CN114978233A - Spread spectrum device and spread spectrum method based on NOVA radio frequency test platform - Google Patents
Spread spectrum device and spread spectrum method based on NOVA radio frequency test platform Download PDFInfo
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- CN114978233A CN114978233A CN202210508160.1A CN202210508160A CN114978233A CN 114978233 A CN114978233 A CN 114978233A CN 202210508160 A CN202210508160 A CN 202210508160A CN 114978233 A CN114978233 A CN 114978233A
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- 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
- H04B1/69—Spread spectrum techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a spread spectrum device and a spread spectrum method based on an automatic radio frequency test platform (NOVA), which mainly comprise a signal generator, a frequency mixer, a power divider and a radio frequency switch. The PXI platform and the signal generator simultaneously send out radio frequency signals, after the signals sent out by the signal generator pass through the power divider, a part of the signals are coupled with the signals sent out by the PXI platform in the frequency mixer to generate required radio frequency signals, and then the radio frequency signals pass through the radio frequency access matrix, reach a chip to be tested and then return to the radio frequency access matrix; and finally, the frequency of the signal is coupled with the other path of signal in the power divider in a mixer, and the frequency is reduced to be below 6GHz, so that signal sampling and processing are realized. According to the invention, the measurable frequency ranges of the four radio frequency channels are promoted to the K wave band through the radio frequency switch matrix, and the multichannel spread spectrum upgrade of the NOVA is carried out on the automatic test platform, so that the test platform can meet the ultrahigh-frequency power and S parameter test requirements of a radio frequency chip which has multiple channels and needs to be switched at high speed.
Description
Technical Field
The invention belongs to the technical field of radio frequency testing, and particularly relates to a spread spectrum device and a spread spectrum method based on an NOVA radio frequency testing platform.
Background
At present, most of the main commercial automatic radio frequency test platforms at home and abroad still have the upper limit of the test frequency of 6GHz, and the test requirements of partial 5G and millimeter waves cannot be met. The automatic radio frequency test equipment of higher frequency band of the foreign branch supplier has high cost, and the software updating is limited by License management and control of the foreign supplier, so that the problems of opaque partial pricing, slow response period and the like exist. The radio frequency test platform NOVA is a radio frequency test platform developed by the applicant from 2013, and mainly comprises a PXI chassis and a radio frequency channel matrix, wherein the PXI chassis mainly provides power supply voltage, logic voltage, test vectors, radio frequency signals and the like of a chip, the radio frequency channel matrix can rapidly and stably switch input and output ports of the signals, the radio frequency channel matrix is provided with 4 transmitting ports (capable of realizing filtering of different frequency bands), 32 transmitting/receiving ports and 16 antenna ports (capable of realizing harmonic testing), and the input ports and the output ports are adjusted to chip Pin pins required by corresponding test items at any time through Pogo pins of Socket, so that automatic testing of a multi-port radio frequency chip is realized. Some rf chip manufacturers in the country have been served by 2017 but were also subject to a measurable frequency range before updating, i.e., the transmitted and tested rf signal must be below 6 GHz. However, with the 5G era and the arrival of millimeter waves, the requirements for updating standards and testing higher frequency bands are increasing. The NOVA is the same as most commercial radio frequency test platforms in the market, and also faces the problem that the upper limit of the test frequency needs to be broken through urgently.
Disclosure of Invention
The technical problems solved by the invention are as follows: a spread spectrum device based on a NOVA radio frequency test platform is provided, which can expand a measurable frequency range from 6GHz to 26GHz and can measure the third harmonic and partial millimeter wave of radio frequency signals with the frequency within 6 GHz.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a spread spectrum device based on a NOVA radio frequency test platform comprises: the PXI platform, a signal generator, a frequency mixer, a power divider, a radio frequency switch and a radio frequency access matrix, wherein the signal generator is connected with the power divider, the power divider is respectively connected with the frequency mixer A and the frequency mixer B, the signal generator sends out radio frequency signals, the radio frequency signals respectively enter the frequency mixer A and the frequency mixer B after passing through the power divider, and the up/down conversion of the radio frequency signals is realized; the mixer A is connected with the output end of the PXI platform and the radio frequency access matrix through the radio frequency switch; the mixer B is connected with the input end of the PXI platform and the radio frequency access matrix through the radio frequency switch; the PXI platform and the signal generator simultaneously send out radio frequency signals, after the signals sent out by the signal generator pass through the power divider, a part of the signals are coupled with the signals sent out by the PXI platform in the frequency mixer to generate required radio frequency signals, then the radio frequency signals pass through the radio frequency access matrix and reach the input end of the chip to be tested, and the radio frequency signals flow out from the output end of the chip to be tested after passing through the internal circuit of the chip to be tested and return to the radio frequency access matrix; and finally, coupling the signal with the other path of signal in the power divider in a mixer to reduce the frequency to be lower than 6GHz, and entering a PXI platform to realize signal sampling and processing.
Preferably, the radio frequency switches include a radio frequency switch K1, a radio frequency switch K2, a radio frequency switch K3 and a radio frequency switch K2, and single-pole double-throw switches are adopted. The power supply voltage required by the switch and the logic voltage required by the switch are both provided by the power supply management module in the radio frequency path matrix, and the response time of the switching voltage is us level.
Preferably, an input port RFin of the PXI platform is connected with the mixer B and the radio frequency access matrix through a radio frequency switch K2 and a radio frequency switch K4; the output port of the PXI platform is connected with the mixer A and the radio frequency access matrix through the radio frequency switch K1 and the radio frequency switch K3, and the radio frequency switch realizes switching between a direct radio frequency access matrix and a frequency conversion mode of the PXI platform.
Preferably, when radio frequency signals are required to directly reach the radio frequency path matrix from the RFout port of the PXI platform, the radio frequency switch K1 and the radio frequency switch K3 are placed in state 1; when the radio frequency channel matrix is reached after the frequency boosting is needed, the radio frequency switch K1 and the radio frequency switch K3 are set to be in a state 2; when the signals output from the radio frequency access matrix need to be directly connected to an input port RFin of the PXI platform, the radio frequency switch K2 and the radio frequency switch K4 are set to be in a state 1; when the input port RFin is reached after down conversion, the rf switch K2 and the rf switch K4 are set to state 2.
Preferably, the signal generator adopts an HMC-T2220 signal generator and transmits a single-frequency signal of 10MHz-20 GHz.
Preferably, the mixer is a M20026LP mixer of Marki, the RF/LO port of the mixer passes radio frequency signals of 0.1-26.5GHz, and the IF port of the mixer passes radio frequency signals below 6 GHz.
Has the advantages that: compared with the prior art, the invention has the following advantages:
the NOVA radio frequency test platform comprises a PXI platform and a radio frequency access matrix, a radio frequency signal generator, a mixer, a power divider and other radio frequency components are utilized, main voltage required by a switch and logic voltage required by switching are distributed through a programmable logic device, and high speed and stable switching of the radio frequency switch are guaranteed. The measurable frequency ranges of the radio frequency channels are increased to the K wave band by using the radio frequency switch matrix, and the multichannel spread spectrum of the NOVA is upgraded, so that the self-developed test platform can meet the test requirements of ultrahigh frequency power and S parameters of customers.
Drawings
FIG. 1 is a schematic diagram of a spread spectrum device based on a NOVA radio frequency test platform;
fig. 2 is a flow chart of the test of the spread spectrum device based on the NOVA radio frequency test platform.
Detailed Description
The present invention will be further illustrated by the following specific examples, which are carried out on the premise of the technical scheme of the present invention, and it should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, the spread spectrum device based on the NOVA radio frequency test platform of the present invention includes a PXI platform, a radio frequency access Matrix (Matrix), a built-in signal generator, two mixers (mixers), a power divider, four single-pole double-throw radio frequency switches, and other radio frequency components. The signal generator is connected with the power divider, the power divider is respectively connected with the frequency mixer A and the frequency mixer B, the signal generator sends out radio-frequency signals, and the radio-frequency signals respectively enter the frequency mixer A and the frequency mixer B after passing through the power divider, so that the up/down conversion of the radio-frequency signals is realized; the mixer A is connected with the output end of the PXI platform and the radio frequency access matrix through the radio frequency switch; and the mixer B is connected with the input end of the PXI platform and the radio frequency path matrix through the radio frequency switch.
The signal generator is HMC-T2220 of Hittite company, can transmit single-frequency signals of 10MHz-20GHz, and has the highest transmission power of +28 dBm. The test platform is connected by the Ethernet, program control is realized, and the center frequency, the transmitting power and the like of the transmitted radio frequency signal can be controlled by codes.
The mixer adopts M20026LP of Marki, and the up/down conversion of the radio frequency signal is realized in a mixing mode. The RF/LO port can pass through radio frequency signals of 0.1-26.5GHz, the IF port can pass through radio frequency signals below 6GHz, the LO driving power can reach +18dBm, and the conversion loss is about 8 dB.
The radio frequency switch comprises a radio frequency switch K1, a radio frequency switch K2, a radio frequency switch K3 and a radio frequency switch K2 which are all single-pole double-throw switches. An input port RFin of the PXI platform is connected with the mixer B and the radio frequency access matrix through a radio frequency switch K2 and a radio frequency switch K4; the output port of the PXI platform is connected with the mixer A and the radio frequency access matrix through the radio frequency switch K1 and the radio frequency switch K3, and the radio frequency switch realizes switching between a direct radio frequency access matrix and a frequency conversion mode of the PXI platform.
The 4 single-pole double-throw radio frequency switches are divided into two groups, the single-pole double-throw radio frequency switches are adopted, the radio frequency switch K1 and the radio frequency switch K3 are one group, and the radio frequency switch K2 and the radio frequency switch K4 are one group. When radio frequency signals are required to directly reach the radio frequency path matrix from the RFout port of the PXI, K1 and K3 are placed in a state 1; when the RF path matrix is reached after the up-conversion is needed, K1 and K3 are placed in state 2. Similarly, when signals from the radio frequency access matrix need to be directly connected to the RFin port of the PXI, K2 and K4 are set to be in a state 1; when the RFin port is reached after down conversion, K2 and K4 are set to state 2. Therefore, the PXI direct radio frequency path matrix (Thru state) and the frequency conversion (Freq _ EX state) can be switched, the radio frequency switch has a reference main voltage of 3.3V and a switching voltage of 3V, and the provided voltage level is changed through the programmable logic array to switch the state of the switch.
As shown in fig. 2, firstly, the program controls the PXI and the signal generator to simultaneously emit radio frequency signals, and after the signals emitted by the signal generator pass through the power divider, a part of the signals are coupled with the signals emitted by the PXI in the mixer, and are up-converted to generate the required radio frequency signals RF. Then, the radio frequency signal RF passes through the radio frequency path matrix and reaches the input end of the chip to be tested, and the radio frequency signal RF flows out from the output end and returns to the radio frequency path matrix after passing through the internal circuit of the chip. And finally, the frequency of the other path of signal in the power divider is coupled in a mixer for down-conversion, the frequency is reduced to be below 6GHz, and signal sampling and processing are realized in PXI.
The invention also discloses a spread spectrum method based on the NOVA radio frequency test platform, which upgrades the iTest test platform in the aspect of software and increases the switch switching control of a matrix access and the calibration of a higher frequency band. The power management module in the radio frequency matrix channel provides power supply voltage and switching logic voltage required by four switches of the spread spectrum module, so that each radio frequency channel can have two modes of direct connection and frequency conversion, for example, a pluggable channel TX11 is expanded into direct connection TX11_ Thur and TX11_ EX, the states correspond to different spread spectrum switch states, and different path states are corresponding after a channel name is written in an iTest platform. The upgrading of the calibration system is composed of two elements of a path and a frequency point, the radio frequency path and the frequency point required by each group, such as TRX11_ EX _10GHz, have the power value measured by a power meter and the radio frequency signal power sent by PXI to obtain the calibration value of the path at the frequency point, and all data are recorded in a calibration array to wait for calling. The measurable frequency range is expanded from 6GHz to 26GHz, and third harmonic waves and partial millimeter waves of radio frequency signals with the frequency within 6GHz can be tested.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A spread spectrum device based on a NOVA radio frequency test platform is characterized by comprising: PXI platform, signal generator, mixer, power divider, RF switch and RF path matrix,
the signal generator is connected with the power divider, the power divider is respectively connected with the frequency mixer A and the frequency mixer B, the signal generator sends out radio-frequency signals, and the radio-frequency signals respectively enter the frequency mixer A and the frequency mixer B after passing through the power divider, so that the up/down conversion of the radio-frequency signals is realized;
the mixer A is connected with the output end of the PXI platform and the radio frequency access matrix through the radio frequency switch;
the mixer B is connected with the input end of the PXI platform and the radio frequency access matrix through the radio frequency switch;
the PXI platform and the signal generator simultaneously send out radio frequency signals, after the signals sent out by the signal generator pass through the power divider, a part of the signals are coupled with the signals sent out by the PXI platform in the frequency mixer to generate required radio frequency signals, then the radio frequency signals pass through the radio frequency access matrix and reach the input end of the chip to be tested, and the radio frequency signals flow out from the output end of the chip to be tested after passing through the internal circuit of the chip to be tested and return to the radio frequency access matrix; and finally, coupling the other path of signal in the power divider in a mixer to reduce the frequency to be lower than 6GHz, and entering a PXI platform to realize signal sampling and processing.
2. The NOVA radio frequency test platform based spread spectrum device of claim 1, wherein: the radio frequency switch comprises a radio frequency switch K1, a radio frequency switch K2, a radio frequency switch K3 and a radio frequency switch K2 which are all single-pole double-throw switches.
3. The NOVA radio frequency test platform based spread spectrum device of claim 2, wherein: an input port RFin of the PXI platform is connected with the mixer B and the radio frequency access matrix through a radio frequency switch K2 and a radio frequency switch K4; the output port of the PXI platform is connected with the mixer A and the radio frequency access matrix through the radio frequency switch K1 and the radio frequency switch K3, and the radio frequency switch realizes switching between a direct radio frequency access matrix and a frequency conversion mode of the PXI platform.
4. The NOVA radio frequency test platform-based spread spectrum device of claim 3, wherein: when radio frequency signals are required to directly reach the radio frequency access matrix from the RFout port of the PXI platform, the radio frequency switch K1 and the radio frequency switch K3 are set to be in a state 1; when the radio frequency channel matrix is reached after the frequency is increased, the radio frequency switch K1 and the radio frequency switch K3 are in a state 2; when signals output from the RF access matrix need to be directly connected to an input port RFin of the PXI platform, the RF switch K2 and the RF switch K4 are set to be in a state 1; when the input port RFin is reached after down conversion, the rf switch K2 and the rf switch K4 are set to state 2.
5. The NOVA radio frequency test platform based spread spectrum device of claim 1, wherein: the signal generator adopts an HMC-T2220 signal generator and transmits a single-frequency signal of 10MHz-20 GHz.
6. The NOVA radio frequency test platform based spread spectrum device of claim 1, wherein: the mixer adopts Marki's M20026LP mixer, and its RF/LO port passes through 0.1-26.5 GHz's radio frequency signal, and the IF port passes through the radio frequency signal below 6 GHz.
7. A spread spectrum method based on NOVA radio frequency test platform, realized based on the spread spectrum device of any claim 1-6, characterized in that: through a power management module in a radio frequency matrix channel, power supply voltages and switching logic voltages required by four switches of a spread spectrum module are provided, so that each radio frequency channel can have a direct connection mode and a frequency conversion mode; the calibration system is composed of two elements of a channel and a frequency point, the power value measured by the power meter is compared with the power value of the radio frequency signal sent by the PXI for each group of required radio frequency channel and frequency point to obtain the calibration value of the channel at the frequency point, all data are recorded in the calibration array to wait for calling, the measurable frequency range can be expanded from 6GHz to 26GHz, and the third harmonic and partial millimeter wave of the radio frequency signal with the frequency within 6GHz can be tested.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6370372B1 (en) * | 2000-09-25 | 2002-04-09 | Conexant Systems, Inc. | Subharmonic mixer circuit and method |
| WO2018090847A1 (en) * | 2016-11-17 | 2018-05-24 | 中兴通讯股份有限公司 | Radio frequency reflection wave detection device, wireless communication system and antenna state detection method |
| CN114280462A (en) * | 2021-12-30 | 2022-04-05 | 北京航天测控技术有限公司 | Radio frequency integrated circuit testing device and testing platform |
| CN217307687U (en) * | 2022-05-11 | 2022-08-26 | 江苏艾科半导体有限公司 | Spread spectrum device based on NOVA radio frequency test platform |
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- 2022-05-11 CN CN202210508160.1A patent/CN114978233A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6370372B1 (en) * | 2000-09-25 | 2002-04-09 | Conexant Systems, Inc. | Subharmonic mixer circuit and method |
| WO2018090847A1 (en) * | 2016-11-17 | 2018-05-24 | 中兴通讯股份有限公司 | Radio frequency reflection wave detection device, wireless communication system and antenna state detection method |
| CN114280462A (en) * | 2021-12-30 | 2022-04-05 | 北京航天测控技术有限公司 | Radio frequency integrated circuit testing device and testing platform |
| CN217307687U (en) * | 2022-05-11 | 2022-08-26 | 江苏艾科半导体有限公司 | Spread spectrum device based on NOVA radio frequency test platform |
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