JPH10190517A - Radio communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication equipment which is made possible to be easily used in either of frequencies of a feeble electric wave standard and also the one with a small power standard. SOLUTION: The radio communication equipment is constituted by providing a modulation/demodulation and frequency converting part consisting of an input terminal 21, a modulator 22, a frequency converter 23, BPF 24, a voltage control oscillator 29, a synthesizer 30, BPF 32, the frequency vonerter 33, a demodulator 34 and an output terminal 35, a first high frequency module 36 consisting of a power amplifier 25, a transmission/reception change-over circuit 26, BPF 27 and a high frequency amplifier 31 and the second high frequency module 40 consisting of the frequency converter 31, BPF 42, the power amplifier 43, the transmission/reception change-over circuit 44, BPF 45, the high frequency amplifier 46, BPF 47 and the frequency converter 48 and by forming the input/ output terminals of the first and the second high frequency modules 36 and 40 and the layouts of a power terminal and a control terminal to be respectively the same.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication device for communicating data wirelessly.

[0002]

2. Description of the Related Art Conventionally, as a radio communication device for communicating data, a radio communication device having a configuration as shown in FIG. 4 is known.
As shown in FIG. 4, the wireless communication device has input terminals 1 and 2.
Modulator 2, frequency converter 3, power amplifier 5, transmission / reception switching circuit 6, antenna 8, voltage controlled oscillator 9, synthesizer 10, high frequency amplifier 11, frequency converter 13, demodulator 14,
It comprises an output terminal 15, BPFs 4, 7, and 12.

[0003] Next, the operation of the wireless communication apparatus configured as described above will be described. First, in the transmission state, transmission data enters the input terminal 1, and a signal modulated by the modulator 2 such as FSK and a signal generated by the voltage controlled oscillator 9 are multiplied by the frequency converter 3 to obtain a signal having a carrier frequency. Are transmitted from the antenna 8 through the transmission / reception switching circuit 6 in the transmission state via the power amplifier 5. Conversely, in the reception state, the radio wave entering the antenna 8 passes through the transmission / reception switching circuit 6 in the reception state, is amplified by the high frequency amplifier 11, and is then multiplied by the signal generated by the voltage controlled oscillator 9 in the frequency converter 13. The data is converted to an intermediate frequency, returned to data by the demodulator 14, and received data is output from the output terminal 15.

[0004]

The use of spread spectrum radio communication devices in Japan is limited by the Radio Law, and the output power is in the 2.45 GHz band in the low power standard or in the weak radio standard. Then, it becomes practically 322 MHz or less. In the conventional wireless communication device, it is possible to change the frequency in the vicinity because the frequency of the voltage-controlled oscillator 9 changes by changing the frequency division ratio of the synthesizer, but the frequency is greatly separated from the 2.45 GHz band to 322 MHz or less. Is changed by the voltage controlled oscillator 9,
The frequency characteristics required for the BPFs 4, 7, 12 and the power amplifiers 5 and the high-frequency amplifiers 11 are different and impossible, and separate radio communication devices have to be prepared for communication at both frequencies.

A wireless communication device that communicates with the output power of the weak radio standard can reduce power consumption, but when the communication environment is poor, the communication quality deteriorates. On the other hand, a wireless communication device that communicates with output power of a low power standard does not impair communication quality even if the communication environment is poor, but has a problem that power consumption increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the conventional wireless communication apparatus, and the invention according to claim 1 can easily cope with a frequency change greatly apart by selecting a high-frequency module. It is an object of the present invention to provide a wireless communication device that can perform the wireless communication. Another object of the present invention is to provide a wireless communication apparatus capable of suppressing power consumption while ensuring communication quality.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 is a power amplifier capable of performing radio communication at a first frequency of 322 MHz or less, wherein the output power is a weak radio standard. A first high-frequency module having a high-frequency amplifier and a transmission / reception switching circuit; and a first high-frequency module whose output power is a low-power standard and wireless communication is possible at a second frequency different from the first frequency. A second high-frequency module having a frequency converter for converting the second frequency to a second frequency, a frequency converter for converting the second frequency to the first frequency, an oscillator, a power amplifier, a high-frequency amplifier, and a transmission / reception switching circuit. The layout of the input / output terminals, power supply terminals and control terminals of the first high-frequency module and the layout of the input / output terminals, power supply terminals and control terminals of the second high-frequency module And it constitutes a wireless communication device to the out same.

As described above, the first input / output terminal, the power supply terminal, and the control terminal of the first and second high-frequency modules have the same layout, so that the first high-frequency module can be selectively connected and used. By
It can be a radio communication device of a weak radio standard, and by selectively connecting and using the second high-frequency module, it can be a radio communication device of a low-power standard. Since a wireless communication device having a significantly different frequency and an output power of a weak radio standard or a low power standard can be used, a mass production effect can be obtained and cost can be reduced.

According to a second aspect of the present invention, a first power amplifier, a high-frequency amplifier, and a transmission / reception switching circuit capable of performing wireless communication at a first frequency of 322 MHz or less, which output power is a weak radio standard. A high-frequency block, a frequency converter whose output power is a low power standard and can perform wireless communication at a second frequency, wherein the first frequency is a second frequency, and the second frequency is a first frequency A second high-frequency block including a frequency converter, an oscillator, a power amplifier, a high-frequency amplifier, and a transmission / reception switching circuit, which communicates with the first frequency when the communication environment is good, and the second frequency when the communication environment is bad. A wireless communication device is configured by a band switching circuit for switching and using the first high-frequency block and the second high-frequency block so that communication can be performed at a frequency.

With this configuration, the switching operation of the band switching circuit enables communication with either the output power of the weak radio standard or the output power of the low power standard. Therefore, when the communication environment is good, the output of the weak radio standard can be performed. When the communication environment is poor with power, communication can be performed with output power of a small power standard, communication quality can be ensured, power consumption can be suppressed, and the life of a battery can be extended.

[0011]

Next, an embodiment will be described. FIG. 1 is a block diagram showing an embodiment in which a first high-frequency module is selectively connected and used in an embodiment of the wireless communication apparatus according to the first aspect of the present invention. FIG. 2 is a block diagram showing the first embodiment. FIG. 3 is a block diagram showing a second high-frequency module part in FIG. As shown in FIG. 1, the wireless communication apparatus according to this embodiment has an input terminal 21, a modulator 22, a frequency converter 23, a power amplifier 25, a transmission / reception switching circuit 26, an antenna 28, a voltage control Oscillator 29,
It comprises a synthesizer 30, a high-frequency amplifier 31, a frequency converter 33, a demodulator 34, an output terminal 35, and BPFs 24, 27, 32. Then, a power amplifier 25, a transmission / reception switching circuit 26,
The BPF 27 and the high-frequency amplifier 31 constitute a first high-frequency module 36, and the remaining components constitute a modulation / demodulation and frequency conversion unit common to each high-frequency module.

Next, as described above, the first high-frequency module
The operation in the case where 36 is connected to the modulation / demodulation and frequency conversion unit will be described. First, in the transmission state, transmission data enters the input terminal 21 and the modulator 22, for example, FSK
And the signal generated by the voltage controlled oscillator 29 are multiplied by the frequency converter 23 to obtain a signal of 322 MHz.
The following carrier frequency signal passes through a transmission / reception switching circuit 26 in a transmission state via a BPF 24 and a power amplifier 25 of a weak radio standard, and a radio wave is transmitted from an antenna 28 via a BPF 27. On the contrary, in the receiving state, the radio wave entering the antenna 28 is BP
Transmission / reception switching circuit in the receiving state via F27
After passing through 26, the signal is amplified by the high-frequency amplifier 31, passes through the BPF 32, and is then multiplied by the signal generated by the voltage-controlled oscillator 29 in the frequency converter 33 to become the intermediate frequency.
The data is returned to the data at 34, and the output data is output from the output terminal 35. As a result, communication based on the weak radio standard can be performed at 322 MHz or less.

A second high-frequency module 40 shown in FIG. 2 includes a frequency converter 41, a power amplifier 43, a transmission / reception switching circuit 44,
High frequency amplifier 46, frequency converter 48, oscillator 49 and BPF
The second high-frequency module 40 has a layout of input terminals, power supply terminals, and control terminals according to the layout of input / output terminals, power supply terminals, and control terminals of the first high-frequency module 36. Therefore, the second high-frequency module 40 can be easily used in connection with the modulation / demodulation and frequency conversion unit instead of the first high-frequency module 36.

When the second high-frequency module 40 is connected to the modulation / demodulation and frequency conversion unit as described above, a carrier frequency signal of 322 MHz or less is used during transmission.
A transmission / reception switching circuit which is multiplied by the frequency of an oscillator 49 at 41 to become a carrier frequency in the 2.45 GHz band and is in a transmission state via a BPF 42 and a power amplifier 43 of a low power standard.
Radio waves are transmitted from the antenna through the BPF 45 through the 44. On the other hand, in the reception state, the radio wave entering the antenna passes through the transmission / reception switching circuit 44 in the reception state, passes through the high-frequency amplifier 46 and the BPF 47, and is multiplied by the signal generated by the oscillator 49 in the frequency converter 48. , And is returned to data in the modulation / demodulation and frequency conversion unit. Therefore, communication can be performed according to the low power standard of the 2.45 GHz band.

Here, a first high-frequency module 36 comprising a power amplifier 25, a transmission / reception switching circuit 26, a BPF 27, and a high-frequency amplifier 31 includes an input terminal 21, a modulator 22, a frequency converter
23, voltage controlled oscillator 29, synthesizer 30, high frequency amplifier
31, frequency converter 33, demodulator 34, output terminal 35, BPF2
The layout of the input / output terminals, power supply terminals, and control terminals on the circuit board on which the modulation / demodulation and frequency conversion units composed of the components 4 and 32 are provided is changed to the input / output terminals, power supply terminals, and control terminals of the second high-frequency module 40. May be made in the same layout. In this case, when the second high-frequency module is incorporated, the components constituting the first high-frequency module are not mounted on the substrate, and the layout of the terminals is the same, and the second high-frequency module is separately configured. May be connected to the substrate. Also, the frequencies in the first and second high-frequency modules do not need to be the same at the time of transmission and at the time of reception, and the oscillator 49 of the second high-frequency module uses the signal of the synthesizer 30 in the demodulation and frequency conversion unit as a reference. A voltage controlled oscillator may be used.

This embodiment is particularly effective for constructing a radio communication apparatus using spread spectrum. That is, for example, in the case of Japan, a wireless communication device using spread spectrum has an output power of a weak radio standard of about -48 dBm or less according to the Radio Law and a frequency of substantially 322 MHz.
The output power of the low power standard is limited to 10 dB
m or less, and the frequency is regulated to the 2.45 GHz band. Similarly, even in the case of a radio communication device using spread spectrum which is regulated to be 30 dBm or less in the 900 MHz band and 20 dBm or less in the 2.45 GHz band, if the corresponding high-frequency module is configured, the present invention naturally follows. Can be applied.

Next, an embodiment according to claim 2 will be described with reference to FIG. In this embodiment, an input terminal 51, a modulator 52, a first frequency converter 53, a synthesizer 62, a voltage controlled oscillator 63, a frequency converter 65, a demodulator 66, an output terminal 6
7, a modulation / demodulation and frequency conversion unit comprising BPFs 54 and 64,
A band switching circuit 55, a first high-frequency block including a power amplifier 56, a transmission / reception switching circuit 57, an antenna 59, and a high-frequency amplifier 60, and a frequency converter 68, a power amplifier 70, a transmission / reception switching circuit 71, an oscillator 72, and a frequency converter 73, high frequency amplifier 75, antenna 77, BPF54, 58, 64, 69, 74,
And a second high-frequency block composed of 76.

Next, the operation of the wireless communication apparatus configured as described above will be described. In the transmission state, transmission data enters the input terminal 51, and this is transmitted to the modulator 52 by, for example, FSK.
The modulated signal and the signal generated by the voltage controlled oscillator 63 are multiplied by the frequency converter 53 and pass through the BPF 54. When the communication environment is good, the band switching circuit 55 is switched to the power amplifier 56 and the high frequency amplifier 60, 322MH
z The carrier frequency signal less than or equal to
Transmission / reception switching circuit 57 in the transmission state via 56
, And a radio wave is transmitted from the antenna 59 through the BPF 58.
On the other hand, in the receiving state, the radio wave entering the antenna 59 has a BPF 58
And the transmission / reception switching circuit 57 in the reception state,
The signal is amplified by the high frequency amplifier 60, passes through the band switching circuit 55, is multiplied by the signal generated by the voltage controlled oscillator 63 in the frequency converter 65 through the BPF 64, becomes an intermediate frequency, is returned to the data by the demodulator 66, and is outputted to the output terminal 67. Output, and communication of a weak radio standard can be performed at 322 MHz or less.

On the other hand, when the communication environment is not good at the time of transmission, the band switching circuit 55 is switched to the frequency converters 68 and 73, and a signal having a carrier frequency of 322 MHz or less is transmitted by the frequency converter 68 to the frequency of the oscillator 72. Multiplied, 2.
Radio waves are transmitted from the antenna 77 via the BPF 76 through the transmission / reception switching circuit 71 which is in the transmission state via the BPF 69 and the power amplifier 70 of the low power standard, having a carrier frequency in the 45 GHz band. Conversely, in the receiving state, the radio wave entering the antenna 77 passes through the transmission / reception switching circuit 71 in the receiving state via the BPF 76, passes through the high-frequency amplifier 75, and
The signal is multiplied by the signal generated by the oscillator 72 in the frequency converter 73 via the F74, and becomes a carrier frequency signal of 322 MHz or less. The carrier signal is returned to the data in the modulation / demodulation and frequency conversion section, and communication can be performed even in the low power standard of the 2.45 GHz band. At this time, the power supply to the circuit of the weak output power standard not used may be stopped.

It is to be noted that each configuration of the above embodiments of the invention can be variously modified and changed. For example, although a configuration using a simplex system as a communication system is shown, a configuration using a one-way communication system or a duplex system may be used.

[0021]

As described above with reference to the embodiments, according to the first aspect of the present invention, it is possible to easily select and connect a high-frequency module whose output power conforms to a weak radio standard or a low power standard, thereby reducing costs. A wireless communication device conforming to the weak radio wave standard and the low power standard can be realized. Further, according to the second aspect, it is possible to perform switching communication according to a weak radio wave standard and a low power standard according to a communication environment, and to realize a wireless communication apparatus capable of suppressing power consumption while ensuring communication quality. be able to.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a wireless communication apparatus according to an embodiment of the present invention when a first high-frequency module is connected.

FIG. 2 is a block diagram showing a configuration of a second high-frequency module according to the embodiment shown in FIG. 1;

FIG. 3 is a block diagram showing an embodiment of a wireless communication apparatus according to the invention described in claim 2;

FIG. 4 is a block diagram showing a configuration example of a conventional wireless communication device.

[Explanation of symbols]

 21 input terminal 22 modulator 23 frequency converter 24, 27, 32 BPF 25 power amplifier 26 transmission / reception switching circuit 28 antenna 29 voltage-controlled oscillator 30 synthesizer 31 high-frequency amplifier 33 frequency converter 34 demodulator 35 output terminal 36 first high-frequency module 40 Second high frequency module 41 Frequency converter 42, 45, 47 BPF 43 Power amplifier 44 Transmission / reception switching circuit 46 High frequency amplifier 48 Frequency converter 51 Input terminal 52 Modulator 53 Frequency converter 54, 58, 64, 69, 74, 76 BPF 55 Band switching circuit 56 Power amplifier 57 Transmission / reception switching circuit 59, 77 Antenna 60 High frequency amplifier 62 Synthesizer 63 Voltage controlled oscillator 65 Frequency converter 66 Demodulator 67 Output terminal 68 Frequency converter 70 Power amplifier 71 Transmission / reception switching circuit 72 Oscillator 73 Frequency converter 75 High frequency amplifier

Claims (2)

[Claims] 1. The output power is a weak radio standard, 322M
A first high-frequency module having a power amplifier, a high-frequency amplifier, and a transmission / reception switching circuit capable of wireless communication at a first frequency equal to or lower than Hz, and a second high-frequency module whose output power is a low power standard and different from the first frequency. A frequency converter for converting the first frequency to a second frequency, a frequency converter for converting the second frequency to the first frequency, an oscillator, a power amplifier, a high-frequency amplifier, A second high-frequency module having a transmission / reception switching circuit,
Wireless communication, wherein the layout of the input / output terminal, power supply terminal and control terminal of the first high-frequency module is the same as the layout of the input / output terminal, power supply terminal and control terminal of the second high-frequency module apparatus. 2. The output power is a weak radio standard, and wireless communication is possible at a first frequency of 322 MHz or less.
A first high-frequency block including a power amplifier, a high-frequency amplifier, and a transmission / reception switching circuit, and a frequency for setting the first frequency to the second frequency, wherein the output power is a low power standard and wireless communication is possible at a second frequency. A second converter comprising a converter, a frequency converter for setting the second frequency to the first frequency, an oscillator, a power amplifier, a high-frequency amplifier, and a transmission / reception switching circuit.
The first high-frequency block and the second high-frequency block so that they can communicate at the first frequency when the communication environment is good and can communicate at the second frequency when the communication environment is bad. A wireless communication device, comprising: a band switching circuit for switching to use.