JP2020195057A - Dual-mode high-speed radio receiver and dual-mode high-speed radio communication system - Google Patents

Abstract

To provide a receiver capable of operating any of heterodyne and self-heterodyne.SOLUTION: A dual-mode high-speed radio receiver 20 includes: a balun 211 that converts a received single-ended RF signal into a differential RF signal; a reception LO driver 22 that generates a differential reception LO signal; a double balanced mixer 23 connected with the balun 211 and the reception LO driver 22; and a reception mode switch 25 that switches between a first reception mode in which both the reception LO driver 22 and the double balanced mixer 23 operate and a second reception mode in which the reception LO driver 22 stops and the double balanced mixer 23 operates.SELECTED DRAWING: Figure 2A

Description

The present invention relates to high frequency wireless communication, and more particularly to a receiver and a wireless communication system suitable for high frequency wireless communication using a high frequency wireless signal in the millimeter wave band or higher.

Recently, the practical application of 5G communication has just begun, but research and development of ultra-high-speed wireless data communication exceeding 100 Gb / s has already begun toward the next-generation Beyond 5G era. For example, the IEEE 802.15.3d standard defines a wireless physical layer for ultrafast wireless communication using the 300 GHz band (252-322 GHz).

The 300 GHz band used in next-generation wireless communication is a high frequency band that cannot be amplified by silicon-based transistors such as MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) and some compound semiconductor transistors. Therefore, as a system for transmitting and receiving such high frequency band radio signals, a frequency multiplication circuit or mixer circuit that multiplies the frequency of the IF (Intermediate Frequency) signal to generate a high frequency RF (Radio Frequency) signal is placed in the final stage. A heterodyne radio communication system consisting of a transmitter and a receiver in which a mixer circuit that performs fundamental wave mixing or sub-harmonic mixing with an LO (Local Oscillator) signal obtained by frequency-multiplying the received high-frequency RF signal is arranged in the first stage. Proposed.

Heterodyne wireless communication systems generate LO signals with very high frequencies, which tends to increase power consumption, which may limit the usage. Therefore, as a technique for reducing the power consumption of the high-speed wireless communication system, particularly the power consumption of the receiver, the transmitter transmits the RF signal without suppressing the LO harmonic component included in the transmission RF signal, and the receiver transmits the RF signal. A self-heterodyne has been proposed in which an RF signal is received and down-conversion is performed using the LO harmonic component contained in the received RF signal without internally generating an LO signal (for example, Non-Patent Document 1, Non-Patent Document 1, 2).

Y. Shoji et al., “Millimeter-Wave Remote Self-Heterodyne System for Extremely Stable and Low-Cost Broad-Band Signal Transmission,” IEEE Trans. Microw. Theory Tech., Vol. 50, no. 6, pp. 1458 -1468, June 2002. Y. Shoji and H. Ogawa, “70-GHz-Band MMIC Transceiver With Integrated Antenna Diversity System: Application of Receiver-Module-Arrayed Self-Heterodyne Technique,” IEEE Trans. Microw. Theory Tech., Vol. 52, no. 11, pp. 2541-2549, Nov. 2004.

According to the self-heterodyne, it is not necessary to generate the LO signal on the receiver side, so that the power consumption of the receiver can be reduced. In addition, the LO signal used for up-conversion on the transmitter side is used to generate the received RF signal. Since the down conversion is performed, the S / N ratio is improved as compared with the case where the LO signal generated on the receiver side is used. On the other hand, self-heterodyne has a problem that when the distance between transmitters and receivers becomes large, the power of the LO harmonic component included in the received RF signal becomes weak and the S / N ratio deteriorates.

FIG. 7 is a graph showing the relationship between the distance between transmitters and receivers and the S / N ratio of heterodyne and self-heterodyne. When the distance between transmitters and receivers is relatively large, the S / N ratio of heterodyne is higher than that of self-heterodyne, but when the distance between transmitters and receivers becomes very close, the S / N ratio of heterodyne reaches a plateau and is dominated by phase noise. Become so. On the other hand, since self-heterodyne does not generate an LO signal on the receiver side, it is less susceptible to phase noise than heterodyne, and the closer the distance between transmitters and receivers, the better the S / N ratio than heterodyne. As described above, heterodyne and self-heterodyne each have advantages and disadvantages.

Therefore, it is an object of the present invention to provide a receiver capable of operating either heterodyne or self-heterodyne and a communication system including such a receiver.

A dual-mode high-speed radio receiver according to one aspect of the present invention includes a balun that converts a received single-ended RF signal into a differential RF signal, a receiving LO driver that generates a differential received LO signal, and a balun. The double-balanced mixer connected to the receive LO driver, the first receive mode in which both the receive LO driver and the double-balanced mixer operate, and the second reception in which the receive LO driver stops and the double-balanced mixer operates. It is equipped with a reception mode switch that switches between modes.

Further, the dual-mode high-speed wireless communication system according to another aspect of the present invention is a transmitter that transmits a transmission RF signal up-converted by a transmission LO signal, and suppresses a transmission LO harmonic component included in the transmission RF signal. A dual mode high-speed wireless transmitter capable of switching between a first transmission mode for transmitting a transmission RF signal and a second transmission mode for transmitting a transmission RF signal without suppressing the transmission LO harmonic component, and a dual mode. The dual mode high speed radio receiver comprises the above dual mode high speed radio receiver which receives the transmission RF signal transmitted from the high speed radio transmitter, and the dual mode high speed radio transmitter is the first when the dual mode high speed radio transmitter operates in the first transmission mode. It is configured to operate in one receive mode and to operate in a second receive mode when the dual mode high speed wireless transmitter operates in the second transmit mode.

According to the present invention, the receiver can be operated as a heterodyne receiver when the transmitters and receivers are separated, and as a self-heterodyne receiver when the transmitters and receivers are close to each other. As a result, a good S / N ratio can be obtained regardless of whether the transmitter / receiver is far or near. Further, when the transmitters and receivers are close to each other, the power consumption of the receiver can be significantly reduced by stopping the operation of the receiver LO driver of the receiver.

Block diagram of a main part of a dual-mode high-speed wireless communication system according to an embodiment of the present invention. Block diagram of a main part of a dual-mode high-speed wireless communication system according to an embodiment of the present invention. Circuit diagram of the main part of the dual mode high-speed wireless receiver according to the embodiment of the present invention. Circuit diagram of the main part of the dual mode high-speed wireless receiver according to the embodiment of the present invention. Graph of conversion gain of down conversion mixer in normal reception mode Graph of conversion gain of down conversion mixer in short-range reception mode Constellation diagram of 16QAM received signal in normal reception mode Constellation diagram of 16QAM reception signal in short-distance reception mode Constellation diagram of 32QAM reception signal in short-distance reception mode Constellation diagram of 64QAM received signal in short-range communication mode Flowchart for automatic mode switching The figure which shows one operation state of the dual mode high-speed wireless communication system in automatic mode switching Graph showing the relationship between the distance between transmitters and receivers and the S / N ratio of heterodyne and self-heterodyne

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed explanations of already well-known matters and duplicate explanations for substantially the same configuration may be omitted. This is to avoid unnecessary redundancy of the following description and to facilitate the understanding of those skilled in the art. It should be noted that the inventor provides the accompanying drawings and the following description in order for those skilled in the art to fully understand the present invention, and is not intended to limit the subject matter described in the claims by these. Absent.

<< Embodiment >>
1A and 1B are block diagrams of a main part of a dual-mode high-speed wireless communication system according to an embodiment of the present invention. The dual-mode high-speed wireless communication system 100 according to the present embodiment is composed of a dual-mode high-speed wireless transmitter 10 and a dual-mode high-speed wireless receiver 20, and performs high-speed wireless communication using RF signals in the 300 GHz band between these transmitters and receivers. Do. Further, the dual mode high-speed wireless communication system 100 according to the present embodiment operates in the normal communication mode shown in FIG. 1A when the transmitters and receivers are relatively far apart, and when the transmitters and receivers are close to each other, FIG. It operates in the short-range communication mode shown in 1B. These two modes can be switched between each other manually or automatically. In FIG. 1A, the grayed out in the spectrum of the RF signal transmitted from the dual-mode high-speed radio transmitter 10 and the RF signal received by the dual-mode high-speed radio receiver 20 is the LO harmonic component (LO ² ) included in the RF signal. It shows that it is sufficiently suppressed. Further, in FIG. 1B, the grayed-out circuit element is not operating, that is, the power supply is cut off and stopped. In the following, for convenience, the dual-mode high-speed wireless communication system, the dual-mode high-speed wireless transmitter, and the dual-mode high-speed wireless receiver may be simply referred to as a communication system, a transmitter, and a receiver, respectively.

The transmitter 10 includes a transmitting antenna 11, a transmitting LO driver 12, an up-conversion mixer 13, an amplifier 14, and a square mixer 15. The transmission LO driver 12 is a circuit element that generates a transmission LO signal (LO _TX ) by multiplying the frequency of the input reference clock signal (not shown). More specifically, the transmission LO driver 12 includes a VCO (Voltage Controlled Oscillator) 121, a frequency divider 122, a PFD / CP (Phase / Frequency Detector / Charge Pump) 123, and an LF (Loop Filter) 124. It is composed of a PLL (Phase Locked Loop). The LO _{TX of a} desired frequency is output from the VCO 121 by the phase lock operation of the PLL.

The up-conversion mixer 13 is a circuit element that receives a transmission baseband signal (IF _IN ) and LO _TX output from the transmission LO driver 12, mixes them (primary wave mixing), and outputs an up-converted IF signal. .. In general, it is preferable that the LO signal component is sufficiently suppressed in the IF signal output from the up-conversion mixer 13, but it is difficult to sufficiently suppress the LO signal component in the high frequency band. Therefore, the IF signal output from the up-conversion mixer 13 contains a LO signal component having a certain intensity. The IF signal including the LO signal component output from the up-conversion mixer 13 is referred to as IF + LO for convenience.

Further, the up-conversion mixer 13 can suppress the LO signal component included in the output IF signal, or conversely, positively leak the transmitted LO signal so that the output signal contains the LO signal component. It is configured in. Techniques for positively leaking such LO signals are disclosed in, for example, JP-A-2017-1330804 and JP-A-2018-125712.

The amplifier 14 is a circuit element that amplifies the IF + LO output from the up-conversion mixer 13 to a predetermined IF power. The square mixer 15 is a circuit element that squares IF + LO amplified by the amplifier 14 and outputs a transmission RF signal (RF _OUT ). That is, the carrier frequency is increased by the square mixer 15 to twice the transmission LO signal frequency (LO ² ). The RF _OUT output from the square mixer 15 is emitted into space through the transmitting antenna 11. By arranging such a square mixer 15 in the final stage of the transmitter 10, it is possible to generate RF _OUT in the 300 GHz band in a circuit composed of MOSFETs.

The receiver 20 includes a receiving antenna 21, a receiving LO driver 22, a down conversion mixer 23, and an LNA (Low Noise Amplifier) 24. The reception LO driver 22 is a circuit element that generates a reception LO signal (LO _RX ) by multiplying the frequency of the input reference clock signal (not shown). More specifically, the receiving LO driver 22 is composed of a PLL including a VCO 221, a frequency divider 122, a PFD / CP 223, and an LF 224. The LO _{RX of the} desired frequency is output from the VCO 221 by the phase lock operation of the PLL. The down conversion mixer 23 receives the received RF signal (RF _IN ) received by the receiving antenna 21 and the LO _RX output from the receiving LO driver 22, and mixes them (primary wave mixing) to down-convert the IF signal (IF). ) Is a circuit element that outputs. The LNA 24 is a circuit element that amplifies the IF output from the down conversion mixer 23 to an IF power that can be processed by the signal processing circuit (not shown) connected to the subsequent stage. The IF signal (IF _OUT ) output from the LNA 24 is input to the signal processing circuit (not shown) to perform various signal processing.

The operation of the communication system 100 having the above configuration is as follows. In the normal communication mode shown in FIG. 1A, all the elements of the transmitter 10 is operated, the transmitter 10 operates in the normal transmission mode for transmitting the RF _OUT to sufficiently suppress the transmission LO harmonic components included in the RF _OUT To do. Further, all the elements of the receiver 20 operate, and the receiver 20 operates in the normal reception mode in which the RF _IN is down-converted by the LO _RX generated by the reception LO driver 22. That is, in the normal reception mode, the receiver 20 operates as a heterodyne receiver. On the other hand, in the short-range communication mode shown in FIG. 1B, in the transmitter 10, the frequency dividers 122, PFD / CP123 and LF124 in the transmission LO driver 12 stop operating, and the VCO 123 self-propells to generate LO _TX . Then, the up-conversion mixer 13 operates so as to leak the LO _TX , and the transmitter 10 operates in the short-range transmission mode in which the RF _OUT including the transmission LO harmonic component is transmitted. The reception LO driver 22 stops operating in the receiver 20, and the receiver 20 operates in a short-distance reception mode in which the RF _IN is down-converted using the transmission LO harmonic component included in the received RF _IN . That is, in the short-range reception mode, the receiver 20 operates as a self-heterodyne receiver.

≪Detailed configuration of receiver≫
Next, a detailed configuration example of the receiver 20 will be described. 2A and 2B are circuit diagrams of the main part of the receiver 20. FIG. 2A shows the circuit state in the normal reception mode, and FIG. 2B shows the circuit state in the short-distance reception mode. The circuit diagram shown on the right side of each circuit state is an enlarged circuit diagram of the down conversion mixer 23, and shows the input / output signals of the down conversion mixer 23.

The receiver 20 includes a balun 211, a receiving LO driver 22, a down conversion mixer 23, an RF matching circuit 231 and an LO matching circuit 232, an LO power switch 25, a terminal circuit 26, and an LO signal switch 27. It has a bias tee 28. Of these components, the portion consisting of the balun 211, the receiving LO driver 22, the down conversion mixer 23, the RF matching circuit 231 and the LO matching circuit 232, the LO power switch 25, the termination circuit 26, and the LO signal switch 27 is on the semiconductor chip. Can be placed.

The balun 211 is a circuit element that converts a single-ended RF signal received by the receiving antenna 21 into a differential RF signal. The reception LO driver 22 is a circuit element that generates a differential reception LO signal by multiplying the frequency of the input reference clock signal (not shown). The configuration of the receiving LO driver 22 is as described above. The down conversion mixer 23 is a circuit element to which a differential signal is input and outputs a differential signal. The balun 211 and the receiving LO driver 22 are connected to the down conversion mixer 23. The RF matching circuit 231 is a circuit element that performs impedance matching between the balun 211 and the down conversion mixer 23. The LO matching circuit 232 is a circuit element that performs impedance matching between the receiving LO driver 22 and the down conversion mixer 23.

More specifically, the down conversion mixer 23 is composed of a double-balanced mixer in which four transistors M1 to M4 are cross-connected. The source of the transistor M1 and the source of the transistor M4 are connected to each other, the source of the transistor M2 and the source of the transistor M3 are connected to each other, and the differential output of the balun 211 is connected to them. The gate of the transistor M1 and the gate of the transistor M3 are connected to each other, the gate of the transistor M2 and the gate of the transistor M4 are connected to each other, and the differential output and the termination circuit of the receiving LO driver 22 are connected to them via the LO signal switch 27. 26 are connected. The drain of the transistor M1 and the drain of the transistor M2 are connected to each other, the drain of the transistor M3 and the drain of the transistor M4 are connected to each other, and a differential IF signal is output from them.

The LO power switch 25 is a circuit element that switches whether or not to supply power to the receiving LO driver 22. That is, the LO power switch 25 is a reception mode switch that substantially switches the reception mode of the receiver 20. The terminating circuit 26 is a circuit element that substitutes for the receiving LO driver 22 as a connection destination of the down conversion mixer 23. Specifically, the terminating circuit 26 can be composed of a capacitor, an on-chip transmission line, or the like. The impedance of the terminating circuit 26 is preferably set to a value that maximizes the gain of the down conversion mixer 23. The LO signal switch 27 is a circuit element that selectively connects either the receiving LO driver 22 or the terminating circuit 26 to the down conversion mixer 23. The bias tee 28 is a circuit element that applies a DC bias to the differential IF signal output from the down conversion mixer 23. A differential IF signal (IF _OUT / IF _OUTB ) is output from the bias tee 28.

The LO power switch 25 and the LO signal switch 27 operate in conjunction with each other. Specifically, in the normal reception mode shown in FIG. 2A, the LO power switch 25 connects the reception LO driver 22 to the power supply _VDD , and the LO signal switch 27 connects the down conversion mixer 23 and the reception LO driver 22. .. On the other hand, in the short-distance reception mode shown in FIG. 2B, the LO power switch 25 disconnects the reception LO driver 22 from the power supply _VDD , and the LO signal switch 27 connects the down conversion mixer 23 and the termination circuit 26. In the short-distance reception mode, the receiver 20 receives the RF signal (RF + LO ² ) including the transmission LO signal component, and the differential signal is output from the balun 211. The gates of the four transistors M1 to M4 that make up the down conversion mixer 23 are terminated by the termination circuit 26, so that the down conversion mixer 23 down-converts the RF + LO ² differential signal input to the source by self-heterodyne action. It operates as a source pump circuit that outputs the converted IF signal.

≪Verification experiment results≫
Next, the post-layout simulation results of the circuits shown in FIGS. 2A and 2B will be described. The voltages V _g = 0.4 V and V _d = 0.9 V in FIGS. 2A and 2B were set. FIG. 3A is a graph of the conversion gain of the down conversion mixer 23 in the normal reception mode. FIG. 3B is a graph of the conversion gain of the down conversion mixer 23 in the short-distance reception mode. The vertical axis represents the reception conversion gain, the horizontal axis represents the RF frequency, the frequency f _LO of the received LO signal _{, RX} = 300.5 GHz, and the power P _RF of the received RF signal = −20 dBm. In the short-distance reception mode, the conversion gain peaks at around 300 GHz, whereas in the short-distance reception mode, a good conversion gain can be maintained in a wide frequency band. Focusing on the vicinity of 300 GHz, the input LO power ( _{PLO, RX} ) is the same, that is, the power of the received LO signal generated inside the receiver 20 in the normal reception mode and the transmission included in the received RF signal in the short-distance reception mode. It can be seen that if the power of the LO harmonic component is the same, almost the same conversion gain can be obtained in either reception mode. For reference, the conversion gain when V _d = 0 V, that is, when the down conversion mixer 23 is passively operated, is shown by a broken line in FIG. 3B.

Next, prototypes of the transmitter 10 and the receiver 20 will be created, and the experimental results of QAM (Quadrature Amplitude Modulation) communication using them will be described. FIG. 4A is a constellation diagram of the 16QAM received signal in the normal receiving mode. V _g = 0.4V, V _d = 0.9V, and the distance between transmitters and receivers is 40 cm. The maximum data rate is 7.56 Gb / s, the EVM (Error Vector Magnitude) is 11.7%, and the power consumption of the CMOS circuit of the receiver 20 is 645 mW. FIG. 4B is a constellation diagram of the 16QAM reception signal in the short-distance reception mode. V _g = 0.4V, V _d = 0.9V, and the distance between transmitters and receivers is 1 cm. The maximum data rate is 25.92 Gb / s and the EVM is 13.4%. FIG. 4C is a constellation diagram of the 32QAM reception signal in the short-distance reception mode. The maximum data rate is 24.3 Gb / s and the EVM is 8.64%. FIG. 4D is a constellation diagram of the 64QAM reception signal in the short-distance reception mode. The maximum data rate is 17.64 Gb / s and the EVM is 6.24%. The power consumption of the CMOS circuit of the receiver 20 operating in the short-distance reception mode is only 6 mW, which is 1/100 of that in the normal reception mode.

≪Automatic mode switching≫
In order for the dual-mode high-speed wireless communication system 100 according to the present embodiment to communicate correctly, the transmitter 10 and the receiver 20 need to operate in modes corresponding to each other. That is, when the transmitter 10 operates in the normal transmission mode, the receiver 20 needs to operate in the normal reception mode, and when the transmitter 20 operates in the short-distance transmission mode, the receiver 20 receives the short-distance reception. Must work in mode. The mode switching of the transmitter 10 and / or the receiver 20 can be manually performed by the user, but since this is troublesome, the mode switching can be automatically performed as follows.

FIG. 5 is a flowchart of automatic mode switching. FIG. 6 is a diagram showing one operating state of the dual mode high-speed wireless communication system 100 in automatic mode switching. In addition to the configurations shown in FIGS. 1A and 1B, the transmitter 10 is made connectable to the transmitting antenna 11 and detects the power of the pulse transmitted from the receiver 20 in order to support the automatic mode switching. The pulse power detector 16 is provided, and the processor 17 is provided to calculate the distance between transmitters and receivers according to the detected pulse power. Further, the receiver 20 is configured so that the receiving LO driver 22 can be connected to the receiving antenna 21.

Before the start of communication, the pulse power detector 16 is connected to the transmitting antenna 11 in the receiver 10, and the pulse power detector 16 and the processor 17 are put into an operable state. In the receiver 20, the receiving LO driver 22 is connected to the receiving antenna 21, and the VCO 221 is put into an operable state. The pulse 200 generated from the VCO 211 in the receiver 20 is transmitted from the receiving antenna 22 (S21). In the transmitter 10, the transmitting antenna 11 receives the pulse 200, and the pulse power detector 16 detects the pulse power (S11). The distance between transmitters and receivers is calculated from the pulse power detected by the processor 17 in the transmitter 10 (S12). For example, this distance calculation can be performed by referring to a look-up table in which the pulse power and the distance between transmitters and receivers are linked.

When the distance between the transmitters and receivers is calculated, the transmitter 10 requests the receiver 20 to receive a reception mode according to the distance (S13), and itself transitions to the transmission mode according to the distance (S14). The transmission operation is started in the transmitted transmission mode (S15). On the other hand, when the receiver 20 receives the request from the transmitter 10, it transitions to the requested reception mode (S22), and starts the reception operation in the transitioned reception mode (S23). For example, if the distance between the transmitters and receivers is greater than 10 cm, the transmitter 10 requests the receiver 20 to operate in the normal receive mode, and itself starts the operation in the normal transmit mode, and the receiver 20 starts the operation. Upon receiving a request from the transmitter 10, the operation in the normal reception mode is started. As a result, the transmitter 10 and the receiver 20 can operate in modes corresponding to each other to correctly communicate with each other.

During communication (NO in S16, NO in S24), the receiver 20 measures the power of the received RF signal (S25) and calculates the distance between the transmitter and receiver from the power (S26). For example, this distance calculation can be performed by referring to a look-up table in which the received RF signal power and the distance between transmitters and receivers are linked. Then, the receiver 20 confirms whether or not the distance between the transmitters and receivers and the currently operating reception mode are compatible, and if they are not compatible (YES in S27), the receiver 20 transmits to the transmitter 10. The mode switching is requested (S28), the receiving mode is switched by itself (S29), and the receiving operation is continued (S23). When the transmitter 10 receives a request for switching the transmission mode from the receiver 20 (YES in S17), the transmitter 10 switches to the requested transmission mode (S18), and continues the transmission operation (S15). For example, when the transmitter 10 and the receiver 20 are initially operating in the normal transmission mode and the normal reception mode, but the user who has the receiver 20 approaches the transmitter 10 and the distance between the transmitters and receivers is shortened. The receiver 20 requests the transmitter 10 to operate in the short-range transmission mode, and the receiver 20 starts the operation in the short-range reception mode, and the transmitter 10 receives the request from the receiver 20. Start operation in short-range transmission mode. As a result, the transmitter 10 and the receiver 20 can operate in the corresponding modes to correctly communicate with each other.

≪Effect≫
According to the present embodiment, the receiver 20 can be operated as a heterodyne receiver when the transmitters and receivers are separated, and as a self-heterodyne receiver when the transmitters and receivers are close to each other. As a result, as can be seen from the graph of FIG. 7, a good S / N ratio can be obtained regardless of whether the transmitter / receiver is far away or near. Further, when the receivers are close to each other, the power consumption of the receiver 20 can be significantly reduced by stopping the operation of the reception LO driver 22 of the receiver 20. The receiver 20 having such characteristics is useful for applications such as receiving a large amount of data such as high-definition image data from a nearby transmitter 10, for example, a personal digital assistant or a wireless storage device.

≪Modification example≫
The terminal circuit 26 and the LO signal switch 27 of the receiver 20 may be omitted, and the reception LO driver 22 may be simply turned off in the short-range reception mode.

In the down conversion mixer 23 of the receiver 20, the differential output of the balun 211 is connected to the gates of the four transistors M1 to M4, and the differential output and the termination circuit of the receiving LO driver 22 are connected to the source via the LO signal switch 27. 26 may be connected. In this case, the receiver 20 operates as a gate pump mixer in the short-range reception mode.

GPS (Global Positioning System) or IPS (Indoor Positioning System) may be incorporated into the transmitter 10 and / or the receiver 20 so that the position of the own unit can be grasped and the distance between transmitters and receivers can be detected.

As described above, an embodiment has been described as an example of the technique in the present invention. To that end, the accompanying drawings and detailed description are provided. Therefore, among the components described in the attached drawings and the detailed description, not only the components essential for solving the problem but also the components not essential for solving the problem in order to exemplify the above technology. Can also be included. Therefore, the fact that these non-essential components are described in the accompanying drawings or detailed description should not immediately determine that those non-essential components are essential. Further, since the above-described embodiment is for exemplifying the technique of the present invention, various changes, replacements, additions, omissions, etc. can be made within the scope of claims or the equivalent scope thereof.

100 ... dual-mode high-speed wireless communication system, 10 ... dual-mode high-speed wireless transmitter, 12 ... transmission LO driver (PLL), 16 ... pulse power detector (part of distance measuring unit), 17 ... processor (range measuring unit) Part), 20 ... dual mode high-speed wireless receiver, 211 ... balun, 22 ... reception LO driver, 23 ... double balanced mixer, 25 ... LO power switch (reception mode switch), 26 ... termination circuit, 27 ... LO signal switch

Claims (7)

A balun that converts the received single-ended RF signal into a differential RF signal,
A receive LO driver that generates a differential receive LO signal,
A double-balanced mixer connected to the balun and the receiving LO driver,
A reception mode switch for switching between a first reception mode in which both the reception LO driver and the double-balanced mixer operate and a second reception mode in which the reception LO driver stops and the double-balanced mixer operates is provided. Dual mode high speed wireless receiver. Termination circuit and
A switch that operates in conjunction with the reception mode switch, the double-balanced mixer is provided with an LO signal switch that selectively connects either the reception LO driver or the termination circuit.
The LO signal switch connects the double-balanced mixer and the receiving LO driver when the receiving mode switch selects the first receiving mode, and said when the receiving mode switch selects the second receiving mode. The dual-mode high-speed radio receiver according to claim 1, which is configured to connect the double-balanced mixer and the termination circuit. The dual-mode high-speed wireless receiver according to claim 1 or 2, wherein the reception mode switch is a switch for switching whether or not power is supplied to the reception LO driver. A transmitter that transmits a transmission RF signal up-converted by a transmission LO signal, the first transmission mode in which the transmission LO harmonic component included in the transmission RF signal is suppressed and the transmission RF signal is transmitted, and the transmission. A dual mode high-speed wireless transmitter capable of switching to a second transmission mode that transmits the transmission RF signal without suppressing the LO harmonic component, and
The dual-mode high-speed radio receiver according to any one of claims 1 to 3, which receives the transmission RF signal transmitted from the dual-mode high-speed radio transmitter.
The dual-mode high-speed wireless receiver operates in the first reception mode when the dual-mode high-speed wireless transmitter operates in the first transmission mode, and the dual-mode high-speed wireless transmitter operates in the second transmission mode. A dual-mode high-speed wireless communication system that is configured to operate in the second reception mode. The dual-mode high-speed wireless transmitter has a PLL that generates the transmission LO signal.
The PLL performs a phase lock operation when the dual-mode high-speed wireless transmitter operates in the first transmission mode, and performs a self-propelled operation when the dual-mode high-speed wireless transmitter operates in the second transmission mode. The dual-mode high-speed wireless communication system according to claim 4, which is configured in the above. A distance measuring unit for measuring the distance between the dual-mode high-speed wireless transmitter and the dual-mode high-speed wireless receiver is provided.
When the distance is larger than a predetermined value, the dual-mode high-speed radio transmitter operates in the first transmission mode and the dual-mode high-speed radio receiver operates in the first reception mode, and the distance is the predetermined value. 4. The dual according to claim 4 or 5, wherein the dual-mode high-speed radio transmitter operates in the second transmission mode and the dual-mode high-speed radio receiver operates in the second reception mode. Mode high-speed wireless communication system. The dual-mode high-speed wireless transmitter acts as a distance measuring unit between a pulse power detector that detects the power of a pulse transmitted from the dual-mode high-speed wireless receiver and a transmitter / receiver according to the detected pulse power. The dual-mode high-speed wireless communication system according to any one of claims 4 to 6, further comprising a processor for calculating.