CN113922831A - Broadband radio frequency signal modulation circuit, equipment and radio frequency transmitter - Google Patents
Broadband radio frequency signal modulation circuit, equipment and radio frequency transmitter Download PDFInfo
- Publication number
- CN113922831A CN113922831A CN202111270354.4A CN202111270354A CN113922831A CN 113922831 A CN113922831 A CN 113922831A CN 202111270354 A CN202111270354 A CN 202111270354A CN 113922831 A CN113922831 A CN 113922831A
- Authority
- CN
- China
- Prior art keywords
- path
- radio frequency
- signal
- active
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 230000015572 biosynthetic process Effects 0.000 claims description 15
- 238000003786 synthesis reaction Methods 0.000 claims description 15
- 230000010355 oscillation Effects 0.000 claims description 9
- 230000002194 synthesizing effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0491—Circuits with frequency synthesizers, frequency converters or modulators
Abstract
The invention relates to a broadband radio frequency signal modulation circuit, equipment and a radio frequency transmitter, wherein the broadband radio frequency signal modulation circuit comprises: a voltage-current converter and an active signal mixing component; the voltage-current converter is connected with the active signal mixing component. The voltage-current converter performs voltage-current conversion on the received first baseband signal to obtain a converted second baseband signal; and the active signal frequency mixing component carries out frequency conversion processing on the second baseband signal to obtain a radio frequency signal. By adopting the technical scheme of the invention, the active signal frequency mixing component is utilized to convert the baseband signal into the radio frequency, so that the problem of nonlinearity under a large voltage can be avoided to a certain extent, the problem of signal nonlinearity is reduced, and the modulation fault rate of the radio frequency signal is reduced.
Description
Technical Field
The invention relates to the technical field of signal modulation, in particular to a broadband radio frequency signal modulation circuit, broadband radio frequency signal modulation equipment and a radio frequency transmitter.
Background
Radio frequency is the electromagnetic frequency that can be radiated into space, ranging from 300kHz to 300 GHz. The radio frequency is radio frequency current, and is high-frequency alternating current variable electromagnetic wave. Radio frequency technology is widely used in the field of wireless communication, and cable television systems adopt a radio frequency transmission mode.
In the prior art, a radio frequency transmitter usually works in a large-signal high-power state, a non-linearity problem is easy to occur, and for a broadband system, the linearity is further deteriorated, so that radio frequency signal modulation is influenced, and radio frequency signal modulation faults are easy to occur.
Therefore, how to reduce the signal nonlinearity and the modulation failure rate of the rf signal is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a wideband radio frequency signal modulation circuit, a device and a radio frequency transmitter, so as to solve the problem in the prior art that in a large-signal high-power state, nonlinearity is easily generated, which affects radio frequency signal modulation and easily generates a radio frequency signal modulation fault.
In order to achieve the purpose, the invention adopts the following technical scheme:
a wideband radio frequency signal modulation circuit comprising: a voltage-current converter and an active signal mixing component;
the voltage-current converter is connected with the active signal frequency mixing component;
the voltage-current converter is used for performing voltage-current conversion on the received first baseband signal to obtain a converted second baseband signal;
the active signal mixing component is used for carrying out frequency conversion processing on the second baseband signal to obtain a radio frequency signal.
Further, in the above wideband rf signal modulation circuit, the active signal mixing component includes: an active mixer and a local oscillator supply assembly;
the active frequency mixer is connected with the local vibration source providing component;
the local vibration source providing component is used for providing a target local vibration source for the active mixer;
the active mixer is configured to perform frequency conversion processing on the second baseband signal by using the target local oscillation source to obtain the radio frequency signal.
Further, in the above broadband radio frequency signal modulation circuit, the local oscillator supply module includes: a frequency synthesis component and a multiplexer;
the frequency synthesis component and the active mixer are respectively connected with the multiplexer;
the frequency synthesis component is used for synthesizing a local vibration source and providing a target local vibration source for the active mixer through the multiplexer.
Further, in the above wideband rf signal modulating circuit, the active mixer includes: an I path active mixer and a Q path active mixer;
the target local vibration source comprises: the circuit comprises an I path of local vibration source and a Q path of local vibration source;
the frequency synthesis component is respectively connected with the I-path active mixer and the Q-path active mixer through the multi-path selector;
the frequency synthesis component provides the I path of local vibration source for the I path of active mixer through the multiplexer, and the frequency synthesis component provides the Q path of local vibration source for the Q path of active mixer through the multiplexer.
Further, in the above wideband rf signal modulation circuit, the voltage-to-current converter includes: the I-path voltage-current converter and the Q-path voltage-current converter;
the first baseband signal includes: a first I baseband signal and a first Q baseband signal;
the second baseband signal includes: a second I baseband signal and a second Q baseband signal;
the I-path voltage-current converter is connected with the I-path active mixer;
the Q-path voltage-current converter is connected with the Q-path active mixer;
the I-path voltage-current converter is used for performing voltage-current conversion on the first I-path baseband signal to obtain a second I-path baseband signal and transmitting the second I-path baseband signal to the I-path active mixer;
the Q-path voltage-current converter is used for performing voltage-current conversion on the first Q-path baseband signal to obtain a second Q-path baseband signal and transmitting the second Q-path baseband signal to the Q-path active mixer;
the I path active frequency mixer performs frequency conversion processing on the second I path baseband signal by using the I path local oscillator to obtain the I path radio frequency signal; and the Q-path active frequency mixer performs frequency conversion processing on the second Q-path baseband signal by using the Q-path local oscillator source to obtain the Q-path radio frequency signal.
Further, the above wideband rf signal modulation circuit further includes: a radio frequency signal combining component;
the I path of active mixer and the Q path of active mixer are respectively connected with the radio frequency signal combination component;
the radio frequency signal combination component is used for combining the I-path radio frequency signal output by the I-path active mixer and the Q-path radio frequency signal output by the Q-path active mixer into the radio frequency signal.
Further, in the broadband radio frequency signal modulation circuit, the I-path local oscillation source is 0 °/180 °; the Q-path local vibration source is 90 DEG/270 deg.
The invention also provides broadband radio frequency signal modulation equipment which comprises the broadband radio frequency signal modulation circuit.
The invention also provides a radio frequency transmitter which comprises the broadband radio frequency signal modulation equipment.
Further, the radio frequency transmitter further includes: a digital signal processing device;
the digital signal processing equipment is connected with the broadband radio frequency signal modulation equipment;
the digital signal processing device is used for performing signal processing on an initial digital signal generated by the radio frequency transmitter, converting the initial digital signal into an analog signal, and sending the analog signal to the broadband radio frequency signal modulation device, so that the broadband radio frequency signal modulation device performs radio frequency signal modulation on the analog signal as a first baseband signal to obtain a radio frequency signal.
A wideband radio frequency signal modulation circuit, device and radio frequency transmitter, the wideband radio frequency signal modulation circuit comprising: a voltage-current converter and an active signal mixing component; the voltage-current converter is connected with the active signal mixing component. The voltage-current converter performs voltage-current conversion on the received first baseband signal to obtain a converted second baseband signal; and the active signal frequency mixing component carries out frequency conversion processing on the second baseband signal to obtain a radio frequency signal. By adopting the technical scheme of the invention, the active signal frequency mixing component is utilized to convert the baseband signal into the radio frequency, so that the problem of nonlinearity under a large voltage can be avoided to a certain extent, the problem of signal nonlinearity is reduced, and the modulation fault rate of the radio frequency signal is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a circuit diagram provided by one embodiment of a wideband radio frequency signal modulation circuit of the present invention;
fig. 2 is a schematic diagram of an embodiment of a radio frequency transmitter of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Fig. 1 is a circuit diagram provided by an embodiment of a wideband rf signal modulation circuit of the present invention, and as shown in fig. 1, the wideband rf signal modulation circuit of the present embodiment includes: a voltage-to-current converter 101 and an active signal mixing component 102; the voltage to current converter 101 is connected to the active signal mixing component 102.
In this embodiment, the voltage-to-current converter 101 may receive a first baseband signal that needs to be modulated, and perform voltage-to-current conversion on the first baseband signal, that is, convert the voltage signal into a current signal, so as to obtain a converted second baseband signal. Then, the voltage-current converter 101 transmits the converted second baseband signal to the active signal mixing component 102, and the active signal mixing component 102 performs frequency conversion processing on the second baseband signal to obtain a frequency-converted radio frequency signal C, so that the transmitter transmits the radio frequency signal C. By adopting the technical scheme of the embodiment, the active signal mixing component 102 is utilized to convert the baseband signal into the radio frequency, so that the problem of nonlinearity under a large voltage can be avoided to a certain extent, the problem of signal nonlinearity is reduced, and the modulation fault rate of the radio frequency signal is reduced.
Further, in the wideband rf signal modulation circuit of this embodiment, the active signal mixing component 102 includes: an active mixer 1021 and a local oscillator supply component. An active mixer 1021 is coupled to the local oscillator supply component. The local oscillation source providing component provides a target local oscillation source to the active mixer 1021, so that the active mixer 1021 performs frequency conversion processing on the received second baseband signal by using the target local oscillation source, thereby obtaining a modulated radio frequency signal C.
Further, in the broadband radio frequency signal modulation circuit of this embodiment, the local oscillator supply component includes: a frequency synthesis component and a multiplexer 1022. The frequency synthesizing component and the active mixer 1021 are connected to a multiplexer 1022, respectively. The frequency synthesis component may synthesize the local oscillator, transmit the local oscillator to the multiplexer 1022, and provide the target local oscillator required by the active mixer 1021 for rf signal modulation to the active mixer 1021 after the local oscillator is selected by the multiplexer 1022.
Further, in the wideband rf signal modulation circuit of the present embodiment, the voltage-to-current converter 101 includes: an I-way voltage-to-current converter 1011 and a Q-way voltage-to-current converter 1012. The first baseband signal includes: a first I baseband signal A1 and a first Q baseband signal A2; the second baseband signal includes: a second I baseband signal a1 and a second Q baseband signal a 2. The I-path voltage-to-current converter 1011 and the Q-path voltage-to-current converter 1012 are connected to an active mixer 1021, respectively. The I-path voltage-current converter 1011 may perform voltage-current conversion on the received first I-path baseband signal a1, convert the voltage signal into a current signal, thereby obtaining a second I-path baseband signal, and transmit the second I-path baseband signal to the active mixer 1021; the Q-path voltage-current converter 1012 may perform voltage-current conversion on the received first Q-path baseband signal a2, convert the voltage signal into a current signal, thereby obtaining a second Q-path baseband signal, and transmit the second Q-path baseband signal to the active mixer 1021.
Further, in the wideband rf signal modulating circuit of the present embodiment, the active mixer 1021 includes: an I-path active mixer 10211 and a Q-path active mixer 10212; the target local vibration source comprises: the I-path local oscillation source B1 and the Q-path local oscillation source B2. The I-path voltage-current converter 1011 is connected to the I-path active mixer 10211, and the Q-path voltage-current converter 1012 is connected to the Q-path active mixer 10212. The frequency synthesizing components are connected to the I-path active mixer 10211 and the Q-path active mixer 10212 through the multiplexer 1022. The frequency synthesis component provides an I-path local oscillator to the I-path active mixer through the multiplexer 1022, and provides a Q-path local oscillator to the Q-path active mixer through the multiplexer 1022. Wherein, the local vibration source of the I path is preferably 0 degree/180 degrees; the Q-path natural vibration source is preferably 90/270.
Further, the wideband rf signal modulating circuit of the present embodiment further includes an rf signal combining component. The I-path active mixer 10211 and the Q-path active mixer 10212 are respectively connected to the rf signal combining component. The rf signal combining component may receive the I path rf signal transmitted by the I path active mixer 10211 and the Q path rf signal transmitted by the Q path active mixer 10212, and combine the I path rf signal and the Q path rf signal into an rf signal C, so that the transmitter transmits the rf signal C.
In order to be more comprehensive, the present application also provides a wideband radio frequency signal modulation device corresponding to the wideband radio frequency signal modulation circuit provided by the embodiment of the present invention.
The broadband radio frequency signal modulation device of this embodiment includes the broadband radio frequency signal modulation circuit described in the above embodiment, and by using the broadband radio frequency signal modulation device of this embodiment and using the active signal mixing component 102 arranged inside the device to convert the baseband signal to radio frequency, the problem of nonlinearity under a large voltage can be avoided to a certain extent, and the problem of signal nonlinearity is reduced, thereby reducing the radio frequency signal modulation failure rate.
Fig. 2 is a schematic structural diagram of an embodiment of the rf transmitter of the present invention, and as shown in fig. 2, the rf transmitter of this embodiment includes: the wideband radio frequency signal modulating device 22 described in the above embodiments. The radio frequency transmitter of this embodiment may modulate the baseband signal generated by the wideband radio frequency signal modulating device 22 to obtain the radio frequency signal C, so that the radio frequency transmitter may transmit the radio frequency signal C. By adopting the technical scheme of the embodiment, the baseband signal is converted into the radio frequency by using the active signal mixing component 102 arranged in the baseband signal, so that the problem of nonlinearity under a large voltage can be avoided to a certain extent, the problem of signal nonlinearity is reduced, and the modulation fault rate of the radio frequency signal is reduced.
Further, the radio frequency transmitter of the present embodiment further includes: a digital signal processing device 21. The digital signal processing device 21 is connected to a broadband radio frequency signal modulation device 22. The digital signal processing device 21 may perform signal processing (e.g., signal filtering, signal conversion, etc.) on the initial digital signal generated by the radio frequency transmitter, convert the initial digital signal into an analog signal, and transmit the analog signal to the wideband radio frequency signal modulation device 22, and the wideband radio frequency signal modulation device 22 modulates the analog signal to obtain the modulated radio frequency signal C.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A wideband radio frequency signal modulation circuit, comprising: a voltage-current converter and an active signal mixing component;
the voltage-current converter is connected with the active signal frequency mixing component;
the voltage-current converter is used for performing voltage-current conversion on the received first baseband signal to obtain a converted second baseband signal;
the active signal mixing component is used for carrying out frequency conversion processing on the second baseband signal to obtain a radio frequency signal.
2. The wideband radio frequency signal modulation circuit of claim 1, wherein the active signal mixing component comprises: an active mixer and a local oscillator supply assembly;
the active frequency mixer is connected with the local vibration source providing component;
the local vibration source providing component is used for providing a target local vibration source for the active mixer;
the active mixer is configured to perform frequency conversion processing on the second baseband signal by using the target local oscillation source to obtain the radio frequency signal.
3. The wideband radio frequency signal modulation circuit according to claim 2, wherein the local oscillator supply component comprises: a frequency synthesis component and a multiplexer;
the frequency synthesis component and the active mixer are respectively connected with the multiplexer;
the frequency synthesis component is used for synthesizing a local vibration source and providing a target local vibration source for the active mixer through the multiplexer.
4. The wideband radio frequency signal modulation circuit of claim 3, wherein the active mixer comprises: an I path active mixer and a Q path active mixer;
the target local vibration source comprises: the circuit comprises an I path of local vibration source and a Q path of local vibration source;
the frequency synthesis component is respectively connected with the I-path active mixer and the Q-path active mixer through the multi-path selector;
the frequency synthesis component provides the I path of local vibration source for the I path of active mixer through the multiplexer, and the frequency synthesis component provides the Q path of local vibration source for the Q path of active mixer through the multiplexer.
5. The wideband radio frequency signal modulation circuit of claim 4, wherein the voltage-to-current converter comprises: the I-path voltage-current converter and the Q-path voltage-current converter;
the first baseband signal includes: a first I baseband signal and a first Q baseband signal;
the second baseband signal includes: a second I baseband signal and a second Q baseband signal;
the I-path voltage-current converter is connected with the I-path active mixer;
the Q-path voltage-current converter is connected with the Q-path active mixer;
the I-path voltage-current converter is used for performing voltage-current conversion on the first I-path baseband signal to obtain a second I-path baseband signal and transmitting the second I-path baseband signal to the I-path active mixer;
the Q-path voltage-current converter is used for performing voltage-current conversion on the first Q-path baseband signal to obtain a second Q-path baseband signal and transmitting the second Q-path baseband signal to the Q-path active mixer;
the I path active frequency mixer performs frequency conversion processing on the second I path baseband signal by using the I path local oscillator to obtain the I path radio frequency signal; and the Q-path active frequency mixer performs frequency conversion processing on the second Q-path baseband signal by using the Q-path local oscillator source to obtain the Q-path radio frequency signal.
6. The wideband radio frequency signal modulation circuit of claim 5, further comprising: a radio frequency signal combining component;
the I path of active mixer and the Q path of active mixer are respectively connected with the radio frequency signal combination component;
the radio frequency signal combination component is used for combining the I-path radio frequency signal output by the I-path active mixer and the Q-path radio frequency signal output by the Q-path active mixer into the radio frequency signal.
7. The wideband radio frequency signal modulation circuit according to claim 4, wherein the path I local oscillation source is 0 °/180 °; the Q-path local vibration source is 90 DEG/270 deg.
8. A wideband radio frequency signal modulation apparatus comprising the wideband radio frequency signal modulation circuitry according to any of claims 1 to 6.
9. A radio frequency transmitter comprising the wideband radio frequency signal modulating device of claim 7.
10. The radio frequency transmitter of claim 9, further comprising: a digital signal processing device;
the digital signal processing equipment is connected with the broadband radio frequency signal modulation equipment;
the digital signal processing device is used for performing signal processing on an initial digital signal generated by the radio frequency transmitter, converting the initial digital signal into an analog signal, and sending the analog signal to the broadband radio frequency signal modulation device, so that the broadband radio frequency signal modulation device performs radio frequency signal modulation on the analog signal as a first baseband signal to obtain a radio frequency signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111270354.4A CN113922831A (en) | 2021-10-29 | 2021-10-29 | Broadband radio frequency signal modulation circuit, equipment and radio frequency transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111270354.4A CN113922831A (en) | 2021-10-29 | 2021-10-29 | Broadband radio frequency signal modulation circuit, equipment and radio frequency transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113922831A true CN113922831A (en) | 2022-01-11 |
Family
ID=79243454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111270354.4A Pending CN113922831A (en) | 2021-10-29 | 2021-10-29 | Broadband radio frequency signal modulation circuit, equipment and radio frequency transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113922831A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707475A (en) * | 2009-11-04 | 2010-05-12 | 捷顶微电子（上海）有限公司 | High-linearity upper frequency mixer with controllable output voltage and frequency mixing method |
| CN102332866A (en) * | 2011-09-07 | 2012-01-25 | 豪威科技(上海)有限公司 | High-linearity upper mixer |
| CN110492890A (en) * | 2019-07-23 | 2019-11-22 | 华南理工大学 | A kind of current mode radio-frequency emission front-end circuit, signal processing method and emission system |
-
2021
- 2021-10-29 CN CN202111270354.4A patent/CN113922831A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707475A (en) * | 2009-11-04 | 2010-05-12 | 捷顶微电子（上海）有限公司 | High-linearity upper frequency mixer with controllable output voltage and frequency mixing method |
| CN102332866A (en) * | 2011-09-07 | 2012-01-25 | 豪威科技(上海)有限公司 | High-linearity upper mixer |
| CN110492890A (en) * | 2019-07-23 | 2019-11-22 | 华南理工大学 | A kind of current mode radio-frequency emission front-end circuit, signal processing method and emission system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100214365B1 (en) | Radio receiver | |
| US20190379571A1 (en) | Polar phased-array transmitter and mobile terminal | |
| US7983328B2 (en) | Data transmission device | |
| EP1605585B1 (en) | Harmonic mixer using anti parallel diodes | |
| CN113471686A (en) | Active integrated electrically-modulated polarized transmitting-receiving panel antenna | |
| CN101146071A (en) | Bidirectional signal transmission device and method | |
| CN102638228A (en) | Up-converter and up-conversion method | |
| CN210111948U (en) | Comb signal source based on mixing modulation feedback loop | |
| CN113922831A (en) | Broadband radio frequency signal modulation circuit, equipment and radio frequency transmitter | |
| KR20050113308A (en) | Apparatus and method for generating multi re tone singals in uwb communication system | |
| US9614552B2 (en) | Millimeter-wave modulation device | |
| US7801246B2 (en) | Multi-mode communication device for generating constant envelope modulated signals using a quadrature modulator | |
| Nasr et al. | A Highly Integrated 60-GHz 6-Channel Transceiver Chip in 0.35 µm SiGe Technology for Smart Sensing and Short-Range Communications | |
| US20120282866A1 (en) | Radio transceiver architecture | |
| US20040014446A1 (en) | Methods and systems for odd-order LO compensation for even-harmonic mixers | |
| CN101552765A (en) | QAM modulator for cable digital television and carrier generation circuit thereof | |
| JP4116507B2 (en) | Optical transmitter for optical-wireless communication system | |
| KR20120070806A (en) | Apparatus for up-converting digital radio frequency | |
| JP2593020B2 (en) | Wireless communication device | |
| KR20110023541A (en) | Reader of rfid | |
| TWI774254B (en) | Wireless transceiver having in-phase quadrature-phase calibration function | |
| CN112886983B (en) | Communication transceiver and terminal device | |
| JP2003273818A (en) | Apparatus and method for converting frequency | |
| CN114978331B (en) | Microwave millimeter wave signal transmitting system based on optical heterodyne | |
| CN107979422B (en) | Radio over fiber network node, radio access point and radio over fiber communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220111 |