JP2009118218A - Radio communication apparatus, electronic device, and printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve simplification of a reference clock circuit and to reduce power consumption. <P>SOLUTION: A radio communication apparatus 1 includes: a digital circuit 20 which operates on the basis of a reference clock CK; one or more clock extracting sections 100, 300 each for receiving digital radiation noise RN radiated by the digital circuit 20 and extracting a synchronizing clock SC from the component of the reference clock CK contained in the digital radiation noise RN; a radio transmitting section 200 which operates on the basis of the synchronizing clock SC or the reference clock CK; and a radio receiving section 400 which operates on the basis of the synchronizing clock SC or the reference clock CK. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wireless communication device, an electronic device, and a printing device.

  Ultra-Wide Band (UWB) communication is a communication method that performs data communication using a very wide frequency band. Communication methods using UWB wideband signals include conventional spread spectrum methods and orthogonal frequency division multiplexing (OFDM). In addition, impulse radio using very short pulses. (IR: Impulse Radio) method. In particular, the IR method in UWB communication is called UWB-IR. In the UWB-IR system, modulation / demodulation can be performed only by time axis operation not based on conventional modulation, and simplification of the circuit and low power consumption can be expected.

  In conventional wireless communication, a transmitter and a receiver need to have separate reference clocks, and an oscillator and a digital circuit for generating the reference clock are required. In particular, in the UWB-IR system, clock synchronization between transmission and reception is a major key to reducing power consumption.

  For example, Patent Document 1 describes a synchronization method for a synchronous detection type radio.

JP 2003-319003 A

  However, in the conventional method, it is necessary to regenerate the carrier wave on the transmission side on the reception side, and there is a problem that the circuit scale and power consumption increase.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

[Application Example 1]
A digital circuit that operates based on a reference clock; and one or more clock extraction units that receive digital radiation noise radiated from the digital circuit and extract a synchronous clock from components of the reference clock included in the digital radiation noise; A wireless transmission unit that operates based on the synchronization clock or the reference clock; and a wireless reception unit that operates based on the synchronization clock or the reference clock, wherein at least one of the wireless transmission unit and the wireless reception unit is the A wireless communication device that operates based on a synchronous clock.

  According to this configuration, it is not necessary to mount a circuit for generating a reference clock in both the wireless transmission unit and the wireless reception unit, and the circuit scale can be reduced and the power consumption can be reduced.

[Application Example 2]
A digital circuit that operates based on a reference clock; and one or more clock extraction units that receive digital radiation noise radiated from the digital circuit and extract a synchronous clock from components of the reference clock included in the digital radiation noise; A wireless transmission unit that operates based on the synchronization clock or the reference clock and a wireless reception unit that operates based on the synchronization clock or the reference clock are included in the same casing, and the wireless transmission unit and the wireless reception unit At least one of the wireless communication devices operates based on the synchronous clock.

  According to this configuration, it is not necessary to mount a circuit for generating a reference clock in both the wireless transmission unit and the wireless reception unit, and the circuit scale can be reduced and the power consumption can be reduced.

[Application Example 3]
The wireless communication apparatus according to the above, wherein the wireless transmission unit and the wireless reception unit perform pulse wireless communication using pulses.

  According to this configuration, stable communication can be performed even when the level of digital radiation noise is high by using the pulse radio system.

[Application Example 4]
The wireless communication apparatus according to the above, wherein the clock extraction unit includes an antenna that receives the digital radiation noise.

  According to this configuration, the reception sensitivity of digital radiation noise is increased, and a necessary clock can be obtained while suppressing digital radiation noise to the outside of the device.

[Application Example 5]
In the wireless communication apparatus described above, the clock extraction unit extracts the synchronous clock from radiation noise superimposed on a power line.

  According to this configuration, since an antenna is not necessary, the circuit scale can be reduced.

[Application Example 6]
The wireless communication apparatus according to the above, wherein the clock extraction unit includes a band-pass filter that extracts an nth-order (n is an integer of 2 or more) harmonics of the reference clock.

  According to this configuration, the circuit scale of the multiplier circuit of the wireless communication device can be reduced.

[Application Example 7]
In the wireless communication device described above, the clock extraction unit includes a variable bandpass filter and a fast Fourier transform unit that obtains a frequency component of the digital radiation noise, and the variable is based on the frequency component of the digital radiation noise. A wireless communication apparatus, wherein a center frequency of a bandpass filter is set.

  According to this configuration, it is possible to save the trouble of adjusting the clock extraction unit in advance according to the digital circuit that emits digital radiation noise.

[Application Example 8]
In the wireless communication device described above, the clock extraction unit includes a variable bandpass filter and a control unit for controlling a center frequency of the variable bandpass filter, and the control unit includes the variable bandpass filter. A wireless communication apparatus, wherein a center frequency of a filter is sequentially changed, and the center frequency is determined when the synchronous clock is extracted.

  According to this configuration, it is possible to save the trouble of adjusting the clock extraction unit in advance according to the digital circuit that emits digital radiation noise.

[Application Example 9]
In the wireless communication apparatus described above, the wireless transmission unit does not perform transmission for a predetermined period including a time point when the clock extraction unit extracts the synchronous clock from the digital radiation noise. apparatus.

  According to this configuration, wireless communication can be performed without being affected by digital radiation noise.

[Application Example 10]
In the wireless communication device described above, the wireless transmission unit and the wireless reception unit are pulse wireless systems using pulses, and generate the pulses during a period in which the synchronous clock is continuously generated at a predetermined interval. A wireless communication apparatus that adjusts a timing signal and generates the pulse based on the timing signal other than the period.

  According to this configuration, wireless communication can be performed without being affected by digital radiation noise and by synchronizing the synchronization clock and the timing signal.

[Application Example 11]
In the wireless communication device described above, the wireless transmission unit receives input data using a digital data sequence generated from a pattern in which the synchronous clock is continuously generated at a predetermined interval and a pattern in other periods as an encryption key. A wireless communication apparatus that transmits encrypted data that has been encrypted, and wherein the wireless reception unit decrypts the encrypted data with the encryption key.

  According to this configuration, encryption can be performed with a simple circuit configuration, and the safety of wireless communication can be improved.

[Application Example 12]
An electronic apparatus comprising: the wireless communication device described above; and an image display panel, wherein the digital radiation noise radiated from the image display panel is received and the synchronization clock is extracted.

  According to this configuration, it is not necessary to mount a circuit for generating a reference clock in both the wireless transmission unit and the wireless reception unit, and the circuit scale can be reduced and the power consumption can be reduced.

[Application Example 13]
The wireless communication device according to the above, a print head unit including the wireless reception unit, and a print controller unit including the wireless transmission unit, and receiving the digital radiation noise radiated from a drive signal of the print head unit And extracting the synchronous clock.

  According to this configuration, it is not necessary to mount a circuit for generating a reference clock in both the wireless transmission unit and the wireless reception unit, and the circuit scale can be reduced and the power consumption can be reduced.

  Hereinafter, embodiments of a wireless communication device will be described with reference to the drawings.

(First embodiment)
<Configuration of wireless communication device>
First, the configuration of the wireless communication apparatus according to the first embodiment will be described with reference to FIG. FIG. 1 is a circuit diagram showing a configuration of a wireless communication apparatus according to the first embodiment. FIG. 1A is a circuit diagram illustrating a configuration of a wireless communication device when a clock extraction unit is provided in both a wireless transmission unit and a wireless reception unit, and FIG. 1B is a wireless transmission of the clock extraction unit. FIG. 2 is a circuit diagram illustrating a configuration of a wireless communication device provided only in a unit, and a wireless receiving unit is connected from a digital circuit by wire.

  As shown in FIG. 1A, a wireless communication device 1 includes an oscillator 10 that oscillates a reference clock CK, a digital circuit 20 that operates based on the reference clock CK, and a digital that the digital circuit 20 radiates in the same housing. Antennas 101 and 301 that receive the radiation noise RN, clock extraction units 100 and 300 that extract the synchronization clock SC from the component of the reference clock CK included in the received digital radiation noise RN, and wireless transmission that operates based on the synchronization clock SC Unit 200 and radio receiving unit 400, transmitting antenna 201 for transmitting radio signal WS from radio transmitting unit 200, and receiving antenna 401 for receiving radio signal WS and taking in radio receiving unit 400. Yes.

  The clock extraction units 100 and 300 and the antennas 101 and 301 are not necessarily present in both the wireless transmission unit 200 and the wireless reception unit 400. For example, as illustrated in FIG. The clock extraction unit 100 may be connected, and the radio reception unit 400 may be directly connected to the wiring RNL that radiates the digital radiation noise RN of the digital circuit 20. Conversely, the wiring RNL that radiates the digital radiation noise RN may be directly connected only to the wireless transmission unit 200.

  Next, the configuration of the clock extraction unit will be described with reference to FIG. FIG. 2 is a circuit diagram showing a configuration of the clock extraction unit.

  As shown in FIG. 2, the clock extraction unit 100 separates a signal that can be used as a useful synchronous clock SC from a digital radiation noise RN received by the antenna 101. A band-pass filter (BPF: Band-pass filter) is used. 102, and an amplifier (AMP: amplifier) 104 that amplifies an output signal of the BPF 102 and generates a synchronous clock SC. Similarly, the clock extraction unit 300 includes a BPF 302 and an AMP 304.

  Next, configurations of the wireless transmission unit and the wireless reception unit will be described with reference to FIG. FIG. 3 is a circuit diagram illustrating a configuration of the wireless transmission unit and the wireless reception unit.

  As illustrated in FIG. 3, the wireless transmission unit 200 includes a PLL (Phase-locked loop) 202 that multiplies the synchronous clock SC, a VCO (Voltage Controlled Oscillator) 203, and a baseband that converts the data signal DATA into a modulation signal MS. Unit (BB: baseband) 204, a multiplier 205 that multiplies the output signal of VCO 203 and modulation signal MS, and a band-pass filter (BPF: Band-) that filters the output signal of multiplier 205 to generate radio signal WS. pass filter) 206.

  On the other hand, the radio reception unit 400 includes a BPF 408 that filters the radio signal WS received by the reception antenna 401, an LNA (Low Noise Amplifier) 407 that amplifies the filtered signal, a PLL 402 that multiplies the synchronization clock SC, a VCO 403, and a VCO 403. The output signal of the LNA 407 and the output signal of the LNA 407, a low-pass filter (LPF) 405 for filtering the output signal of the multiplier 406 and outputting the demodulated signal DS, and the demodulated signal DS as data. And a baseband unit 404 for converting the signal DATA.

  According to the present embodiment described above, the following effects can be obtained.

  In the present embodiment, the synchronization clock SC can be extracted from the digital radiation noise RN radiated by the digital circuit 20, and the wireless transmission unit 200 and the wireless reception unit 400 can be operated. Therefore, the oscillator 10 that generates the reference clock CK is wirelessly connected. There is no need to install both the transmitter 200 and the wireless receiver 400, and the circuit scale can be reduced and the power consumption can be reduced.

  As mentioned above, although embodiment of the radio | wireless communication apparatus was described, it is not limited to such embodiment at all and can be implemented with various forms within the range which does not deviate from the meaning. Hereinafter, a modification will be described.

  (Modification 1) Modification 1 of the wireless communication apparatus will be described. In the first embodiment, the configuration shown in FIG. 3 has been described as the wireless transmission unit and the wireless reception unit. However, as shown in FIG. 4, the pulse generator 207 that generates the pulse signal PS in the wireless transmission unit 200 is provided. Alternatively, the wireless receiver 400 may be configured using a template pulse generator 409. By using a pulse radio system as shown in FIG. 4, stable communication can be performed even when the level of the digital radiation noise RN is large.

  (Modification 2) Modification 2 of the wireless communication apparatus will be described. The wiring between the oscillator 10 and the digital circuit 20 is formed in a loop shape as shown in FIG. 5A or a meander shape as shown in FIG. The circuit configuration of the clock extraction units 100 and 300 that receive the digital radiation noise RN can be simplified and power consumption can be reduced.

  (Modification 3) Modification 3 of the wireless communication apparatus will be described. In the first embodiment, the method of receiving the digital radiation noise RN radiated by the digital circuit 20 with the antennas 101 and 301 has been described. However, as shown in FIG. 6, the digital radiation noise RN superimposed on the power supply line VDD is changed. You may make it take in. FIG. 6 illustrates an example in which the wireless transmission unit 200 captures power from the power supply line VDD via the coils L1 and L2, and the wireless reception unit 400 captures power from the power supply line VDD via the coils L3 and L4. In this case, the clock extraction unit 100 filters the output of the coil L2 with a high pass filter (HPF: High Pass Filter) 112, amplifies it with the AMP 104, and extracts the synchronous clock SC. Similarly, the clock extraction unit 300 includes an HPF 312 and an AMP 304. With the configuration as shown in FIG. 6, the antennas 101 and 301 are not necessary, and the circuit scale can be reduced.

  (Modification 4) Modification 4 of the wireless communication apparatus will be described. In FIG. 2, the BPFs 102 and 302 are set so as to extract the nth-order (n is an integer of 2 or more) harmonics of the reference clock CK of the digital circuit 20 that radiates the digital radiation noise RN. With this configuration, the circuit scales of the PLLs 202 and 402 of the wireless transmission unit 200 and the wireless reception unit 400 can be reduced.

  (Modification 5) Modification 5 of the wireless communication apparatus will be described. In the first embodiment, the BPFs 102 and 302 of the clock extraction units 100 and 300 have a fixed center frequency value. However, when the center frequency cannot be determined in advance, as shown in FIG. The center frequency of the variable BPF 108 may be determined by examining the spectrum of the digital radiation noise RN using a Fast Fourier Transform (FFT) 106 or the like. The FFT 106 may be mounted on both the wireless transmission unit 200 and the wireless reception unit 400, but means for mounting the FFT 106 only on one side and sharing the center frequency may be separately provided.

  In the example of FIG. 7, the FFT 106 is mounted only on the wireless transmission unit 200, and the result is shared via the wireless signal WS. In this case, the information on the center frequency is received via the asynchronous detection unit 410 such as envelope detection. Asynchronous detection unit 410 is inferior in communication performance to synchronous detection unit 411, and therefore measures such as slowing the communication speed are necessary. However, since it is used only when information on the center frequency is shared, communication overhead does not occur. Further, during normal communication, the switching element SW2 may be used to stop. According to this configuration, it is not necessary to adjust the center frequencies of the BPFs 102 and 302 according to the circuit that generates the digital radiation noise RN.

  (Modification 6) Modification 6 of the wireless communication apparatus will be described. In the fifth modification, the case where the center frequency is obtained by the FFT 106 has been described. However, as shown in FIG. 8, the control unit 107 sequentially changes the center frequency of the variable BPF 108, and the level of the desired synchronous clock SC is extracted. You may make it search a point. According to this configuration, it is not necessary to adjust the center frequencies of the BPFs 102 and 302 according to the circuit that generates the digital radiation noise RN.

  (Modification 7) Modification 7 of the wireless communication apparatus will be described. As shown in FIG. 9, the synchronous clock SC may be extracted from the received digital radiation noise RN, and transmission / reception may be performed in accordance with the valley between the synchronous clock SC and the synchronous clock SC. According to this configuration, wireless communication can be performed without being affected by the digital radiation noise RN.

  (Modification 8) Modification 8 of the wireless communication apparatus will be described. As shown in FIGS. 10 and 11, when the digital radiation noise RN is radiated in a burst manner, the digital radiation noise RN may perform wireless communication with the pulse signal PS during the pause period. According to this configuration, wireless communication can be performed without being affected by the digital radiation noise RN and by synchronizing the synchronous clock SC.

  (Modification 9) Modification 9 of the wireless communication apparatus will be described. As shown in FIGS. 12 and 13, the burst pattern of the synchronous clock SC extracted from the digital radiation noise RN is stored as 0 and 1 in the encryption key storage units 214 and 414 to be used as an encryption key when performing wireless communication. Good. According to this configuration, encryption can be performed with a simple circuit configuration, and the safety of wireless communication can be improved.

  (Modification 10) Modification 10 of the wireless communication apparatus will be described. FIG. 14 is a block diagram of a foldable mobile phone 1000 which is an example of an electronic device using a wireless communication device. The first housing 1100 includes a liquid crystal controller IC 1120, a bus wiring 1140, a clock extraction / radio transmission unit 1150, a digital radiation noise reception antenna 1110, and a wireless transmission antenna 1160, and the second housing 1200 includes a liquid crystal panel. 1210, a liquid crystal driver IC 1220, a bus wiring 1240, a wired reference clock 1230, a clock extraction / radio reception unit 1250, and a radio reception antenna 1260, which are coupled by a hinge 1300. The digital radiation noise RN radiated from the liquid crystal panel 1210 is received and the synchronous clock SC is extracted.

  For example, the digital radiation noise RN may be received when the foldable mobile phone 1000 is folded to adjust the synchronous clock SC, and only the synchronous communication may be performed when the foldable mobile phone 1000 is opened.

  (Modification 11) Modification 11 of the wireless communication apparatus will be described. FIG. 15 is a block diagram of a printing apparatus 2000 using a wireless communication apparatus. The main body 2100 of the printing apparatus 2000 includes a print controller 2110, an antenna 101, a clock extraction unit 100, a wireless transmission unit 200, and a transmission antenna 201. The print head unit 2200 includes a print head 2210, an antenna 301, and the like. , A clock extraction unit 300, a wireless reception unit 400, and a reception antenna 401. The digital radiation noise RN radiated from the drive signal of the print head unit 2200 is received and the synchronous clock SC is extracted.

1 is a circuit diagram showing a configuration of a wireless communication apparatus according to a first embodiment. The circuit diagram which shows the structure of a clock extraction part. The circuit diagram which shows the structure of a wireless transmission part and a wireless reception part. The circuit diagram which shows the structure of the radio | wireless communication apparatus which concerns on the modification 1. FIG. The circuit diagram which shows the structure of the radio | wireless communication apparatus which concerns on the modification 2. FIG. 9 is a circuit diagram showing a configuration of a wireless communication apparatus according to Modification 3. FIG. 10 is a circuit diagram showing a configuration of a wireless communication apparatus according to Modification 5. FIG. 10 is a circuit diagram showing a configuration of a wireless communication apparatus according to Modification 6; FIG. 10 is a timing diagram illustrating a configuration of a wireless communication apparatus according to Modification 7. FIG. 10 is a timing diagram illustrating a configuration of a wireless communication device according to Modification 8. FIG. 10 is a circuit diagram showing a configuration of a wireless communication apparatus according to Modification 8. FIG. 10 is a timing diagram illustrating a configuration of a wireless communication apparatus according to Modification 9; FIG. 10 is a circuit diagram showing a configuration of a wireless communication apparatus according to Modification 9; FIG. 16 is a block diagram illustrating a configuration of an electronic apparatus according to Modification Example 10. FIG. 10 is a block diagram illustrating a configuration of a printing apparatus according to Modification Example 11.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Wireless communication apparatus, 10 ... Oscillator, 20 ... Digital circuit, 100, 300 ... Clock extraction part, 101, 301 ... Antenna, 102, 302 ... BPF, 104 ... AMP, 106 ... FFT, 107 ... Control part, 108 ... Variable BPF, 112, 312 ... HPF, 200 ... radio transmission unit, 201 ... transmission antenna, 202,402 ... PLL, 203 ... VCO, 205 ... multiplier, 207 ... pulse generator, 214,414 ... encryption key storage unit, DESCRIPTION OF SYMBOLS 300 ... Clock extraction part, 301 ... Antenna, 304 ... AMP, 400 ... Wireless reception part, 401 ... Reception antenna, 402 ... PLL, 403 ... VCO, 404 ... Baseband part, 406 ... Multiplier, 407 ... LNA, 408 ... BPF, 409 ... template pulse generator, 410 ... asynchronous detection unit, 411 ... synchronous detection unit, 1000 ... Folding cellular phone, 1100: first housing, 1110: digital radiation noise receiving antenna, 1120 ... liquid crystal controller IC, 1140 ... bus wiring, 1150 ... wireless transmission unit, 1160 ... wireless transmission antenna, 1200 ... second housing, DESCRIPTION OF SYMBOLS 1210 ... Liquid crystal panel, 1220 ... Liquid crystal driver IC, 1230 ... Wired reference clock, 1240 ... Bus wiring, 1250 ... Wireless receiving part, 1260 ... Wireless receiving antenna, 1300 ... Hinge, 2000 ... Printing device, 2100 ... Main part, 2110 ... Print controller, 2200... Print head section, 2210.

Claims (13)

A digital circuit that operates based on a reference clock;
One or more clock extraction units that receive digital radiation noise radiated by the digital circuit and extract a synchronous clock from a component of the reference clock included in the digital radiation noise;
A wireless transmitter that operates based on the synchronous clock or the reference clock;
A wireless receiver that operates based on the synchronous clock or the reference clock;
Including
At least one of the wireless transmission unit and the wireless reception unit operates based on the synchronous clock,
A wireless communication apparatus. A digital circuit that operates based on a reference clock;
One or more clock extraction units that receive digital radiation noise radiated by the digital circuit and extract a synchronous clock from a component of the reference clock included in the digital radiation noise;
A wireless transmitter that operates based on the synchronous clock or the reference clock;
A wireless receiver that operates based on the synchronous clock or the reference clock;
In the same housing,
At least one of the wireless transmission unit and the wireless reception unit operates based on the synchronous clock,
A wireless communication apparatus.   The radio communication apparatus according to claim 1, wherein the radio transmission unit and the radio reception unit perform pulse radio communication using a pulse.   3. The wireless communication apparatus according to claim 1, wherein the clock extraction unit includes an antenna that receives the digital radiation noise.   3. The wireless communication apparatus according to claim 1, wherein the clock extraction unit extracts the synchronous clock from radiation noise superimposed on a power supply line. 4.   3. The wireless communication device according to claim 1, wherein the clock extraction unit includes a band-pass filter that extracts an nth-order (n is an integer of 2 or more) harmonics of the reference clock. Communication device.   3. The radio communication apparatus according to claim 1, wherein the clock extraction unit includes a variable band pass filter and a fast Fourier transform unit that obtains a frequency component of the digital radiation noise, and the frequency component of the digital radiation noise The center frequency of the said variable band pass filter is set based on this, The radio | wireless communication apparatus characterized by the above-mentioned.   3. The wireless communication device according to claim 1, wherein the clock extraction unit includes a variable bandpass filter and a control unit for controlling a center frequency of the variable bandpass filter, and the control unit includes: A wireless communication apparatus, wherein the center frequency of the variable bandpass filter is sequentially changed, and the center frequency is determined when the synchronous clock is extracted.   3. The wireless communication device according to claim 1, wherein the wireless transmission unit does not transmit during a predetermined period including a time point when the clock extraction unit extracts the synchronous clock from the digital radiation noise. A wireless communication device.   3. The wireless communication device according to claim 1, wherein the wireless transmission unit and the wireless reception unit are a pulse wireless system using a pulse, and the synchronization clock is continuously generated at a predetermined interval. A wireless communication apparatus that adjusts a timing signal for generating a pulse and generates the pulse based on the timing signal in addition to the period.   3. The wireless communication device according to claim 1, wherein the wireless transmission unit encrypts a digital data sequence generated from a pattern in which the synchronous clock is continuously generated at a predetermined interval and a pattern in other periods. The wireless communication apparatus transmits the encrypted data obtained by encrypting the input data as described above, and the wireless reception unit decrypts the encrypted data with the encryption key.   12. The wireless communication apparatus according to claim 1, and an image display panel, receiving the digital radiation noise radiated from the image display panel and extracting the synchronization clock. Features electronic equipment.   A drive signal for the print head unit, comprising: the wireless communication device according to claim 1; a print head unit including the wireless reception unit; and a print controller unit including the wireless transmission unit. Receiving the digital radiation noise radiated from the printer and extracting the synchronous clock.

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