211 and the capacitors 21 2-1 and 213. Only the Canon 212-1 of the series capacitors 212-1 and 212-2 contributes to the tuning.
- the switch 214 and the switch 281 of the circuit switching unit 280A are set to OFF by the mode control signal MD.
- the series capacitance Ct of the capacitor 212-1 having the capacitance Ctl and the capacitor 2122 having the capacitance Ct2 is obtained.
- a series resonance circuit is formed by the antenna coin 211 and the canisters 212-1, 212-2, 213.
- the potential Vrpd of the node ND211 is lower than the potential Vrx of the node ND210 by the partial pressure of the capacitors 212-1 and 212-2.
- the potential of the node ND210 and the capacitances Ctl and Ct2 of the capacitors 212-1 and 212-2 are selected so that the divided voltage falls within the allowable voltage range.
- the tuning frequency is switched between the card mode and the reader / writer function, and the portable device provided with the communication device having good characteristics in the card mode and the reader / writer mode.
- An information device can be configured.
- FIG. 13 is a diagram showing a sixth configuration example of the communication apparatus incorporating the non-contact IC card function and the reader / writer function mounted on the mobile phone according to the embodiment of the present invention.
- the communication device 200E in FIG. 13 differs from the communication device 200A in FIGS. 6 and 7 in that the node N
- the communication device 200E of this example is configured such that the tuning frequency in the reader / writer mode is higher than the card mode, as with the communication device 200D of FIG.
- the switch 281 is set to OFF by the mode control signal MD.
- the two capacitors 212-1 and 212-2 are connected in series, and the total capacity Ctotal is given by
- the resonance frequency fo in the reader / writer mode increases as follows:
- the resonance frequency is determined by the capacitance Ca of the capacitor 212-1 and the inductance L11 of the antenna coil 211.
- the tuning frequency is switched between the card mode and the reader / writer function, and the portable device equipped with the communication device having good characteristics in the card mode and the reader / writer mode.
- An information device can be configured.
- FIG. 14 is a diagram showing a seventh configuration example of a communication apparatus with a built-in non-contact IC card function and reader / writer function mounted on the mobile phone according to the embodiment of the present invention.
- Communication device 200F in FIG. 14 differs from communication device 200E in FIG. 13 in that, instead of connecting one capacitor 212 between node ND210 and terminal A, operation of terminal A and switch 281 is performed. This is because another capacitor 212-3 having a capacitance Cc is further connected between the contact and the contact. Unlike the communication device 200E of FIG. 13, the communication device 200F in this example is configured such that the tuning frequency in the reader / writer mode is lower than that in the card mode.
- the resonance frequency is determined by the capacitance Ca of the capacitor 212-1 and the inductance L11 of the antenna coil 211.
- switch 281 is set to ON by mode control signal MD.
- the resonance frequency fo in the reader / writer mode increases as follows.
- the tuning frequency is switched between the card mode and the reader / writer function, and the portable device having the communication device with good characteristics in the card mode and the reader / writer mode is provided.
- An information device can be configured.
- the communication device incorporating the card function and the reader / writer function does not need to be divided into the antenna for the reader / writer and the card, and only one is required. As a result, problems due to interference between the reader / writer W antenna and the card antenna are eliminated.
- the switch in this embodiment can be realized by a normal CMOS process, and can be mounted on a small-sized portable device.
- FIGS. A non-contact type IC card including the communication device shown in FIG. 6 (FIG. 7), FIG. 8, FIG. 9, FIG. 12, FIG.
- the contactless IC cards 300 and 300A to 300F shown in FIGS. 15 to 21 are configured in the communication devices shown in FIGS. 5, 06 (07), FIGS. 8, 9, 12, 13, and 14.
- the CPU 310 and the memory 320 are provided.
- a battery or the like is incorporated as a power source in order to realize a reader / writer function.
- a configuration in which the power induced in the antenna circuit is smoothed and used as drive power is possible to adopt a configuration in which the power induced in the antenna circuit is smoothed and used as drive power.
- a resonance circuit corresponding to a mode can be formed with one antenna, peripheral components and circuits can be reduced, design can be facilitated, cost can be reduced, and high performance can be achieved with a simple configuration. Therefore, it can be applied to information devices such as mobile phones and non-contact type IC cards.
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Description
Claims
Priority Applications (2)
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JP2006545341A JP4797991B2 (ja) | 2005-04-15 | 2006-04-14 | 通信装置、それを搭載した非接触型icカード、および情報機器 |
US11/570,566 US7729660B2 (en) | 2005-04-15 | 2006-04-14 | Communication device, non-contact type IC card mounting same, and information apparatus |
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JP2005-118459 | 2005-04-15 | ||
JP2005118459 | 2005-04-15 |
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WO2006112410A1 true WO2006112410A1 (ja) | 2006-10-26 |
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PCT/JP2006/307966 WO2006112410A1 (ja) | 2005-04-15 | 2006-04-14 | 通信装置、それを搭載した非接触型icカード、および情報機器 |
Country Status (3)
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JP (1) | JP4797991B2 (ja) |
CN (1) | CN100568754C (ja) |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2008105477A1 (ja) * | 2007-02-27 | 2008-09-04 | Kyocera Corporation | 携帯電子機器及び磁界アンテナ回路 |
JP2009124546A (ja) * | 2007-11-16 | 2009-06-04 | Sony Corp | 通信装置 |
JP2009176027A (ja) * | 2008-01-24 | 2009-08-06 | Toshiba Corp | 無線通信装置及び無線通信システム |
JP2009199578A (ja) * | 2008-01-22 | 2009-09-03 | Ricoh Co Ltd | 通信装置、通信方法、通信プログラム |
JP2011048600A (ja) * | 2009-08-27 | 2011-03-10 | Casio Computer Co Ltd | リーダライタ装置 |
JP2014117150A (ja) * | 2012-12-05 | 2014-06-26 | Samsung Electronics Co Ltd | 近距離無線通信アンテナマッチングネットワークシステム及びそれを含むユーザー装置 |
CN109874368A (zh) * | 2015-12-18 | 2019-06-11 | 科利耳有限公司 | 双电源 |
Families Citing this family (6)
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CN101978383B (zh) * | 2008-03-20 | 2016-03-23 | 国泰银恩企业有限责任公司 | 用于无接触通信的收发电路和包括这种收发电路的nfc设备或rfid读/写设备 |
JP5803550B2 (ja) * | 2011-10-14 | 2015-11-04 | ソニー株式会社 | アンテナ回路、通信装置、および通信方法 |
WO2014091934A1 (ja) | 2012-12-12 | 2014-06-19 | ソニー株式会社 | 通信装置、通信方法、集積回路、及び、電子機器 |
CN105309039B (zh) * | 2013-09-04 | 2019-09-13 | 联发科技(新加坡)私人有限公司 | 包络提取装置,信号解码装置和短距离非接触通信装置及相关方法 |
FR3074379B1 (fr) * | 2017-11-24 | 2020-11-13 | Continental Automotive France | Lecteur d'authentification pour ouvrant de vehicule automobile |
CN110729901B (zh) * | 2019-09-03 | 2020-08-18 | 深圳市崧盛电子股份有限公司 | 一种供电电源及led光源 |
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- 2006-04-14 WO PCT/JP2006/307966 patent/WO2006112410A1/ja active Application Filing
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JP5000701B2 (ja) * | 2007-02-27 | 2012-08-15 | 京セラ株式会社 | 携帯電子機器及び磁界アンテナ回路 |
US8537055B2 (en) | 2007-02-27 | 2013-09-17 | Kyocera Corporation | Portable electronic device and magnetic antenna circuit |
WO2008105477A1 (ja) * | 2007-02-27 | 2008-09-04 | Kyocera Corporation | 携帯電子機器及び磁界アンテナ回路 |
JP2009124546A (ja) * | 2007-11-16 | 2009-06-04 | Sony Corp | 通信装置 |
JP2009199578A (ja) * | 2008-01-22 | 2009-09-03 | Ricoh Co Ltd | 通信装置、通信方法、通信プログラム |
JP2009176027A (ja) * | 2008-01-24 | 2009-08-06 | Toshiba Corp | 無線通信装置及び無線通信システム |
JP2011048600A (ja) * | 2009-08-27 | 2011-03-10 | Casio Computer Co Ltd | リーダライタ装置 |
JP2014117150A (ja) * | 2012-12-05 | 2014-06-26 | Samsung Electronics Co Ltd | 近距離無線通信アンテナマッチングネットワークシステム及びそれを含むユーザー装置 |
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US10425751B2 (en) | 2015-12-18 | 2019-09-24 | Cochlear Limited | Dual power supply |
US11272300B2 (en) | 2015-12-18 | 2022-03-08 | Cochlear Limited | Dual power supply |
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Also Published As
Publication number | Publication date |
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CN100568754C (zh) | 2009-12-09 |
JP4797991B2 (ja) | 2011-10-19 |
JPWO2006112410A1 (ja) | 2008-12-11 |
CN1969465A (zh) | 2007-05-23 |
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