WO2010032832A1 - Dispositifs d'émission, de réception, d'émission-réception, et procédé d'émission-réception - Google Patents

Dispositifs d'émission, de réception, d'émission-réception, et procédé d'émission-réception Download PDF

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Publication number
WO2010032832A1
WO2010032832A1 PCT/JP2009/066390 JP2009066390W WO2010032832A1 WO 2010032832 A1 WO2010032832 A1 WO 2010032832A1 JP 2009066390 W JP2009066390 W JP 2009066390W WO 2010032832 A1 WO2010032832 A1 WO 2010032832A1
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WIPO (PCT)
Prior art keywords
current
circuit
transmission
voltage
output
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PCT/JP2009/066390
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English (en)
Japanese (ja)
Inventor
浩一 野瀬
正之 水野
源洋 中川
宏一朗 野口
泰弘 森田
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日本電気株式会社
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Priority to JP2010529816A priority Critical patent/JP5360066B2/ja
Publication of WO2010032832A1 publication Critical patent/WO2010032832A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
    • H04B5/48—Transceivers

Definitions

  • the present invention is based on the priority claim of Japanese Patent Application No. 2008-241172 (filed on Sep. 19, 2008), the entire contents of which are incorporated herein by reference. Shall.
  • the present invention relates to a transmission device, a reception device, a transmission / reception device, and a transmission / reception method, and more particularly to an analog signal transmission device, a reception device, a transmission / reception device, and a transmission / reception method.
  • Short-distance non-contact communication technology includes a communication system based on electromagnetic induction between coils (inductors) formed in a chip, a flat plate for each chip, and parallel plate capacitors (A communication method based on capacitive coupling in which (capacity) is formed is included.
  • the communication distance is limited to several ⁇ m to several tens of ⁇ m, and transmission between a plurality of chips is difficult. Therefore, the former system is mainly used.
  • FIG. 9 is a block diagram showing a configuration of a conventional transmission / reception apparatus.
  • the transmission / reception device includes a transmission device 111 and a reception device 112.
  • the transmission device 111 includes a data transmission circuit 201 and a transmission coil 206.
  • the receiving device 112 includes a data receiving circuit 202 and a receiving coil 207.
  • the data transmission circuit 201 outputs a pulse-like current I that changes with time to the transmission coil 206 as shown in FIG. At this time, an induced magnetic field proportional to the time derivative dI / dt of the current I is generated, and the induced electromotive force shown in FIG.
  • the current flowing through the transmission coil 206 is increased to generate a positive voltage (induced electromotive force) at the reception coil 207.
  • the current flowing through the transmission coil 206 is reduced to generate a negative voltage at the reception coil 207.
  • the current flowing through the transmission coil 206 is increased to generate a positive voltage at the reception coil 207.
  • the data receiving circuit 202 amplifies the voltage of the receiving coil 207, detects the difference between these two pulse voltages, and converts it into digital data.
  • the receiving device 112 In non-contact communication, although digital data can be transmitted, there is a problem that it is difficult for the receiving device 112 to output a DC voltage of an arbitrary level (size).
  • the current in the transmission coil 206 of the transmission device 111 In order to generate an arbitrary DC voltage having a constant magnitude in the reception device 112, the current in the transmission coil 206 of the transmission device 111 must be monotonously increased (or decreased) at a constant rate. That is, it is necessary to generate a constant dI / dt.
  • it is necessary to flow a strong current through the transmission coil 206 in order to increase (or decrease) the current flowing through the transmission coil 206 at a constant rate over a long period of time, it is necessary to flow a strong current through the transmission coil 206, and there is a certain limit in the current driving capability.
  • the transmitting device 111 cannot generate such a strong current.
  • the following method can be considered for outputting an analog signal. That is, the value of the analog signal to be output is transmitted as digital data from the transmission device 111 to the reception device 112.
  • the reception device 112 receives the digital data, and then receives a digital-analog conversion circuit (not shown) provided therein.
  • This is a method of outputting an analog signal using Patent Document 1 describes a delta modulation method in which an output voltage is increased or decreased by a certain amount in accordance with “0” and “1” of an input digital signal for each clock cycle.
  • a method may be considered in which a voltage integration circuit (not shown) is provided in the reception device 112 and the voltage integration circuit integrates the output voltage value by a minute amount V each time a voltage pulse is input to the reception device 112. . At this time, a DC voltage of a desired level is obtained in the receiving device 112 by transmitting the pulse N times.
  • Patent Document 3 describes a method in which an induced electromotive force of a receiving coil is half-wave rectified or full-wave rectified and then passed through an integrating circuit. According to this method, a DC voltage proportional to the number of pulses N can be output.
  • Patent Documents 1 to 3 are incorporated herein by reference. The following analysis was made by the present inventors.
  • the general digital-analog conversion circuit that converts digital (binary) signals to analog signals and the delta modulation method described in Patent Document 1 have a large conversion circuit area and require a dedicated clock for the digital-analog conversion circuit.
  • the output voltage range is narrow (that is, a digital-analog conversion circuit corresponding to the entire range from the ground level to the power supply voltage level is difficult).
  • the area and power consumption of the amplifier circuit for converting a minute induced electromotive force input to the receiving device 112 into an input signal (that is, a digital signal) of the digital-analog conversion circuit is large.
  • the time of the induced electromotive force V in the receiving device 112 regardless of the shape of the pulse between two time points (time 0 and T in FIG. 11) where the current by the data transmission circuit 201 does not flow.
  • the integration is zero. That is, the following formula As described above, the time integral of the induced electromotive force in the receiving device 112 is always zero. At this time, the filter output voltage obtained by inputting the induced electromotive force to the low-pass filter also becomes zero. Therefore, in the method using the low-pass filter as described in Patent Document 2, there is a problem that a DC voltage of an arbitrary output level cannot be generated.
  • Another problem is to provide means for compensating for the value of the output DC voltage when there is variation in the intensity of the transmission current and the reception circuit.
  • the receiving apparatus is: A receiving coil whose electromotive force is induced by the transmitting coil; When a first current whose rise time is shorter than the fall time is induced to flow through the transmission coil, a second current in a direction opposite to the first current is generated when the rise time is longer than the fall time.
  • a filter circuit having different transmission characteristics for the electromotive force when induced by flowing through the transmission coil; and An integration circuit for integrating the current output by the filter circuit. That is, the receiving apparatus causes the first coil to have a rise time shorter than the fall time or a second current that is longer than the fall time and opposite to the first current.
  • a transmitting apparatus is: A transmission coil for inducing an electromotive force in the reception coil by electromagnetic induction; A first current having a rise time shorter than the fall time, and a data transmission circuit for outputting a second current in a direction opposite to the first current to the transmission coil, the rise time being longer than the fall time. I have.
  • a filter circuit is: A first diode and a second diode having a predetermined logic threshold, the cathode of the first diode being connected to the anode and the first node of the second diode; A bidirectional diode having an anode connected to the cathode of the second diode and an output node; A unity gain buffer in which the input voltage and the output voltage are equal, and one of the inputs is connected to the output node and the output is connected to the second node; And a resistor connected to the first node and the second node.
  • the transmission / reception method is: Outputting a first current having a rise time shorter than the fall time and a second current having a reverse sign to the first current and having a rise time longer than the fall time to the transmission coil; A step of inducing an electromotive force in the receiving coil based on the current output to the transmitting coil; Inputting the electromotive force into a filter circuit having different transmission characteristics with respect to the electromotive force when induced by the first current and when induced by the second current; Integrating the current output by the filter circuit.
  • the transmission / reception method is Flowing a first current having a rise time shorter than the fall time or a second current having an opposite sign to the first current and having a rise time longer than the fall time to the transmission coil; A step of inducing an electromotive force in the receiving coil based on the current output to the transmitting coil; Filtering the electromotive force induced in the receiving coil by a filter circuit; Integrating the current output by the filter circuit with an integrating circuit.
  • the filter circuit outputs a current when a difference between an input voltage to the filter circuit and an average value thereof is a predetermined threshold value or more.
  • the filter circuit outputs a current when a difference between an input voltage to itself and an output voltage of the integrating circuit is equal to or greater than a predetermined threshold.
  • the receiving device of the third development form outputs a current when the filter circuit includes a frequency component having a frequency at which the input voltage to itself exceeds a predetermined threshold.
  • the filter circuit outputs a current having an intensity corresponding to a difference between an input voltage to itself and an average value thereof.
  • the filter circuit outputs a current having an intensity corresponding to a difference between an input voltage to itself and an output voltage of the integrating circuit.
  • the filter circuit outputs a current over a predetermined period from a time point when a difference between an input voltage to the filter circuit and an average value thereof exceeds a predetermined threshold value.
  • the filter circuit outputs a current over a predetermined period from a time point when a difference between an input voltage to itself and an output voltage of the integrating circuit exceeds a predetermined threshold value.
  • the data transmission circuit outputs either the first current or the second current to the transmission coil in accordance with the value of the received digital data.
  • the transmission / reception device of the ninth development form includes the above-described reception device and the above-described transmission device.
  • the transmission / reception apparatus of the tenth development form is
  • the reception device includes a comparison circuit that compares the output voltage of the data reception circuit with a predetermined reference voltage and transmits a comparison result to the transmission device;
  • the transmission device receives the comparison result, and the intensity of the first current and / or the second current generated by the data transmission circuit according to the received comparison result, and / or It is preferable that a control circuit for controlling the number of pulses is provided.
  • the comparison circuit has an integrated voltage value obtained when the data transmission circuit outputs either the first current or the second current a predetermined number of times. It is preferable to compare the reference voltage.
  • the control circuit causes the integrated voltage value when either one of the first current and the second current is output N ⁇ 1 times by the data transmission circuit. Is less than the reference voltage and is output N times, the integrated voltage value exceeds the reference voltage, or the integrated voltage value when the current is output N-1 times by the data transmission circuit is When the integrated voltage value exceeds the reference voltage and is output N times below the reference voltage, the increment of the integrated voltage value per output of the current divides the absolute value of the reference voltage by N. It is preferable to estimate that it is equal to
  • the control circuit when the control circuit cannot obtain a predetermined resolution in the voltage output by the data reception circuit, the first current generated by the data transmission circuit, It is preferable to reduce the second current amount.
  • the filter circuit according to the fourteenth development further includes a capacitor connected to the input node and the first node.
  • the transmission / reception method of the fifteenth development form is Comparing the voltage output by the integration circuit with a predetermined reference voltage;
  • the method includes a step of controlling the intensity of the first current and / or the second current and / or the number of pulses according to the result of the comparison.
  • the present invention eliminates the need for an amplifier circuit for converting a minute induced electromotive force into a digital signal in the receiving apparatus. Therefore, the area and power consumption of the receiving device are reduced.
  • the configuration provided with the comparison circuit can compensate for the value of the output DC voltage even when there is a variation in the intensity of the transmission current and the reception circuit.
  • FIG. 1 is a block diagram showing the configuration of the receiving apparatus according to this embodiment.
  • the receiving device 12 includes a receiving coil 107, a filter circuit 104, and an integrating circuit 105.
  • An electromotive force is induced in the reception coil 107 by the transmission coil 106.
  • the filter circuit 104 has a case where the first current having a rise time shorter than the fall time is caused to flow through the transmission coil, and the case where the rise time is longer than the fall time and is opposite to the first current.
  • the transmission characteristics with respect to the electromotive force are different from those induced by flowing a second current through the transmission coil.
  • the integration circuit 105 integrates the current output from the filter circuit 104.
  • FIG. 2 is a block diagram showing the configuration of the transmission / reception apparatus according to the first embodiment of the present invention.
  • the transmission / reception device includes a transmission device 11 and a reception device 12.
  • the transmission device 11 includes a data transmission circuit 101 and a transmission coil 106.
  • the receiving device 12 includes a data receiving circuit 102 and a receiving coil 107.
  • the data transmission circuit 101 receives digital data to be transmitted, and outputs a current to the transmission coil 106 according to the value of the received digital data.
  • the data receiving circuit 102 outputs a DC voltage according to the received data.
  • the data reception circuit 102 includes an amplification circuit 103, a filter circuit 104, and an integration circuit 105.
  • FIG. 3 is a timing chart for explaining the operation of the transmission / reception apparatus according to the present embodiment.
  • the data transmission circuit 101 selects either the first current or the second current according to the input digital data.
  • the first current is positive in the first period in which the rise time is short and the time differential dI / dt of the current is large, and in the second period in which the fall time is long and the absolute value of dI / dt is small.
  • the second current is a current that flows in a negative direction in the second period having a long rise time, the first period having a short fall time, and the second period having a long rise time.
  • the first current or the second current selected by the data transmission circuit 101 is supplied to the transmission coil 106, and an induction magnetic field is generated by electromagnetic induction.
  • the induced electromotive force generated by the first current is a high positive voltage (having a large absolute value) corresponding to the dI / dt of the current in the first period, and the current in the second period. It consists of a low negative voltage (small absolute value) corresponding to dI / dt.
  • the induced electromotive force generated by the second current depends on a high negative voltage (a large absolute value) corresponding to the current dI / dt in the first period and the current dI / dt in the second period. It consists of a very low (small absolute value) positive voltage.
  • the amplification circuit 103 amplifies the induced electromotive force and outputs it.
  • the filter circuit 104 outputs a current only when the difference between the voltage output by the amplifier circuit 103 and the average voltage is a certain value or more. In the case of the first current, the filter circuit 104 blocks a negative voltage having a small difference from the average voltage and allows only a part of the positive voltage to pass. On the other hand, in the case of the second current, the filter circuit 104 blocks a positive voltage having a small difference from the average voltage and allows only a part of the negative voltage to pass.
  • the integration circuit 105 integrates the current output from the filter circuit 104.
  • the integration circuit 105 increases the output voltage by a minute amount Vp.
  • the integration circuit 105 decreases the output voltage by a minute amount Vm.
  • FIG. 4 is a block diagram illustrating configurations of the filter circuit 104 and the integration circuit 105 in the transmission / reception apparatus according to the present embodiment.
  • the filter circuit 104 includes a capacitor 301, a bidirectional diode 302, a unity gain buffer 303, and a resistor 304.
  • the bidirectional diode 302 is configured by short-circuiting the anode side and the cathode side of two diodes having a logic threshold value Vd in reverse.
  • Vd logic threshold value
  • FIG. 5 and 6 are timing charts showing operations of the filter circuit 104 and the integrating circuit 105.
  • FIG. The filter circuit 104 blocks an output voltage of the amplifier circuit 103 whose absolute value is equal to or less than a certain value.
  • a positive current flows from the input to the output in the filter circuit 104 (FIG. 5).
  • a negative current flows from the output to the input in the filter circuit (FIG. 6).
  • no current flows in the filter circuit 104.
  • the capacitor 301, the unity gain buffer 303, and the resistor 304 form a bias conversion circuit.
  • the output voltage of the filter circuit 104 is Vout
  • the output Vc of the capacitor 301 is Vout + ⁇ Vx when the voltage of the input signal is higher than the average voltage of the input signal by ⁇ Vx.
  • a current flows through the bidirectional diode 302 in the positive direction from the input to the output, and the output Vout is increased by the integration circuit 105. To do.
  • the filter circuit 104 is characterized in that the output current does not depend on the value of the output voltage and is determined only by Vd and ⁇ Vx.
  • the filter circuit 104 may not have the capacitor 301. In this case, the filter circuit 104 outputs a current when the difference between the input voltage to itself and the output voltage of the integrating circuit 105 is equal to or greater than the logic threshold of the diode.
  • Vp when the first current is input once and Vm when the second current is input once are constant values independent of Vout. Therefore, when the first current is input N times and the second current is input M times, Vout increases by N * Vp ⁇ M * Vm.
  • the output voltage can be increased / decreased only by simple amplification and filter processing without digitally converting a minute induced electromotive force input to the data receiving circuit 102 by the transmission / reception apparatus according to the present embodiment. Therefore, the area and power consumption of the data receiving circuit 102 can be reduced. In addition, since the data receiving circuit 102 does not require a synchronous clock signal for sampling data, the trouble of separately inputting a clock is also eliminated. Further, by using two types of transmission currents (first current and second current), not only the output signal level of the integrating circuit can be added but also subtracted. Therefore, Vout lower than the previous Vout can be generated by subtraction without using a reset signal as in the conventional transmitter / receiver.
  • FIG. 12 shows a data transmission circuit 101 of the transmission apparatus 11 according to the present embodiment as an example.
  • the following method can be used to generate the first current and the second current.
  • the PMOS in the input drivers 603 and 604 is turned on by increasing the PMOS driving power in the input drivers 603 and 604 of the H-bridge type current driving circuit 602 and reducing the NMOS driving power.
  • the rising or rising current transition time can be shortened in the first period, and the rising or rising current transition time can be increased in the second period in which the NMOS of the input drivers 603 and 604 is turned on.
  • a transmission / reception apparatus will be described with reference to the drawings.
  • the output voltage rise Vp when the first current is input once changes depending on the communication distance and the variation in the logical threshold value Vd of the bidirectional diode 302.
  • FIG. 7 is a block diagram illustrating the configuration of the transmission / reception apparatus according to the present embodiment.
  • the transmission / reception device includes a transmission device 21 and a reception device 22.
  • the transmission device 21 includes a data transmission circuit 101, a transmission coil 106, a reception coil 117, a comparison result reception circuit 503, and a control circuit 504.
  • the reception device 22 includes a data reception circuit 102, a reception coil 107, a comparison circuit 501, a comparison result transmission circuit 502 and a transmission coil 116.
  • the data transmission circuit 101 and the data reception circuit 102 are the same as those in the transmission / reception apparatus according to the first embodiment (FIG. 2).
  • the comparison circuit 501 compares the output voltage of the data reception circuit 102 with a predetermined reference voltage Vref.
  • the comparison result transmission circuit 502 feeds back the comparison result of the comparison circuit 501 to the transmission device 21.
  • the control circuit 504 controls the communication intensity and the number of transmission pulses of the data transmission circuit 101 according to the comparison result.
  • the reference voltage Vref an appropriate value within the range from the ground to the power supply voltage may be generated inside the receiving device 22 or may be input from the outside of the receiving device 22.
  • FIG. 8 is a timing chart showing the operation of the transmission / reception apparatus according to this embodiment.
  • the output voltage Vout is set to the lowest level (for example, 0). This can be realized by outputting the second current an appropriate number of times.
  • the first current is input once, the output result Vout of the data receiving circuit 102 is compared with the reference voltage Vref, and the comparison result is transmitted to the control circuit 504.
  • control circuit 504 can also estimate the value of Vm. First, the output result Vout of the data receiving circuit 102 is set to the highest level (for example, the power supply voltage Vdd). This can be realized by outputting the first current an appropriate number of times. Next, the second current is input once, the output result of the receiving circuit is compared with the reference voltage Vref, and the result is transmitted to the control circuit 504.
  • the highest level for example, the power supply voltage Vdd
  • the values of Vp and Vm when the transmission current is lowered can be calculated by performing the above correction again after lowering the transmission current.
  • a method of reducing the transmission current of the data transmission circuit 101 a method of reducing the power supply voltage of the data transmission circuit 101, a method of switching the drive current by adjusting the size of the transistor that drives the data transmission circuit 101, or the like can be considered. As described above, the voltage resolution of the output voltage of the data receiving circuit 102 can be improved.
  • the transmission / reception apparatus can correctly control the value of the output voltage of the data reception circuit 102 even when the intensity of the transmission current and the variation of the data reception circuit 102 occur. Furthermore, since the transmission / reception apparatus according to the present embodiment does not require a correction circuit in the data reception circuit 102, the circuit configuration is simple and an increase in the area of the data reception circuit 102 can be prevented. In addition, since the comparison circuit 501 and the comparison result transmission circuit 502 can also be asynchronous circuits that do not use a clock, the reception device 22 does not need a clock signal and a reset signal.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Near-Field Transmission Systems (AREA)
  • Dc Digital Transmission (AREA)

Abstract

La présente invention concerne un dispositif d'émission-réception qui produit en sortie une tension de courant continu par l'intermédiaire d'une communication sans contact, la superficie et la quantité d'énergie consommée par le dispositif de réception étant réduite. Ce dispositif de réception comporte une bobine de réception dans laquelle, pour induire une force électromotrice, on fait passer dans une bobine d'émission, d'une part un premier courant dont le temps de montée est plus court que le temps de descente, et d'autre part un second courant de sens opposé au premier et dont le temps de montée est plus long que le temps de descente. Le dispositif de réception comporte en outre un circuit filtre qui filtre la force électromotrice qui a été induite dans la bobine de réception, et un circuit d'intégration qui intègre le courant produit en sortie par le circuit filtre.
PCT/JP2009/066390 2008-09-19 2009-09-18 Dispositifs d'émission, de réception, d'émission-réception, et procédé d'émission-réception WO2010032832A1 (fr)

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JP2010529816A JP5360066B2 (ja) 2008-09-19 2009-09-18 送信装置、受信装置及び送受信装置並びに送受信方法

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JP2008241172 2008-09-19
JP2008-241172 2008-09-19

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007086285A1 (fr) * 2006-01-30 2007-08-02 Nec Corporation Système de transmission de signal et dispositif de circuit intégré à semiconducteur

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JP4622722B2 (ja) * 2005-07-25 2011-02-02 ソニー株式会社 受信機および無線通信システム
JP4784773B2 (ja) * 2005-09-02 2011-10-05 日本電気株式会社 伝送方法、インターフェース回路、半導体装置、半導体パッケージ、半導体モジュールおよびメモリモジュール

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007086285A1 (fr) * 2006-01-30 2007-08-02 Nec Corporation Système de transmission de signal et dispositif de circuit intégré à semiconducteur

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NORIYUKI MIURA ET AL.: "A 0.14 pJ/b Inductive- Coupling Transceiver With Digitally-Controlled Precise Pulse Shaping", IEEE JOURNAL OF SOLID- STATE CIRCUITS, vol. 43, no. 1, January 2008 (2008-01-01), pages 285 - 291 *

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