JP6009251B2 - Millimeter wave transmission module and millimeter wave transmission device - Google Patents

Description

  The present invention relates to a millimeter wave transmission module, a millimeter wave transmission device, and a millimeter wave reception device.

  In recent years, various broadband wireless communication systems have been proposed with an increase in information communication capacity. Among them, millimeter-wave wireless communication is used particularly in the field of broadcasting and communication. Millimeter waves can sharpen the beam sharply, preventing interference between satellites arranged in orbit and on the ground, and are less affected by reflections and interference on specific areas. Radio waves can be sent reliably. In addition, the millimeter wave band shown here is a frequency band including a microwave band.

  As a conventional millimeter wave band wireless communication system, for example, Japanese Patent Application Laid-Open No. 2003-258655 discloses a wireless communication system including a wireless transmitter and a wireless receiver.

  FIG. 19 is a diagram illustrating configurations of the millimeter wave band wireless transmitter 1000 and the wireless receiver 1500 described in Patent Document 1. In FIG.

  The transmitter 1000 includes an input unit 1100, a first up-convert unit 1200, a second up-convert unit 1300, and a transmission antenna 1400.

  The first up-conversion unit 1200 is a part that converts an input modulated wave signal to an intermediate frequency, and includes a frequency mixer 1201, a filter 1202, a power combiner 1203, an amplifier 1204, a power distributor 1205, and a reference signal. A source 1206 and an attenuator 1207 are provided.

  The first IF signal IF1 is input to the first up-convert unit 1200. This signal IF1 is a modulated wave signal modulated by, for example, an orthogonal multicarrier modulation method (OFDM modulation method) or the like.

  The frequency mixer 1201 multiplies the input first IF signal IF1 and the first LO signal (FLO1) output from the reference signal source 1206.

  Next, the filter 1202 provided immediately after the frequency mixer 1201 mainly extracts only the component of the signal output from the first up-converter 1200. Here, the filter 1202 allows the upper-band signal (FRF1) to pass through the output signal of the frequency mixer 1201.

  On the other hand, the power distributor 1205 distributes a part of the signal (FLO1) output from the reference signal source 1206. The attenuator 1207 adjusts the level of the distributed signal. The signal (FLO1) output from the attenuator 1207 is combined with the signal (FRF1) by the power combiner 1203.

  As a result, an intermediate frequency multiplexed signal of the signal (FRF1) converted from the modulated wave signal input to the transmitter to the intermediate frequency signal and the signal (FLO1) serving as the reference signal is generated. The intermediate frequency multiplex signal is amplified by the amplifier 1204, and the amplified intermediate frequency multiplex signal is input to the second up-conversion unit 1300 as the second IF signal IF2 (FLO1 + FRF1).

  The second upconverter 1300 is a part that converts the frequency of the input signal IF2 into the millimeter wave band, and includes a mixer 1301, a filter 1302, an amplifier 1303, and a local oscillator 1304.

  When the signal IF2 output from the first upconverter 1200 is input to the second upconverter 1300, the mixer 1301 has an intermediate frequency including the signal (FRF1) and the signal (FLO1). The multi-wave signal (that is, IF2) and the second LO signal (FLO2) output from the local oscillator 1304 are multiplied to perform up-conversion to the millimeter wave band.

  Next, a filter 1302 provided immediately after the mixer 1301 allows a radio multiplexed signal having only a desired frequency to pass through the up-converted radio multiplexed signal. Thereby, a radio multi-wave signal including the radio modulation signal component (FRF1 + FLO2) and the radio reference signal component (FLO1 + FLO2) is generated. This radio multiwave signal is amplified by amplifier 1303, and the amplified radio multiwave signal is output to transmission antenna 1400.

  Then, a radio multi-wave signal 2000 composed of a radio reference signal component (FLO1 + FLO2) and a radio modulation signal component (FRF1 + FLO2) is transmitted from the transmission antenna 1400, that is, the transmitter 1000.

  Next, the receiver 1500 that receives a signal transmitted from the transmitter 1000 will be described.

  The receiver 1500 includes a receiving antenna 1600, a first down-converting unit 1700, and a second down-converting unit 1800. The receiver 1500 receives the signal transmitted from the transmitter 1000, and down-converts the received signal to the original modulated wave signal (IF1).

  The receiving antenna 1600 receives the radio multi-wave signal 2000 composed of the reference signal component (FLO1 + FLO2) and the radio modulation signal component (FRF1 + FLO2) transmitted from the transmitting antenna 1400 of the transmitter 1000.

  The first down-conversion unit 1700 is a part that converts an input radio multi-wave signal into an intermediate frequency signal, and includes a filter 1701, an amplifier 1702, a mixer 1703, an amplifier 1704, and a local oscillator 1705. .

  A filter 1701 passes the required signal. The amplifier 1702 amplifies the passed signal. Next, the mixer 1703 performs a first frequency conversion on the signal (FLO2) from the local oscillator 1705. That is, the reference signal component (FLO1 + FLO2) and the radio modulation signal component (FRF1 + FLO2) are down-converted to the second IF signal IF2 (that is, FLO1, FRF1) that is an intermediate frequency multiplexed wave signal.

  Thus, the second IF signal IF2 (FLO1, FRF1) is generated. The second IF signal is amplified by the amplifier 1704, and the amplified signal IF2 is output to the second down-conversion unit 1800.

  The second down-converter 1800 is a part that converts the frequency of the second IF signal IF2 that is input into the first IF signal IF1, and includes a distributor 1801, a filter 1802, a filter 1803, a mixer 1804, and an amplifier 1805. , And an output unit 1806.

  When the second IF signal IF2 is input to the second downconverter 1800, the signal is distributed by the distributor 1801. One of the distributed signals is input to the mixer 1804 via a filter 1802 through which only the signal (FRF1) can pass. The other signal is amplified by an amplifier 1805 via a filter 1803 through which only the signal (FLO1) can pass, and then input to the mixer 1804.

The mixer 1804 multiplies the signal (FRF1) and the signal (FLO1). As a result, the signal (FRF1) is down-converted. That is, the first IF signal IF1 is demodulated.

  As described above, the receiver 1500 demodulates the first IF signal IF1. The first IF signal IF1 is the same as the first IF signal IF1 input to the transmitter 1000.

JP 2003-258655 A

  However, the transmitter 1000 described in Patent Document 1 has the following problems.

  When the signal IF2 output from the first up-convert unit 1200 is input to the mixer 1301, the mixer 1301 converts the intermediate frequency multiplexed signal including the signal (FRF1) and the signal (FLO1) into the local oscillator 1304. Is up-converted to the radio frequency band using the second LO signal (FLO2) output from.

  The signal FLO1 is a continuous sinusoidal wave (CW wave) and needs to be a signal having a power level equal to or higher than that of the signal FRF1. That is, since the signal FLO1 has a narrower bandwidth and a specific frequency than the modulated signal wave FRF1, the peak power becomes an extremely large signal.

  As a result, the output of the frequency mixer 1301 is saturated and distorted by the signal FLO1, and the signal FRF1, which is the signal component that should be transmitted originally, cannot be appropriately up-converted, so that a sufficient transmission distance cannot be secured. there were.

  Therefore, an object of the present invention is to receive a signal transmitted from a millimeter-wave transmission module, a millimeter-wave transmission device, and such a millimeter-wave transmission device that can appropriately upconvert components of a signal to be transmitted. It is to provide a millimeter wave receiver.

  In order to solve the above problems, a millimeter wave transmission module of the present invention includes a multiplier that generates a multiplied reference signal obtained by multiplying a reference signal, and an intermediate frequency signal that is frequency-converted by the reference signal based on the multiplied reference signal. A millimeter-wave band first mixer that up-converts to the millimeter-wave band, a millimeter-wave band second mixer that up-converts the reference signal to the millimeter-wave band based on the multiplied reference signal, a millimeter-wave band first mixer, and a millimeter-wave band And a millimeter-wave band synthesizer that synthesizes the signals up-converted by the second mixer to generate a millimeter-wave multiplexed signal.

  Preferably, a millimeter wave band pass filter for removing the lower sideband of the millimeter wave multiplexed signal as an image signal is provided.

  Preferably, the millimeter wave band first mixer and the millimeter wave band second mixer are second-order even harmonic mixers.

  The millimeter wave transmitter of the present invention includes a reference signal source that outputs a reference signal, an IF band mixer that upconverts a baseband signal to an intermediate frequency signal based on the reference signal, and a reference signal that is output from the reference signal source From a reference signal source based on the multiplied reference signal, a multiplier that generates a multiplied reference signal multiplied by the frequency, a first mixer in the millimeter wave band that upconverts the intermediate frequency signal to the millimeter wave band based on the multiplied reference signal, Millimeter-wave multiplexed signal by combining the up-converted signal in the millimeter-wave band first mixer and the millimeter-wave band first mixer and the millimeter-wave band second mixer to up-convert the output reference signal to the millimeter-wave band And a millimeter-wave band synthesizer for generating

  Preferably, a millimeter wave band pass filter for removing the lower sideband of the millimeter wave multiplexed signal as an image signal is provided.

  Preferably, the millimeter wave band first mixer and the millimeter wave band second mixer are second-order even harmonic mixers.

  Preferably, an amplification distribution unit is provided that amplifies the reference signal output from the reference signal source, and distributes the reference signal to an IF band mixer, a multiplier, and a millimeter wave band second mixer.

  Preferably, an IF band pass filter that passes the lower sideband of the intermediate frequency signal output from the IF band mixer is provided.

  A millimeter-wave transmitter of the present invention includes a reference signal source that outputs a reference signal, an IF band first mixer that up-converts a first baseband signal into a first intermediate frequency signal based on the reference signal, a reference An IF band second mixer that up-converts the second baseband signal into a second intermediate frequency signal based on the signal; and an IF band combiner that combines the first intermediate frequency signal and the second intermediate frequency signal. A multiplier that generates a multiplied reference signal obtained by multiplying the reference signal output from the reference signal source, and a first millimeter-wave band mixer that upconverts the synthesized intermediate frequency signal to the millimeter-wave band based on the multiplied reference signal And a millimeter-wave band second mixer for up-converting the reference signal output from the reference signal source to the millimeter-wave band based on the multiplied reference signal, the millimeter-wave band first mixer, and the millimeter-wave band second mixer Up service converter - by combining the bets signal and a millimeter wave band synthesizing unit for generating a millimeter wave multiplex signal.

  Preferably, a millimeter wave band pass filter for removing the lower sideband of the millimeter wave multiplexed signal as an image signal is provided.

  Preferably, the millimeter wave band first mixer and the millimeter wave band second mixer are second-order even harmonic mixers.

  Preferably, the reference signal output from the reference signal source is amplified, divided into four parts, and supplied to the IF band first mixer, the multiplier, the millimeter wave band second mixer, and the IF band second mixer. With multiple amplifiers.

  Preferably, the IF band first bandpass filter that passes the lower sideband of the first intermediate frequency signal output from the IF band first mixer, and the second intermediate frequency signal output from the IF band second mixer An IF band second bandpass filter that passes the lower sideband.

  A millimeter-wave receiver of the present invention includes a millimeter-wave band mixer that down-converts a millimeter-wave multiplexed signal to generate an intermediate-frequency multiplexed signal, a first filter that outputs a first intermediate-frequency signal from the intermediate-frequency multiplexed signal, A second filter that outputs a second intermediate frequency signal from the intermediate frequency multiplex signal, a third filter that outputs a reference signal from the intermediate frequency multiplex signal, and a first intermediate frequency signal based on the reference signal An IF band first mixer that downconverts to generate a first baseband signal, and an IF band that downconverts the second intermediate frequency signal to generate a second baseband signal based on the reference signal A second mixer.

  According to the present invention, components of a signal to be transmitted can be appropriately up-converted.

It is a figure which shows the structure of the millimeter wave transmission apparatus of 1st Embodiment. It is a figure showing the frequency spectrum of 1st modulation signal bb1. It is a figure which shows the frequency spectrum of the reference signal std. It is a figure showing the frequency spectrum of 1st IF signal IF1. It is a figure which shows the frequency spectrum of a millimeter wave transmission signal. It is a figure which shows the structure of the millimeter wave transmission apparatus of 2nd Embodiment. It is a figure which shows the frequency spectrum of 2nd modulation signal bb2. It is a figure showing the frequency spectrum of a frequency multiplexing signal. It is a figure which shows the frequency spectrum of a millimeter wave transmission signal. It is a figure showing the structure of the millimeter wave receiver of 2nd Embodiment. It is a figure showing the frequency spectrum of the millimeter wave multiplexed signal input into the millimeter wave receiving antenna. It is a figure showing the frequency spectrum of IF band multiple signal. FIG. 5 is a diagram illustrating characteristics of an IF band bandpass filter 56, an IF band bandpass filter 54, and an IF band bandpass filter 55. It is a figure for demonstrating extraction of the reference signal IFstd. It is a figure for demonstrating extraction of 1st IF signal IF1. It is a figure for demonstrating extraction of 2nd IF signal IF2. It is a figure which shows the frequency spectrum of 1st baseband signal bb1. It is a figure which shows the frequency spectrum of 2nd baseband signal bb2. 2 is a diagram illustrating configurations of a millimeter wave band wireless transmitter 1000 and a wireless receiver 1500 described in Patent Literature 1. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a diagram illustrating a configuration of the millimeter wave transmission device according to the first embodiment.

  With reference to FIG. 1, the millimeter wave transmitter 1 includes an input terminal 5, a baseband circuit 2, an IF circuit 3, and a millimeter wave IC module 4.

A first modulation signal bb1 is input from the input terminal 5.
FIG. 2 is a diagram representing the frequency spectrum of first modulated signal bb1.

  As shown in FIG. 2, the frequency fbb1 of the first modulated signal bb1 is 400 MHz to 800 MHz and 1000 MHz to 2100 MHz. The first modulation signal bb1 is a broadcast wave signal, and corresponds to a signal obtained by combining a UHF band terrestrial digital broadcast signal and a BS / CS 110 degree broadcast IF signal. Hereinafter, the first modulation signal bb1 may be referred to as a baseband signal.

  If the IF band frequency bandpass filter having a wide bandwidth and high steep performance is used in a millimeter wave transmission device and a millimeter wave reception device described below, the first modulation signal bb1 is, for example, a band of 200 MHz to 2500 MHz. This signal may be used.

  The baseband signal bb1 is preferably a wideband signal with little fluctuation in the power level of the digital modulation signal. The baseband signal bb1 is impedance-converted by a 75 / 50Ω conversion unit 191, amplified by an amplifier 6 in the baseband circuit 2, further level-limited by a limiter 7, and input to an IF band mixer 8 in the IF circuit 3. Is done.

  In FIG. 1, the reference signal std output from the reference signal source 15 and having a frequency fstd of 5.5737 GHz is amplified to an appropriate level by the amplification distributor 14 and then divided into three. The first is sent to the IF band mixer 8 as a local oscillation signal. Second, the level is adjusted by the attenuator (T1) 17 and then input from the terminal 13B of the millimeter wave IC module 4 to the millimeter wave band mixer 32b in the millimeter wave IC module 4. The third is sent to the M-multiplier (M is a natural number of 2 or more, M = 5 in the present embodiment) 36 in the millimeter wave IC module 4 via the matching unit 16.

FIG. 3 is a diagram illustrating a frequency spectrum of the reference signal std.
The reference signal std is a CW (continuous wave) signal having a frequency fstd of 5.573 GHz.

  The IF band mixer 8 up-converts the baseband signal bb1 to the IF band by the reference signal std (local oscillation signal). The IF bandpass filter (BPF) 9 passes only the lower sideband out of the upconverted signal and outputs the first IF signal IF1. The first IF signal IF1 is amplified by the IF amplifier 10 and further appropriately level-adjusted by the attenuator (T2) 11 and the IF amplifier 12, and then is input from the input terminal 13A of the millimeter wave IC module 4 to the millimeter wave IC. It is sent to the millimeter wave band mixer 32a in the module 4.

FIG. 4 is a diagram illustrating the frequency spectrum of the first IF signal IF1.
In the present embodiment, the frequency fIF1 of the first IF signal IF1 is a lower sideband signal wave of 3.473 GHz to 4.573 GHz, 4.773 GHz to 5.173 GHz. That is, since the IF band-pass filter 9a selects the lower band signal, the frequency fIF1 of the first IF signal IF1 is expressed by the following relationship.

fstd−fbb1 = fIF1 (1)
An M-multiplier (M is a natural number greater than or equal to 2 and M = 5 in the present embodiment) 36 multiplies the reference signal std by 5 and outputs a multiplied reference signal std_5. The multiplied reference signal std_5 multiplied by 5 is divided into two, amplified by the amplifiers 37a and 37b, and sent to the millimeter wave band mixer 32a and the millimeter wave band mixer 32b as local oscillation signals.

  The millimeter wave band mixer 32a is a second-order even harmonic mixer, and further multiplies the input multiplied reference signal std_5 multiplied by 5 to generate a multiplied reference signal std_10. Therefore, the original reference signal std is multiplied by 10 by the total. The frequency RFLO of the multiplied reference signal std_10 is 55.73 GHz (10 × 5.573 GHz). The millimeter wave band mixer 32a up-converts the first IF signal IF1 input from the input terminal 13A to the millimeter wave band by the reference signal std_10, and outputs the first millimeter wave modulation signal RF1. The frequency of the first millimeter wave modulation signal RF1 is assumed to be fRF1.

  The millimeter wave band mixer 32b is a second-order even harmonic mixer, and further multiplies the input multiplied reference signal std_5 multiplied by 5 to generate a multiplied reference signal std_10. Therefore, the original reference signal std is multiplied by 10 by the total. The frequency RFLO of the multiplied reference signal std_10 is 55.73 GHz (= 10 × 5.573 GHz). The millimeter wave band mixer 32b up-converts the reference signal std input from the input terminal 13B to the millimeter wave band using the multiplied reference signal std_10, and outputs a millimeter wave reference signal RFstd. The frequency of the millimeter wave reference signal RFstd is assumed to be fRFstd.

  The millimeter wave band power combiner 29 combines the signal up-converted by the millimeter wave band mixer 32a and the signal up-converted by the millimeter wave band mixer 32b, and outputs a millimeter wave band multiplexed signal.

  The millimeter wave band-pass filter 33 passes the upper side band of the millimeter wave multiplexed signal and removes the lower side band as an image signal. The upper sideband signal is amplified by the amplifier 34 and then radiated as a millimeter wave transmission signal by the antenna 35 integrated with the millimeter wave IC module 4.

FIG. 5 is a diagram illustrating a frequency spectrum of a millimeter wave transmission signal.
The millimeter wave transmission signal includes a millimeter wave reference signal RFstd and a first millimeter wave modulation signal RF1, and has the following relationship.

<Regarding First Millimeter-Wave Modulation Signal RF1>
fIF1 + 10 × fstd = fRF1 (2)
Equation (2) is transformed as follows by Equation (1).

11 × fdtd−fbb1 = fRF1 (3)
<About the millimeter wave reference signal RFstd>
fstd + 10 × fstd = 11 × fstd = fRFstd (4)
As described above, the frequency relationship between the millimeter wave reference signal RFstd and the first millimeter wave modulation signal RF1 in the millimeter wave transmitter 1 is determined only by the frequency of the reference signal std. For this reason, the frequency adjustment of the millimeter wave transmitter 1 can be made extremely easy by adjusting the frequency fstd of the reference signal std.

  In the above configuration, the first IF signal IF1 is input to the millimeter wave band mixer 32a in the millimeter wave IC module 4 and the reference signal std is input to the millimeter wave band mixer 32b independently. Since the first IF signal 1F1 can be input to the millimeter wave band mixer 32a up to the saturation region, there is an advantage that distortion of the first IF signal does not occur.

  Conventionally, the peak signal of the reference signal is extremely larger than the first IF signal, and the input millimeter wave band mixer is easily distorted, and the modulation signal cannot be input to a sufficient level. In particular, when the input modulation signal is a digital modulation signal, the temporal power level fluctuation is small in a wide band, while the reference signal of the CW signal is a narrow band signal at one frequency and has a large level and a high peak level. In this way, the reference signal and the input modulation signal are in contrast, and when the reference signal and the input modulation signal are to be up-converted together by the same single mixer as in the prior art, the peak of the reference signal is obtained. The time signal is about 10 dB or more larger than the IF signal, and the input millimeter wave band mixer is easily distorted, and the modulation signal to be originally transmitted cannot be up-converted to a sufficient level. Sufficient output could not be secured in the millimeter wave band.

  In the present embodiment, the millimeter-wave band mixer 32a and the millimeter-wave band mixer 32b independently perform frequency up-conversion, so that distortion is unlikely to occur and the millimeter-wave modulation signal RF1 to be originally transmitted is sufficiently transmitted. Can be strengthened. As a result, the transmission distance is increased by more than twice, distortion is reduced, and good reception CN characteristics (carrier-to-noise characteristics) can be obtained.

  In this embodiment, the outputs of the millimeter wave band mixer 32a and the millimeter wave band mixer 32b are combined by the millimeter wave band power combiner 29, but immediately after the millimeter wave band mixer 32a and the millimeter wave band mixer 32b. Alternatively, a configuration may be employed in which an amplifier is provided or a frequency filter or the like is provided, and then the millimeter wave band power combiner 29 performs synthesis. In consideration of the chip size of the IC, various configurations are possible for the configuration after the millimeter wave band mixer 32a and the millimeter wave band mixer 32b.

(Second Embodiment)
In the following, only the differences from the first embodiment will be mainly described. In the first embodiment, only the first modulation signal bb1 is used as the input signal. However, in the second embodiment, since the second modulation signal bb2 is added as the input signal, the first embodiment is used. The second modulation signal system is added to the second embodiment, and the configuration of the first embodiment is used as it is in the second embodiment.

FIG. 6 is a diagram illustrating a configuration of the millimeter wave transmission device according to the second embodiment.
The millimeter wave transmission device 193 of the present embodiment includes a first input terminal 5a, a second input terminal 5b, a reference signal source 15, a first baseband circuit 2a, and a second baseband circuit 2b. A first IF circuit 38a, a second IF circuit 38b, and a millimeter wave IC module 4.

  In the present embodiment, not only the first modulated signal bb1 but also the second modulated signal bb2, which is a baseband signal, is input to the millimeter wave transmitter 192 from the second input terminal 5B. The second modulated signal bb2 is impedance-converted by the 75 / 50Ω converter 193 of the second baseband circuit 2b, amplified by the amplifier 96, further level-limited by the limiter 97, and the IF of the second IF circuit 38b. It is sent to the band mixer 8b.

  The configuration of the first baseband circuit 2a to which the first modulation signal bb1 is input is the same as the configuration of the baseband circuit 2 in FIG.

FIG. 7 is a diagram illustrating a frequency spectrum of the second modulation signal bb2.
As shown in FIG. 7, the frequency bb2 of the second modulation signal is 900 MHZ to 2000 MHz.

  The frequency fbb2 of the second modulation signal bb2 may overlap with the frequency band of the frequency fbb1 of the first modulation signal bb1. Further, although the frequency fbb2 of the second modulation signal bb2 is set to 900 MHz to 2000 MHz, if a wide band and high steep performance is used as a frequency band pass filter of the IF band, It may be 200 MHz to 2500 MHz. The first modulation signal bb1 and the second modulation signal bb2 are desirably wideband signals with little fluctuation in the power level of the digital modulation signal.

  The frequency fstd of the reference signal std output from the reference signal source 15 is 5.573 GHz. The reference signal std is sent to the amplification / distribution unit 14a of the first IF circuit 38a and the amplifier 14b in the second IF circuit 38b.

  The amplification / distribution unit 14a is the same as the amplification / distribution unit 14 of FIG. 1, and amplifies the reference signal std to an appropriate level and distributes it to three. The first is sent as a local oscillation signal to the IF band mixer 8a. Second, the level is adjusted by the attenuator (T1) 17 and then input from the terminal 13B of the millimeter wave IC module 4 to the millimeter wave band mixer 32b in the millimeter wave IC module 4. The third is sent to the M-multiplier (M is a natural number of 2 or more, M = 5 in the present embodiment) 36 in the millimeter wave IC module 4 via the matching unit 16.

  The amplifier 14b amplifies the reference signal std to an appropriate level and sends it to the IF band mixer 8b as a local oscillation signal.

  The IF band mixer 8b up-converts the input second modulation signal bb2 to the second IF band by the input reference signal std (local oscillation signal).

  The IF band-pass filter (BPF) 9b passes only the upper side band of the upconverted signal and outputs the second IF signal IF2. The second IF signal IF2 is amplified by the IF amplifier 10b, subjected to an appropriate level adjustment by the attenuator (T3) 11b and the IF amplifier 12b, and then sent to the IF band power combiner 39.

  The IF band power combiner 39 combines the first IF signal IF1 and the second IF signal IF2 and outputs an IF multiband overlap signal.

FIG. 8 is a diagram showing the frequency spectrum of the IF band multiplexed signal.
The IF band multiplexed signal is sent to the millimeter wave band mixer 32a through the input terminal 13A of the millimeter wave IC module 4.

  In the present embodiment, the frequency fIF2 of the second IF signal IF2 is a signal in the upper sideband signal wave of 6.473 GHz to 7.573 GHz.

That is, the frequency fIF2 of the second IF signal IF2 is expressed by the following relationship.
fstd + fbb2 = fIF2 (5)
An M-multiplier (M is a natural number greater than or equal to 2 and M = 5 in the present embodiment) 36 multiplies the reference signal std by 5 and outputs a multiplied reference signal std_5. The multiplied reference signal std_5 multiplied by 5 is divided into two, amplified by the amplifiers 37a and 37b, and sent to the millimeter wave band mixer 32a and the millimeter wave band mixer 32b as local oscillation signals.

  The millimeter wave band mixer 32a is a second-order even harmonic mixer, and further multiplies the inputted five-fold reference signal std_5 to generate a multiplied reference signal std_10. Therefore, the original reference signal std is multiplied by 10 by the total. The frequency RFLO of the multiplied reference signal std_10 is 55.73 GHz (10 × 5.573 GHz). The millimeter-wave band mixer 32a up-converts the IF multiplexed signal input from the input terminal 13A into a millimeter-wave band using the multiplied reference signal std_10, and generates a first millimeter-wave modulation signal RF1 and a second millimeter-wave modulation signal RF2. Outputs multiple signals. The frequency of the second millimeter wave modulation signal RF2 is assumed to be fRF2.

  The millimeter wave band mixer 32b is a second-order even harmonic mixer, and further multiplies the input multiplied reference signal std_5 multiplied by 5 to generate a multiplied reference signal std_10. Therefore, the original reference signal std is multiplied by 10 by the total. The frequency RFLO of the multiplied reference signal std_10 is 55.73 GHz (10 × 5.573 GHz). The millimeter wave band mixer 32b up-converts the reference signal std input from the input terminal 13B to the millimeter wave band using the multiplied reference signal std_10, and outputs a millimeter wave reference signal RFstd. The frequency of the millimeter wave reference signal RFstd is assumed to be fRFstd.

  The millimeter wave band power combiner 29 combines the signal up-converted by the millimeter wave band mixer 32a and the signal up-converted by the millimeter wave band mixer 32b, and outputs a millimeter wave band multiplexed signal.

  The millimeter wave multiplexed signal is passed through the upper side band by the millimeter wave band pass filter 33, and the lower side band is removed as an image signal. The upper sideband signal is amplified by an amplifier 34 and radiated as a transmission signal by an antenna 35 integrated with the millimeter wave IC module 4.

FIG. 9 is a diagram illustrating a frequency spectrum of a millimeter wave transmission signal.
The millimeter wave transmission signal includes a millimeter wave reference signal RFstd, a first millimeter wave modulation signal RF1, and a second millimeter wave edited signal RF2, and has the following relationship.
<Regarding First Millimeter-Wave Modulation Signal RF1>
fIF1 + 10 × fstd = fRF1 (6)
Equation (6) is transformed as follows by Equation (1).

11 × fstd−fbb1 = fRF1 (7)
<Regarding Second Millimeter-Wave Modulation Signal RF2>
fIF2 + 10 × fstd = fRF2 (8)
Equation (8) is transformed as follows by Equation (5).

11 × fstd + fbb2 = fRF2 (9)
<About the millimeter wave reference signal RFstd>
fstd + 10 × fstd = 11 × fstd = fRFstd (10)
As described above, the millimeter wave reference signal RFstd in the millimeter wave transmitter 192 has a frequency relationship between the first millimeter wave modulation signal RF1 and the second millimeter wave modulation signal RF2 determined only by the frequency fstd of the reference signal std. . For this reason, the frequency adjustment of the millimeter wave transmission device 192 has only to be performed by adjusting the frequency fstd of the reference signal std, which is remarkably easy.

  In the above configuration, the millimeter wave band mixer 32a in the millimeter wave IC module has the first IF signal IF1 and the second IF signal IF2, and the millimeter wave band mixer 32b has the reference signal std. Are input independently. Therefore, the millimeter wave band mixer 32a can input a signal up to the saturation region, and the reference signal std is input only to the millimeter wave band mixer 32b. Therefore, the first IF signal IF1 and the second IF signal are input. IF2 distortion does not occur. In addition, since only the IF modulation signal is input to the millimeter-wave band mixer 32a, the second modulation signal bb2 also has good reception CN characteristics with little distortion even when the frequency band is increased to about twice. Transmission distance is expanded. That is, until now, the peak signal of the reference signal is extremely larger than the first and second IF signals, and the input millimeter-wave mixer is easily distorted, and the modulation signal can be input to a sufficient level. could not.

  In the present embodiment, the frequency up-conversion is independently performed by the millimeter-wave band mixer 32a and the millimeter-wave band mixer 32b, so that distortion hardly occurs and the millimeter-wave modulation signals RF1 and RF2 to be originally transmitted are sufficient. Can be increased up to the transmission power. As a result, the transmission distance is expanded more than twice, distortion is reduced, and not only good reception CN characteristics (carrier-to-noise characteristics) can be obtained, but also widening in the millimeter wave band becomes possible. The width can be expanded, and the transmission capacity and transmission speed can be increased.

  In particular, when the first and second input modulation signals are digital modulation signals, the power level fluctuation is small in a wide band, while the reference signal of the CW signal is a narrow band signal at one frequency and has a high level and a peak level. large. In this manner, the reference signal and the two input modulation signals are in contrast, and when the reference signal and the two input modulation signals are tried to be up-converted together by the same single mixer as in the prior art, the reference signal The peak signal is larger by about 10 dB than the first and second IF signals, the input millimeter-wave mixer is easily distorted, and the modulation signal to be originally transmitted is up-converted to a sufficient level. I could not.

  In this embodiment, these signals can be up-converted independently by the millimeter-wave band mixer 32a and the millimeter-wave band mixer 32b when up-converting the radio frequency band to the millimeter-wave band. The signal can be up-converted to a good millimeter wave band with little distortion.

(Receiver)
Next, a millimeter wave receiver that receives a signal from the millimeter wave transmitter 193 of the present embodiment will be described.

FIG. 10 is a diagram illustrating the configuration of the millimeter wave receiver according to the second embodiment.
In this embodiment, the N multiplier + buffer amplifier 45 is described as N = 3.

  Referring to FIG. 10, this millimeter wave receiving apparatus 40 includes a millimeter wave receiving antenna 51, a DRO type oscillator 48, an amplifier 47, a matching unit 46, a millimeter wave IC module 41, an IF circuit 42, and a base. And a band circuit 43.

  The multiplexed video signal demodulated by the baseband circuit 43 is connected to an electronic device such as a TV 92 or a recorder 93 via a coaxial cable. A control signal 94 for switching channels is output from the TV 92 and the recorder 93.

  The millimeter wave multiplexed signal input from the millimeter wave receiving antenna 51 is amplified by the millimeter wave amplifier 50 of the millimeter wave IC module 41, unnecessary waves are suppressed by the millimeter wave bandpass filter 49, and the millimeter wave band mixer 44 (first wave Frequency down converter).

  FIG. 11 is a diagram showing a frequency spectrum of a millimeter wave multiplexed signal input to the millimeter wave receiving antenna 51.

  The millimeter wave multiplexed signal is a signal obtained by synthesizing a first millimeter wave modulation signal RF1 having a frequency of fRF1, a second millimeter wave modulation signal RF2 having a frequency of fRF2, and a millimeter wave reference signal RFstd having a frequency of fRFstd. is there.

  The DRO type oscillator 48 generates a local oscillation signal having a frequency of frlo (= 9.266 GHz), and is sent to the N multiplier + buffer amplifier 45 via the amplifier 47 and the matching unit 46.

  The N multiplier + buffer amplifier 45 multiplies the frequency of the input local oscillation signal by 3 to generate a 27.798 GHz signal, further amplifies this signal, and outputs it to the millimeter wave band mixer 44.

  The millimeter wave band mixer 44 uses a second harmonic mixer (for example, an even harmonic mixer using an anti-parallel diode pair), and further multiplies the input signal multiplied by 3 to 55.596 GHz. Generate a signal. The millimeter wave band mixer 44 uses the 55.596 GHz signal to frequency down-convert the millimeter wave multiplexed signal output from the millimeter wave band pass filter 49 (first frequency down-conversion), and then the IF band multiplexed signal. Is generated.

FIG. 12 is a diagram showing the frequency spectrum of the IF band multiplexed signal.
The IF band multiplexed signal is a signal obtained by combining a first IF signal IF1 having a frequency of fIF1, a second IF signal IF2 having a frequency of fIF2, and a reference signal IFstd having a frequency of fIFstd.

  The IF multiplexed signal is amplified by the IF amplifier 52, divided into three by the three distributor 53, and sent to the IF band band-pass filter 56, IF band band-pass filter 54, and IF band band-pass filter 55.

  FIG. 13 is a diagram illustrating characteristics of IF band-pass filter 56, IF band-pass filter 54, and IF band-pass filter 55.

  The IF band-pass filter 56 extracts the reference signal IFstd from the IF multiplexed signal. As shown in FIGS. 13 and 14, the reference signal IFstd is extracted by the IF band-pass filter 56 having a pass characteristic of the filter characteristic 150. The extracted reference signal IFstd is divided into two by the two distributor 65, sent to the amplifier 61 and the amplifier 62, amplified, and sent to the IF band mixer 63 and the IF band mixer 64 as a local oscillation signal. .

  The IF band-pass filter 54 extracts the first IF signal IF1 from the IF multiplexed signal. As shown in FIGS. 13 and 15, the first IF signal IF <b> 1 is extracted by the IF band-pass filter 54 having a pass characteristic of the filter characteristic 151. The first IF signal IF1 is amplified by an IF amplifier 57, further subjected to level adjustment by an attenuator (T4) 59, and sent to an IF band mixer 63.

  The IF band-pass filter 55 extracts the second IF signal IF2 from the IF multiplexed signal. As shown in FIGS. 13 and 16, the second IF signal IF <b> 2 is extracted by the IF band-pass filter 55 having the pass characteristic of the filter characteristic 152. The second IF signal IF2 is amplified by an IF amplifier 58, further subjected to level adjustment by an attenuator (T5) 60, and sent to an IF band mixer 64.

  The IF band mixer 63 down-converts the first IF signal IF1 with the reference signal IFstd by the second frequency to generate the first baseband signal bb1 having the frequency fbb1.

  The IF band mixer 64 down-converts the second IF signal IF2 with the reference signal IFstd for a third frequency to generate a second baseband signal bb2 having the frequency fbb2.

  FIG. 17 is a diagram illustrating a frequency spectrum of the first baseband signal bb1. The first baseband signal bb1 is a signal having the same frequency, frequency stability, and phase noise characteristics as the first modulation signal bb1 shown in FIG.

  FIG. 18 is a diagram illustrating a frequency spectrum of the second baseband signal bb2. The second baseband signal bb2 is a signal having the same frequency, frequency stability, and phase noise characteristics as the second modulated signal bb2 shown in FIG.

In the above processing, the frequency relationship is expressed as follows.
<First down-conversion of first millimeter-wave modulation signal RF1>
fRF1-6 × frlo = fIF1 (11)
Equation (11) can be transformed as follows by Equation (7).
(11 × fstd−fbb1) −6 × frlo = fIF1 (12)
<First down-conversion of second millimeter-wave modulation signal RF2>
fRF2-6 × frlo = fIF2 (13)
Equation (13) can be transformed as follows by Equation (9).
(11 × fstd + fbb2) −6 × frlo = fIF2 (14)
<First down-conversion of millimeter wave reference signal RFstd>
fRFstd−6 × frlo = fIFstd (15)
Equation (15) can be transformed as follows by Equation (10).

11 × fstd−6 × frlo = fIFstd (16)
<Second down-conversion of the first IF signal IF1>
The second down-conversion is expressed as follows by the relationship of fIFstd> fIF1.

fIFstd−fIF1 = fbb1 (17)
<Third down-conversion of second IF signal IF2>
The third down-conversion is expressed as follows by the relationship of fIFstd <fIF2.

fIF2-fIFstd = fbb2 (18)
As is clear from this relationship, the first baseband signal bb1 and the second baseband signal bb2 output from the millimeter wave receiving device 40 are bb1, first input signal of the millimeter wave transmitting device 193, and the second baseband signal bb2. Bb2 which is an input signal of 2, and a signal having the same frequency, frequency stability and phase noise characteristics as the transmission input signal is generated.

  In the millimeter wave receiving apparatus 40 shown in FIG. 10, the baseband circuit 43 generates the generated first baseband signal bb1 and second baseband signal bb2 as an attenuator 73, an attenuator 70, and a filter, respectively. 74 and 71 and the amplifiers 75 and 72 are subjected to level adjustment and unnecessary wave signal removal, and then input to the switch 76. The TV 92 and the recorder 93 are selected and output by the switch SW76 in the receiving device 40 in accordance with a control signal 94 for switching channels.

  In the above-described millimeter wave receiving apparatus 40, the receiving apparatus that receives the signal of the millimeter wave transmitting apparatus 192 of the second embodiment has been described. However, the receiving apparatus that receives the signal of the millimeter wave transmitting apparatus 1 of the first embodiment. Can be used as is. Furthermore, by appropriately changing the pass characteristics of the IF band-pass filters 54, 55, and 56 of the IF circuit 42, it is possible to provide a receiving apparatus dedicated to the first embodiment with higher receiving sensitivity.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1,192 mm-wave transmitter, 2, 2a, 2b, 43 baseband circuit, 3, 38a, 38b, 42 IF circuit, 4, 41 mm-wave IC module, 6, 10, 10a, 10b, 12, 12a, 12b , 14b, 96, 37a, 37b, 34, 50, 52, 57, 58, 61, 62, 75 Amplifier, 7, 97 Limiter, 8, 8a, 8b, 32a, 32b, 44, 63, 64 Mixer, 9a, 9b, 33, 49, 54, 55, 56, 71, 74 Band-pass filter, 13A, 13B, 13C terminals, 14, 14a Amplifying distributor, 15 Reference signal source, 16, 46 Matching unit, 11, 11a, 11b, 17, 17a, 70, 73 Attenuator, 29, 39 Power combiner, 35, 51 Antenna, 36 M multiplier, 40 Millimeter wave receiver, 45 Multiplier + buffer amplifier, 48 DRO oscillator, 76 switch, 191, 193 75/50 [Omega conversion unit.

Claims (13)

A multiplier for generating a multiplied reference signal obtained by multiplying the reference signal;
A first millimeter-wave band mixer that up-converts an intermediate frequency signal frequency-converted by the reference signal into a millimeter-wave band based on the multiplied reference signal;
A second millimeter-wave band mixer that up-converts the reference signal into a millimeter-wave band based on the multiplied reference signal;
A millimeter-wave transmission module comprising a millimeter-wave band synthesizer that synthesizes signals up-converted by the millimeter-wave band first mixer and the millimeter-wave band second mixer to generate a millimeter-wave multiplexed signal.    The millimeter wave transmission module according to claim 1, further comprising a millimeter wave bandpass filter that removes a lower sideband of the millimeter wave multiplexed signal as an image signal.    The millimeter wave transmission module according to claim 1, wherein the millimeter wave band first mixer and the millimeter wave band second mixer are second-order even harmonic mixers. A reference signal source for outputting a reference signal;
An IF band mixer that upconverts a baseband signal to an intermediate frequency signal based on the reference signal;
A multiplier for generating a multiplied reference signal obtained by multiplying the reference signal output from the reference signal source;
A first millimeter-wave band mixer that up-converts the intermediate frequency signal into a millimeter-wave band based on the multiplied reference signal;
A millimeter-wave band second mixer for up-converting the reference signal output from the reference signal source to the millimeter-wave band based on the multiplied reference signal;
A millimeter-wave transmitter comprising: a millimeter-wave band synthesizer that synthesizes signals up-converted by the millimeter-wave band first mixer and the millimeter-wave band second mixer to generate a millimeter-wave multiplexed signal.    The millimeter wave transmission apparatus according to claim 4, further comprising a millimeter wave bandpass filter that removes a lower sideband of the millimeter wave multiplexed signal as an image signal.    The millimeter wave transmission apparatus according to claim 4, wherein the millimeter wave band first mixer and the millimeter wave band second mixer are second-order even harmonic mixers.    5. The amplifier distribution unit according to claim 4, further comprising: an amplification distribution unit that amplifies the reference signal output from the reference signal source and distributes the reference signal to the IF band mixer, the multiplier, and the millimeter wave band second mixer. Millimeter wave transmitter.    The millimeter wave transmission apparatus according to claim 4, further comprising an IF bandpass filter that passes a lower sideband of the intermediate frequency signal output from the IF band mixer. A reference signal source for outputting a reference signal;
An IF band first mixer that up-converts a first baseband signal into a first intermediate frequency signal based on the reference signal;
An IF band second mixer for up-converting a second baseband signal to a second intermediate frequency signal based on the reference signal;
An IF band synthesizing unit that synthesizes the first intermediate frequency signal and the second intermediate frequency signal;
A multiplier for generating a multiplied reference signal obtained by multiplying the reference signal output from the reference signal source;
A first millimeter-wave band mixer that up-converts the synthesized intermediate frequency signal into a millimeter-wave band based on the multiplied reference signal;
A millimeter-wave band second mixer for up-converting the reference signal output from the reference signal source to the millimeter-wave band based on the multiplied reference signal;
A millimeter-wave transmitter comprising: a millimeter-wave band synthesizer that synthesizes signals up-converted by the millimeter-wave band first mixer and the millimeter-wave band second mixer to generate a millimeter-wave multiplexed signal.    The millimeter wave transmission apparatus according to claim 9, further comprising a millimeter wave bandpass filter that removes a lower sideband of the millimeter wave multiplexed signal as an image signal.    The millimeter wave transmission device according to claim 9, wherein the millimeter wave band first mixer and the millimeter wave band second mixer are second-order even harmonic mixers.    The reference signal output from the reference signal source is amplified, divided into four, and supplied to the IF band first mixer, the multiplier, the millimeter wave band second mixer, and the IF band second mixer. The millimeter wave transmission device according to claim 9, comprising a plurality of amplifiers. An IF band first bandpass filter that passes a lower sideband of the first intermediate frequency signal output from the IF band first mixer;
The millimeter wave transmission apparatus according to claim 9, further comprising an IF band second band pass filter that passes a lower side band of the second intermediate frequency signal output from the IF band second mixer.

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