JP2002208868A - Radio communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide radio communication equipment which has radio communication function for preventing the lack of communication data and the deterioration of an error rate, and which can be miniaturized and thinned. SOLUTION: For the radio communication equipment, in one face of a printed board 30 of an almost square shape, data input/output terminals 28a and 28b are arranged on the edge part of a first side 31 of the printed board 30; a data communication circuit 15 is arranged close to the first side 31 and an adjacent second side 32; a storage circuit 27 is disposed close to the first side 31 and the other adjacent third side 33; an antenna terminal 11 is disposed in the edge part of a forth side 34 facing the first side 31; a high-frequency input/output circuit 12 is arranged at a position sandwiched by the antenna terminal 11 and the data communication circuit 15; and a clock signal oscillator 26 is installed at a corner, sandwiched by the third side 33 and the forth side 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency hopping (Spread Spectrum) technique.
g) A wireless communication device having a wireless communication function using the method.

[0002]

2. Description of the Related Art Generally, in communication using spread spectrum technology, a modulated signal obtained by modulating an input baseband signal such as voice on a transmitting side is spread spectrum using a spreading code, and then a high frequency signal is transmitted. Is transmitted to the communication partner. On the receiving side, the spread spectrum signal received from the communication partner is demodulated (despread) using the same spreading code as that on the transmitting side.

[0003] Communication systems using spread spectrum technology include Direct Spread (Direct Spread).
d) There is a method and a frequency hopping method. In the direct spreading method, spreading is performed while multiplying a narrow band modulated wave by a spreading code, and a certain continuous frequency band is used uniformly. On the other hand, the frequency hopping method spreads a signal within a frequency band by randomly switching the frequency of a carrier wave at the time of performing communication with a communication partner using a spreading code. For example, Bluetooth (Bluetooth)
Etc.

FIG. 4 is a block circuit diagram showing a schematic configuration of a conventional wireless communication device. The conventional wireless communication device 10 of FIG. 4 has the following circuit configuration. Antenna terminal 11
Is the switch circuit 1 via the band-pass filter circuit 13.
4 is connected.

[0005] A receiving amplifier 14, a mixer circuit 18, and a demodulation circuit 19 are connected to the reception side contact 14 a of the switch circuit 14.
Is connected to the switch circuit 1
The transmission circuit 20 composed of the transmission amplification circuit 21 and the modulation circuit 22 is connected to the transmission-side contact 14b of No. 4. A local oscillator 23 is connected to the mixer circuit 18 and the modulation circuit 22.

The receiving circuit 16 is connected to a data output terminal 28a via a baseband signal processing circuit 24, and the transmitting circuit 20 is connected to a data input terminal 28b via the baseband signal processing circuit 24. . Also,
A control circuit 25 is connected to the baseband signal processing circuit 24, a storage circuit 27 is connected to the control circuit 25,
Further, a clock signal oscillator 26 is provided.

Next, the operation of the conventional radio communication device 10 shown in FIG. 4 will be described. At the time of reception, the switch circuit 1
Reference numeral 4 is switched to the receiving side contact 14a, and the band pass filter circuit 13 and the receiving amplifier circuit 17 are connected. A spread spectrum signal (for example, 2.4 GHz band) from a communication partner side received by an antenna (not shown) connected to the antenna terminal 11 is received by a bandpass filter circuit 13 and a reception amplification circuit 17 into a reception high-frequency signal of a desired frequency band. Only the signal is amplified and applied to the mixer circuit 18. The received high-frequency signal is demodulated into a baseband signal by the mixer circuit 18 and the demodulation circuit 19, and necessary signal processing is performed by the baseband signal processing circuit 24, and is output from the data output terminal 28a.

At the time of transmission, the switch circuit 14 is switched to the transmission side contact 14b, and the band pass filter circuit 13 and the transmission amplification circuit 21 are connected. The data signal input from the data input terminal 28b is subjected to necessary signal processing by a baseband signal processing circuit 24 and spread by a modulation circuit 22 to a spread spectrum signal (for example, a 2.4 GHz band). Band-pass filter circuit 1
By 3, frequency components outside the transmission frequency band are removed, and transmitted from an antenna (not shown) connected to the antenna terminal 11 to the communication partner side.

A program for operating the control circuit 25 is stored in the storage circuit 27.
Controls the operation of the baseband signal processing circuit 24 based on the program stored in the storage circuit 27.

The local oscillator 23 generates a frequency signal (for example, 2.4 GHz) required for each of the mixer circuit 18 and the modulation circuit 22 to operate. Further, the clock signal oscillator 26 is a reference frequency signal (for example, 16 MHz) necessary for performing operations related to the reception circuit 16, the transmission circuit 20, the baseband signal processing circuit 24, and the control circuit 25.
Occurs.

[0011]

However, in the above prior art, when each circuit described in the conventional wireless communication apparatus 10 of FIG. 4 is arranged on a single small printed circuit board, the following will be described. However, there has been a problem that communication data is lost or an error rate is deteriorated due to mutual interference of signals between the circuits and mixing of different signals.

That is, digital signal noise input / output from the data input terminal 28b and the data output terminal 28a enters the antenna terminal 11 and the bandpass filter circuit 13.

Digital signal noise generated from the baseband signal processing circuit 24, the control circuit 25, and the storage circuit 27 enters the antenna terminal 11 and the bandpass filter circuit 13.

Digital signal noise generated from a signal pattern on a printed circuit board connecting each of the receiving circuit 16, the transmitting circuit 20, the baseband signal processing circuit 24, the control circuit 25, and the storage circuit 27 is generated by the antenna terminal 1
1, mixed into the band-pass filter circuit 13.

The noise related to the clock signal from the clock signal oscillator 26 is generated by the antenna terminal 11, the band-pass filter circuit 13, the reception circuit 16, and the transmission circuit 20.
Mixed in.

Further, noise generated from a device (not shown) connected to the data input terminal 28b and the data output terminal 28a is mixed into each circuit of the wireless communication device 10.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to divide each circuit into circuit blocks for each function and further devise a method of arranging each circuit block. Therefore, a wireless communication device which has a reduced size and a reduced thickness has a wireless communication function of preventing loss of communication data and deterioration of an error rate by reducing mutual interference of signals between respective circuits and mixing of different signals. The purpose is to provide.

[0018]

In order to solve the above problems, the present invention provides an antenna terminal, a high frequency input / output circuit for inputting / outputting a high frequency signal from the antenna terminal, and demodulating the input high frequency signal. Circuit for converting the received baseband signal into a baseband signal, a transmission circuit for modulating a transmission baseband signal and converting it to a high-frequency signal, and outputting the baseband signal; a baseband signal processing circuit for performing signal processing on the transmitted and received baseband signal; A data communication circuit including a control circuit for controlling a signal processing circuit; a clock signal oscillator for supplying a clock signal to the data communication circuit; a storage circuit storing a program for operating the control circuit; A wireless communication device in which data input / output terminals of a circuit are disposed on one surface of a substantially rectangular printed circuit board. The data input / output terminal is provided at an edge of a first side of a printed circuit board, and the data communication circuit is provided near both sides of the first side and a second side adjacent thereto. The storage circuit is provided close to both sides of a first side and another third side adjacent thereto, and the antenna terminal is provided at an edge of a fourth side opposed to the first side. The high-frequency input / output circuit is disposed at a position between the antenna terminal and the data communication circuit, and the clock signal oscillator is disposed at one corner between the third side and the fourth side. It is characterized by having been done.

Also, the present invention provides a method of manufacturing a high-frequency input / output circuit, a data communication circuit, a clock signal oscillator, and a memory circuit, which is provided on one surface of the printed circuit board, and substantially all of the other surface of the printed circuit board sandwiching the printed circuit board. A first ground pattern is provided so as to cover the plurality of main ground terminals connected to the first ground pattern, and the plurality of main ground terminals are respectively disposed near four corners of the printed circuit board. It is characterized by being arranged.

Further, according to the present invention, a sub earth terminal connected to the main earth terminal is disposed near one main earth terminal of the plurality of main earth terminals, and the antenna terminal is connected to the one main earth terminal. It is characterized by being arranged so as to be sandwiched between the main earth terminal and the auxiliary earth terminal.

Further, according to the present invention, the printed board is a laminated board including a surface layer, a plurality of intermediate layers, and a back layer, wherein the high-frequency input / output circuit, the data communication circuit, and the clock are provided on the surface layer. A signal oscillator and a storage circuit are provided,
The first ground pattern is provided on the back surface layer, the signal pattern relating to the data communication circuit, the clock signal oscillator and the storage circuit is provided on at least one of the intermediate layers, and the other one of the other intermediate layers is provided. A second ground pattern is disposed on the layer so as to cover substantially all of the signal pattern, and the signal pattern is disposed between the first ground pattern and the second ground pattern, and the first ground pattern is disposed between the first ground pattern and the second ground pattern. The ground pattern and the second ground pattern are connected by a plurality of through-hole holes.

The present invention also includes a shield case that covers the high-frequency input / output circuit, a data communication circuit, a clock signal oscillator, and a storage circuit provided on one surface of the printed circuit board. Are soldered to each of the main ground terminals.

In the wireless communication apparatus of the present invention, a frequency band of a high-frequency signal input / output from the antenna terminal is in a 2.4 GHz band, and uses a frequency hopping method using a spread spectrum technique. It is characterized by the following.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing the arrangement of each circuit on a printed circuit board of a wireless communication apparatus according to one embodiment of the present invention, and FIG. 2 is related to one embodiment of the present invention. FIG. 3 is a perspective view illustrating an appearance of the wireless communication device, and FIG. 3 is a block circuit diagram illustrating a schematic configuration of the wireless communication device according to the embodiment of the present invention.

The circuit configuration and operation of the wireless communication device 1 of the present embodiment shown in FIG. 3 will be described. The wireless communication device 1 according to the present embodiment includes an antenna terminal 11 and a high-frequency input / output circuit 12 for inputting and outputting a high-frequency signal from the antenna terminal 11.
A receiving circuit 16 for demodulating the input high-frequency signal and converting it to a reception baseband signal; a transmission circuit 2 for modulating a transmission baseband signal to convert it to a high-frequency signal and outputting it
0, a data communication circuit 1 including a baseband signal processing circuit 24 for performing signal processing of the transmission / reception baseband signal and a control circuit 25 for controlling the baseband signal processing circuit 24
5, a clock signal oscillator 26 for supplying a clock signal to the data communication circuit 15, a storage circuit 27 storing a program for operating the control circuit 25, a data input terminal 28b and a data output terminal of the data communication circuit 15. 2
8a.

The high-frequency input / output circuit 12 includes a band-pass filter circuit 13 and a switch circuit 14, and the reception circuit 16 includes a reception amplification circuit 17, a mixer circuit 1,
8 and a demodulation circuit 19, and the transmission circuit 20 includes a transmission amplification circuit 21 and a modulation circuit 22.

The antenna terminal 11 is connected to a switch circuit 14 via a band pass filter circuit 13.
The receiving side contact 14a of the switch circuit 14 includes a receiving circuit 1
6 is connected to a reception amplifier circuit 17, a mixer circuit 18, and a demodulation circuit 19, and the transmission side contact 14b of the switch circuit 14 is connected to the transmission amplification circuit 2 constituting the transmission circuit 20.
1 and the modulation circuit 22 are connected. A local oscillator 23 is connected to the mixer circuit 18 and the modulation circuit 22.

The receiving circuit 16 is connected to a data output terminal 28a via a baseband signal processing circuit 24, and the transmitting circuit 20 is connected to a data input terminal 28b via the baseband signal processing circuit 24. . Also,
A control circuit 25 is connected to the baseband signal processing circuit 24, a storage circuit 27 is connected to the control circuit 25,
Further, a clock signal oscillator 26 is connected to the data communication circuit 15.

Next, the wireless communication apparatus 1 of the present embodiment shown in FIG.
Will be described. At the time of reception, the switch circuit 14 is switched to the reception side contact 14a, and the bandpass filter circuit 13 and the reception amplification circuit 17 are connected. A spread spectrum signal (for example, 2.4 GHz band) from a communication partner side received by an antenna (not shown) connected to the antenna terminal 11 is received by a bandpass filter circuit 13 and a reception amplification circuit 17 into a reception high-frequency signal of a desired frequency band. Only the signal is amplified and applied to the mixer circuit 18. The received high-frequency signal is demodulated into a baseband signal by the mixer circuit 18 and the demodulation circuit 19, and necessary signal processing is performed by the baseband signal processing circuit 24, and is output from the data output terminal 28a.

At the time of transmission, the switch circuit 14 is switched to the transmission-side contact 14b, and the band-pass filter circuit 13 and the transmission amplification circuit 21 are connected. The data signal input from the data input terminal 28b is subjected to necessary signal processing by a baseband signal processing circuit 24 and spread by a modulation circuit 22 to a spread spectrum signal (for example, a 2.4 GHz band). Band-pass filter circuit 1
By 3, frequency components outside the transmission frequency band are removed, and transmitted from an antenna (not shown) connected to the antenna terminal 11 to the communication partner side.

In the storage circuit 27, a program for operating the control circuit 25 is stored.
Controls the operation of the baseband signal processing circuit 24 based on the program stored in the storage circuit 27.

The local oscillator 23 generates a frequency signal (for example, 2.4 GHz) necessary for the mixer circuit 18 and the modulation circuit 22 to operate. Further, the clock signal oscillator 26 generates a reference frequency signal (for example, 16 MHz) necessary for performing an operation related to the data communication circuit 15.

FIG. 1 is a schematic diagram showing the arrangement of each circuit on a printed circuit board of the wireless communication apparatus according to the present embodiment.
Is a plan view seen from one surface of the printed circuit board,
(B) is a cross-sectional view of the printed circuit board, and (c) is a plan view of the printed circuit board as viewed from the other surface. Next, the arrangement of each circuit on the printed circuit board 30 of the wireless communication device 1 according to the present embodiment will be described with reference to FIG.

FIG. 1A shows a circuit configuration similar to that of the wireless communication device 1 described with reference to FIG.
This is a view showing the state of being arranged on one side of the above. A data input terminal 28 is provided at the edge of the first side 31 of the printed circuit board 30.
b and the data output terminal 28a are provided, and the first side 31
The data communication circuit 15 is disposed adjacent to both sides of the second side 32 adjacent thereto and the storage circuit 27 is disposed adjacent to both sides of the first side 31 and another adjacent third side 33. The antenna terminal 11 is disposed at an edge of the fourth side 34 facing the first side 31, and the high-frequency input / output circuit 12 is disposed at a position between the antenna terminal 11 and the data communication circuit 15. The clock signal oscillator 26 is provided at one corner between the third side 33 and the fourth side 34.

That is, the first side 3 of the printed circuit board 30
The data input terminal 28b and the data output terminal 2
8a, the first side 31 and the adjacent second side 3
2 and a data communication circuit 15 is disposed in the vicinity of both sides.
The storage circuit 27 is disposed in the vicinity of both sides of the third side 33 and the adjacent third side 33, and the circuits for handling the digital signals are collectively arranged to arrange the data input terminal 28b and the data output terminal 28a. First side 3 of printed circuit board 30
By arranging them close to one side, digital signal noise generated from a signal pattern on the printed circuit board 30 connecting the circuits can be reduced.

Further, the fourth side opposing the first side 31 on which the data input terminal 28b and the data output terminal 28a are arranged.
The antenna terminal 11 is disposed at the edge of the side 34, and the high-frequency input / output circuit 12 is disposed at a position between the antenna terminal 11 and the data communication circuit 15, and the data input terminal 28b and the data output terminal 28a are provided. By separating the antenna terminal 11 as far as possible on the printed circuit board 30, the data input terminal 2
8b and the digital signal noise input / output from the data output terminal 28a are the antenna terminals 11 and 1
Mixing into the bandpass filter circuit 13 of the high-frequency input / output circuit 12 connected to 1 can be reduced.

Further, a clock signal oscillator 26 is disposed at one corner between the third side 33 and the fourth side 34, and the clock signal oscillator 26, the antenna terminal 11, the band-pass filter circuit 13, the receiving circuit By increasing the distance between the antenna terminal 11, the band-pass filter circuit 13, the reception circuit 16 and the transmission circuit 2, noise related to the clock signal from the clock signal oscillator 26 is increased.
0 can be reduced.

Therefore, the loss of communication data and the deterioration of the error rate caused by the digital signal noise and the noise relating to the clock signal entering the antenna terminal 11, the band-pass filter circuit 13, the receiving circuit 16 and the transmitting circuit 20 are prevented. Can be prevented.

FIG. 1C is a plan view of the printed circuit board 30 as viewed from the other surface.
FIG. 3 shows a state in which a first ground pattern 40 is provided. The first high-frequency input / output circuit 12, the data communication circuit 15, the clock signal oscillator 26, and the storage circuit 27 are disposed on one surface of the printed circuit board 30 so as to cover substantially the entire other surface of the printed circuit board 30 with the printed circuit board 30 interposed therebetween. And a plurality of main ground terminals 41, 42, 43, 4 connected to the first ground pattern 40.
4 are arranged near the four corners of the printed circuit board 30.

That is, the high-frequency input / output circuit 12 and the data communication circuit 1 provided on one surface of the printed circuit board 30
5. The first so as to cover substantially all of the other surface of the clock signal oscillator 26 and the storage circuit 27 across the printed circuit board 30.
Is provided, the other surface of the printed circuit board 30 is electromagnetically shielded by the first ground pattern 40, and digital signal noise and data input and output from the data input terminal 28b and the data output terminal 28a are output. Noise generated from a device (not shown) connected to the input terminal 28b and the data output terminal 28a is transmitted to the antenna terminal 11, the bandpass filter circuit 13, the reception circuit 16, and the transmission circuit 20 via the other surface of the printed circuit board 30. Mixing can be reduced.

Further, a plurality of main ground terminals 41, 42, 43, 44 arranged near the four corners of the printed circuit board 30.
Are connected to the first ground pattern 40,
The potential difference between the plurality of main earth terminals 41, 42, 43, 44 can be eliminated. That is, when the wireless communication device 1 is mounted on a main board of a device (not shown) connected to the data input terminal 28b and the data output terminal 28a, a plurality of main ground terminals 41, 42, 43, and 44 are provided, respectively.
By connecting the ground pattern of the main board of the device to the vicinity of four corners of the printed circuit board 30, the wireless communication device 1
The potential difference of the ground pattern of the main board of the device connected to the wireless communication device 1 can be more effectively eliminated near the wireless communication device 1. Therefore, it is possible to reduce digital signal noise superimposed on the ground pattern generated between ground patterns having a potential difference.

Further, a plurality of main ground terminals 41, 42, 4
A sub-ground terminal 45 connected to the main ground terminal 41 is provided near one of the main ground terminals 41 of the antennas 3 and 44. The antenna terminal 11 is located between the main ground terminal 41 and the sub-ground terminal 45. It is arranged to be sandwiched.

That is, by disposing the antenna terminal 11 between the main earth terminal 41 and the sub earth terminal 45, the digital signal noise and the data input terminal 28b
In addition, noise generated from a device (not shown) connected to the data output terminal 28a can be reduced from being mixed in from the antenna terminal 11.

Therefore, the digital signal noise,
Noise generated from a device (not shown) connected to the data input terminal 28b and the data output terminal 28a is generated by the antenna terminal 11, the band-pass filter circuit 13, and the reception circuit 16.
In addition, it is possible to prevent loss of communication data and deterioration of an error rate caused by mixing in the transmission circuit 20.

FIG. 1B is a cross-sectional view of the printed circuit board 30, showing the state of the patterns provided between the layers when the printed circuit board 30 is a laminated board. The printed board 30 is a laminated board including a front layer 30a, a plurality of intermediate layers 30b, and a back layer 30c. The high-frequency input / output circuit 12, the data communication circuit 15, the clock signal oscillator 26, and the memory A circuit 27 is provided, a first ground pattern 40 is provided on the back surface layer 30c, and a signal pattern 29 relating to the data communication circuit 15, the clock signal oscillator 26 and the storage circuit 27 is provided on at least one of the intermediate layers 30b. A second ground pattern 46 is provided on another layer of the intermediate layer 30b so as to cover substantially all of the signal pattern 29. The signal pattern 29 is composed of the first ground pattern 40 and the second ground pattern 46. The first ground pattern 40
And the second ground pattern 46 are connected by a plurality of through-holes 47.

That is, the printed circuit board 30 is
0a, a plurality of intermediate layers 30b, and a back layer 30c, and a signal pattern 29 relating to the data communication circuit 15, the clock signal oscillator 26, and the storage circuit 27 is provided on at least one of the intermediate layers 30b. By arranging the signal pattern 29 so as to be sandwiched between the first ground pattern 40 and the second ground pattern 46, the signal pattern 29
9 can be reduced.

Further, by connecting the first ground pattern 40 and the second ground pattern 46 with a plurality of through-holes 47, the potential difference between the first ground pattern 40 and the second ground pattern 46 can be reduced. Can be eliminated. Therefore, it is possible to reduce digital signal noise superimposed on the ground pattern generated between ground patterns having a potential difference.

Therefore, the digital signal noise is
It is possible to more effectively prevent the loss of communication data and the deterioration of the error rate caused by mixing in the antenna terminal 11, the band-pass filter circuit 13, the reception circuit 16, and the transmission circuit 20.

FIG. 2 is a perspective view showing the appearance of the wireless communication device 1 according to the present embodiment. FIG. 2 shows how the shield case 50 is mounted on the printed circuit board 30 and soldered. I do. FIG. 2A shows the shield case 50.
Is mounted on the printed circuit board 30.
The outer shape of the shield case 50 is, for example, the printed circuit board 3.
0, the high-frequency input / output circuit 12 and the data communication circuit 1 disposed on one surface of the printed circuit board 30.
5. Mounted on one surface of the printed circuit board 30 so as to cover the clock signal oscillator 26 and the storage circuit 27.

FIG. 2B shows a state in which the shield case 50 is mounted on the printed circuit board 30 and soldered. Are soldered to each of the plurality of main ground terminals 41, 42, 43, 44 disposed in the vicinity of the shield case 50. The respective soldered portions are indicated by 51, 52, 53 and 54.

Accordingly, the high-frequency input / output circuit 12 and the data communication circuit 1 provided on one surface of the printed circuit board 30
5. By covering the clock signal oscillator 26 and the storage circuit 27 with a shield case 50 and electromagnetically shielding, noise generated from a device (not shown) connected to the data input terminal 28b and the data output terminal 28a can be reduced to the antenna terminal 1
1. It is possible to prevent loss of communication data and deterioration of an error rate caused by being mixed into the bandpass filter circuit 13, the reception circuit 16, and the transmission circuit 20.

[0053]

As described above, the present invention provides an antenna terminal, a high-frequency input / output circuit for inputting / outputting a high-frequency signal from this antenna terminal, and a reception baseband signal by demodulating the input high-frequency signal. , A transmission circuit that modulates a transmission baseband signal to convert it into a high-frequency signal and outputs the signal, a baseband signal processing circuit that performs signal processing of the transmission and reception baseband signal, and controls the baseband signal processing circuit. A data communication circuit including a control circuit, a clock signal oscillator for supplying a clock signal to the data communication circuit, a storage circuit storing a program for operating the control circuit, and a data input / output terminal of the data communication circuit Is disposed on one surface of a substantially rectangular printed circuit board, wherein the first side of the printed circuit board is The data input / output terminal is disposed at an edge, and the data communication circuit is disposed adjacent to both sides of the first side and the second side adjacent thereto, and is adjacent to the first side. The storage circuit is provided near both sides of the other third side, and the antenna terminal is provided at an edge of a fourth side opposite to the first side. The high-frequency input / output circuit is disposed at a position sandwiched by a communication circuit, and the clock signal oscillator is disposed at a corner sandwiched between the third side and the fourth side. It is.

Therefore, according to the present invention, the data input terminal and the data output terminal are arranged on the edge of the first side of the printed circuit board, and the first side and the second side adjacent thereto are arranged. The data communication circuit is disposed close to both sides of the first side, and the storage circuit is disposed close to both sides of the first side and another third side adjacent to the first side to handle the digital signal. By arranging the circuits together and arranging them close to the first side of the printed circuit board on which the data input terminals and the data output terminals are arranged, a signal generated from a signal pattern on the printed circuit board connecting the circuits is formed. Digital signal noise can be reduced.

Further, the antenna terminal is disposed at an edge of a fourth side opposite to the first side where the data input terminal and the data output terminal are disposed, and the antenna terminal is connected to the data communication circuit. The high frequency input / output circuit is arranged at a position between the data input terminal and the data output terminal by maximally separating the data input terminal and the data output terminal from the antenna terminal on the printed circuit board. The output digital signal noise can be reduced from being mixed into the antenna terminal and the band-pass filter circuit of the high-frequency input / output circuit connected to the antenna terminal.

Further, the clock signal oscillator is provided at one corner between the third side and the fourth side, and the clock signal oscillator, the antenna terminal, the band-pass filter circuit, the receiving circuit, and the transmitting circuit are provided. By increasing the distance from the circuit, noise associated with the clock signal from the clock signal oscillator can be reduced from entering the antenna terminal, the band-pass filter circuit, the receiving circuit, and the transmitting circuit.

Therefore, it is possible to prevent loss of communication data and deterioration of an error rate caused by mixing of the digital signal noise and the noise related to the clock signal into the antenna terminal, the band-pass filter circuit, the reception circuit, and the transmission circuit. Can be.

Also, the present invention provides a method of manufacturing a high-frequency input / output circuit, a data communication circuit, a clock signal oscillator, and a memory circuit, which is disposed on one surface of the printed circuit board, and substantially all of the other surface of the printed circuit board sandwiching the printed circuit board. A first ground pattern is provided so as to cover the plurality of main ground terminals connected to the first ground pattern, and the plurality of main ground terminals are respectively disposed near four corners of the printed circuit board. It is characterized by being arranged.

Therefore, according to the present invention, the high-frequency input / output circuit provided on one surface of the printed circuit board,
By arranging the first ground pattern so as to cover substantially all of the other surface of the data communication circuit, the clock signal oscillator, and the storage circuit with the printed substrate interposed therebetween, the other surface of the printed substrate is Digital signal noise that is electromagnetically shielded by the ground pattern 1 and is input / output from the data input terminal and the data output terminal, and noise generated from a device (not shown) connected to the data input terminal and the data output terminal are printed. Mixing into the antenna terminal, the bandpass filter circuit, the reception circuit, and the transmission circuit via the other surface of the substrate can be reduced.

Further, since a plurality of main ground terminals arranged near the four corners of the printed circuit board are connected to the first ground pattern, a potential difference between each of the plurality of main ground terminals is eliminated. be able to. That is,
When the wireless communication device of the present invention is mounted on a main board of a device (not shown) connected to the data input terminal and the data output terminal, each of the plurality of main ground terminals,
By connecting the ground pattern of the main board of the device to the vicinity of the four corners of the printed board, the potential difference of the ground pattern of the main board of the device connected to the wireless communication device of the present invention can be changed in the vicinity of the wireless communication device. Thus, digital signal noise superimposed on the ground pattern generated between ground patterns having a potential difference can be reduced.

Accordingly, it is possible to prevent loss of communication data and deterioration of an error rate caused by the digital signal noise entering the antenna terminal, the bandpass filter circuit, the receiving circuit, and the transmitting circuit.

Further, the high-frequency input / output circuit, data communication circuit, clock signal oscillator and storage circuit constituting the wireless communication device are all arranged on one surface of the printed circuit board.

Therefore, the high-frequency input / output circuit, the data communication circuit, the clock signal oscillator, and the storage circuit, which constitute the wireless communication device, are all disposed on one surface of the printed circuit board. The thickness can be reduced.

Further, according to the present invention, a sub earth terminal connected to the main earth terminal is disposed near one main earth terminal of the plurality of main earth terminals, and the antenna terminal is connected to the one main earth terminal. It is characterized by being arranged so as to be sandwiched between the main earth terminal and the auxiliary earth terminal.

Therefore, according to the present invention, by arranging the antenna terminal between the main earth terminal and the auxiliary earth terminal, the antenna terminal is connected to the digital signal noise and the data input terminal and the data output terminal. It is possible to reduce noise generated from a device (not shown) from entering the antenna terminal.

Therefore, the digital signal noise and noise generated from a device (not shown) connected to the data input terminal and the data output terminal are mixed into the antenna terminal, the bandpass filter circuit, the reception circuit, and the transmission circuit. It is possible to prevent the loss of communication data and the deterioration of the error rate caused by this.

Further, according to the present invention, the printed board is a laminated board including a surface layer, a plurality of intermediate layers, and a back layer, and the high-frequency input / output circuit, the data communication circuit, and the clock are provided on the surface layer. A signal oscillator and a storage circuit are provided,
The first ground pattern is provided on the back surface layer, the signal pattern relating to the data communication circuit, the clock signal oscillator and the storage circuit is provided on at least one of the intermediate layers, and the other one of the other intermediate layers is provided. A second ground pattern is disposed on the layer so as to cover substantially all of the signal pattern, and the signal pattern is disposed between the first ground pattern and the second ground pattern, and the first ground pattern is disposed between the first ground pattern and the second ground pattern. The ground pattern and the second ground pattern are connected by a plurality of through-hole holes.

Therefore, according to the present invention, the printed circuit board is a laminated board including a surface layer, a plurality of intermediate layers, and a back layer, and at least one of the intermediate layers includes the data communication circuit and the clock signal. A signal pattern related to an oscillator and a storage circuit is provided, and the signal pattern is
The digital signal noise generated from the signal pattern can be reduced by electromagnetically shielding the signal pattern by arranging the signal pattern so as to be sandwiched between the ground pattern and the second ground pattern.

Further, by connecting the first ground pattern and the second ground pattern with the plurality of through-hole holes, the potential difference between the first ground pattern and the second ground pattern can be eliminated. Can be. Therefore, it is possible to reduce digital signal noise superimposed on the ground pattern generated between ground patterns having a potential difference.

Therefore, it is possible to more effectively prevent the loss of communication data and the deterioration of the error rate caused by the digital signal noise entering the antenna terminal, the bandpass filter circuit, the receiving circuit and the transmitting circuit. .

The present invention also includes a shield case which covers the high-frequency input / output circuit, the data communication circuit, the clock signal oscillator, and the storage circuit provided on one surface of the printed circuit board. Are soldered to each of the main ground terminals.

Therefore, according to the present invention, the high-frequency input / output circuit provided on one surface of the printed circuit board,
By covering the data communication circuit, the clock signal oscillator, and the storage circuit with the shield case and electromagnetically shielding, noise generated from a device (not shown) connected to the data input terminal and the data output terminal is reduced by the antenna terminal, the bandpass filter. It is possible to prevent loss of communication data and deterioration of an error rate caused by mixing in a circuit, a reception circuit, and a transmission circuit.

Further, in the wireless communication apparatus of the present invention, a frequency band of a high-frequency signal input / output from the antenna terminal is a 2.4 GHz band, and uses a frequency hopping method using a spread spectrum technique. It is characterized by the following.

Therefore, according to the present invention, it is possible to provide a wireless communication apparatus which has a wireless communication function for preventing loss of communication data and deterioration of an error rate, and is small and thin.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an arrangement of each circuit on a printed circuit board of a wireless communication device according to an embodiment of the present invention;
(A) is a plan view as viewed from one surface of the printed board, (b) is a cross-sectional view of the printed board,
(C) is a plan view of the printed circuit board as viewed from the other surface.

FIGS. 2A and 2B are perspective views showing the appearance of a wireless communication device according to an embodiment of the present invention, in which FIG. 2A is a perspective view showing how a shield case is mounted on a printed circuit board, and FIG.
FIG. 4 is a perspective view showing a state where the shield case is mounted on a printed circuit board and soldered.

FIG. 3 is a block circuit diagram showing a schematic configuration of a wireless communication device according to one embodiment of the present invention.

FIG. 4 is a block circuit diagram illustrating a schematic configuration of a conventional wireless communication device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 wireless communication device 11 antenna terminal 12 high-frequency input / output circuit 13 band-pass filter circuit 14 switch circuit 15 data communication circuit 16 reception circuit 17 reception amplification circuit 18 mixer circuit 19 demodulation circuit 20 transmission circuit 21 transmission amplification circuit 22 modulation circuit 23 local oscillator Reference Signs List 24 baseband signal processing circuit 25 control circuit 26 clock signal oscillator 27 storage circuit 28a data output terminal 28b data input terminal 29 signal pattern 30 printed circuit board 31 first side of printed circuit board 32 second side of printed circuit board 33 of printed circuit board Third side 34 Fourth side of printed circuit board 40 First ground pattern 41, 42, 43, 44 Main ground terminal 45 Secondary ground terminal 46 Second ground pattern 47 Through-hole hole 50 Shield case 51, 52, 53 , 54 Soldering part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K011 AA16 BA10 DA06 DA12 DA26 JA01 KA04 5K022 EE01 EE21 EE31 5K023 AA07 BB03 DD08 LL01 PP01 PP11 5K052 AA01 BB01 CC06 DD15 DD27 FF38 GG22 GG31 GG32

Claims (6)

[Claims] An antenna terminal, a high-frequency input / output circuit for inputting / outputting a high-frequency signal from the antenna terminal, a receiving circuit for demodulating the input high-frequency signal and converting it into a reception baseband signal, a transmission baseband A data communication circuit including a transmission circuit that modulates a signal to convert it into a high-frequency signal and outputs the signal, a baseband signal processing circuit that performs signal processing of the transmission and reception baseband signal, and a control circuit that controls the baseband signal processing circuit; A clock signal oscillator for supplying a clock signal to the data communication circuit, a storage circuit storing a program for operating the control circuit, and a data input / output terminal of the data communication circuit are connected to a substantially rectangular printed circuit board. A wireless communication device disposed on one side of the printed circuit board, wherein the data input / output is provided at an edge of a first side of the printed circuit board. And the data communication circuit is disposed adjacent to both sides of the first side and the second side adjacent to the first side, and the data communication circuit is disposed near the third side adjacent to the first side. The memory circuit is disposed adjacent to both sides, and a fourth circuit opposing the first side.
The antenna terminal is disposed at an edge of the side of the side, the high-frequency input / output circuit is disposed at a position sandwiched between the antenna terminal and the data communication circuit, and the third side and the fourth side are A wireless communication device, wherein the clock signal oscillator is provided at one corner between the two. 2. A high-frequency input / output circuit, a data communication circuit, a clock signal oscillator, and a storage circuit provided on one surface of the printed circuit board so as to cover substantially all of the other surface of the printed circuit board sandwiching the printed circuit board. A first ground pattern is provided, having a plurality of main ground terminals connected to the first ground pattern, and each of the plurality of main ground terminals is provided near four corners of the printed circuit board. The wireless communication device according to claim 1, wherein: 3. A sub-ground terminal connected to the main ground terminal is provided near one main ground terminal of the plurality of main ground terminals, and the antenna terminal is connected to the one main ground terminal. 3. The wireless communication device according to claim 2, wherein the wireless communication device is disposed so as to be sandwiched between the auxiliary ground terminal. 4. The printed circuit board is a laminated board including a surface layer, a plurality of intermediate layers, and a back layer, and the high-frequency input / output circuit, the data communication circuit, the clock signal oscillator, and the memory are provided on the surface layer. A circuit is provided, the first ground pattern is provided on the back layer, and a signal pattern related to the data communication circuit, the clock signal oscillator, and the storage circuit is provided on at least one of the intermediate layers. A second ground pattern is provided on another layer of the intermediate layer so as to cover substantially all of the signal pattern, and the signal pattern is provided between the first ground pattern and the second ground pattern. The wireless communication device according to claim 2, wherein the first ground pattern and the second ground pattern are connected by a plurality of through-holes. 5. A shield case for covering the high-frequency input / output circuit, the data communication circuit, the clock signal oscillator and the storage circuit provided on one surface of the printed circuit board, wherein the shield case and the plurality of main ground terminals are provided. The wireless communication device according to any one of claims 2 to 4, wherein each of the two is soldered. 6. The radio communication apparatus according to claim 1, wherein a frequency band of a high-frequency signal input / output from the antenna terminal is 2.4 GHz.
2. A frequency band hopping method using a spread spectrum technique in the z band is used.
The wireless communication device according to any one of claims 1 to 5.