Frequency spectrum spread spectrum frequency conversion device
By designing a spectrum spread spectrum conversion device including duplexer, frequency multiplier and mixer, the existing spectrum analyzer has solved the problem of small signal dynamic range and single function in high-band tests, and achieved the diversity and accurate measurement of high-band signals.
Patent Information
- Application Number
- CN202421693925.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-17
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-07-17
AI Technical Summary
In the test requirements of existing spectrum analyzers in high-frequency bands, the spread spectrum device is usually passive high-order harmonic mixing, resulting in a small signal dynamic range and a rising noise floor. It is impossible to effectively expand the measurement frequency of the spectrum analyzer and has a single function.
A spectrum spread spectrum conversion device is designed, including a duplexer, frequency multiplier and mixer in the housing, as well as multiple interfaces on the housing. Through the combined use of these components, multiple modes of spectrum spread spectrum, downconversion and upconversion are realized, which expands the scope of application of the instrument.
The diversity of spectrum spread spectrum variable frequency conversion devices is realized, the scope of application of the instrument is effectively expanded, the dynamic range of the signal is improved, the noise floor is reduced, and the high-frequency band signals can be measured more accurately.
Smart Images
Figure CN222884678U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electronic communications, in particular to a spectrum spreading and frequency conversion device. Background Art
[0002] Spectrum analyzers are important instruments for signal analysis and play an irreplaceable role in the field of microwave communications. Currently, the main international suppliers of spectrum analyzers are Keysight Technologies in the United States and Rohde & Schwarz in Germany. The frequencies of mainstream spectrum analyzers are basically 50GHz. Although 67GHz spectrum analyzers have been launched with the advancement of technology, the higher the frequency, the more expensive it is. In order to meet the testing needs of various users for high-frequency bands, spectrum analyzers usually provide local oscillators and intermediate frequency interfaces for external spectrum expansion, and high-frequency harmonic mixers can be connected externally to expand the measurement frequency of the spectrum analyzer. Keysight's PXA series spectrum analyzers provide a spread spectrum SMA interface, which is a local oscillator / intermediate frequency common interface. The output local oscillator signal and the input intermediate frequency signal are separated by the built-in duplexer of the spectrum analyzer. The spread spectrum SMA interface can output local oscillator signals in the range of 3.75 to 14.1GHz for spectrum expansion, and simultaneously receive the intermediate frequency signal of 322.5MHz output by the expansion component. This spectrum analyzer with a single expansion interface is suitable for frequency expansion in conjunction with a two-port harmonic mixer. The two-port mixer has only two physical interfaces, namely, an RF interface and a local oscillator / intermediate frequency common interface. When spreading the spectrum, this interface is connected to the spread spectrum SMA interface of the PXA. By setting the harmonic order of the spectrum analyzer and the loss caused by the spread spectrum component, the spectrum analyzer can display the frequency and power of the signal to be measured.
[0003] At present, the spectrum spreading devices provided by foreign manufacturers are all passive high-order harmonic mixing, which will result in large frequency conversion losses. As a result, after the signal enters the spectrum analyzer, the dynamic range will be small, the background noise will be raised, and the weak intermediate frequency signal will be invisible and buried. Moreover, it can only be used as spectrum spreading and has a single function. Utility Model Content
[0004] The utility model aims to provide a spectrum spreading and frequency conversion device which has multiple functions and effectively expands the applicable scope of the instrument.
[0005] The utility model is achieved in this way:
[0006] A spectrum spread spectrum frequency conversion device comprises a shell, in which a duplexer, a frequency multiplier and a mixer are installed, and a high-pass interface, a common interface, a low-pass interface, a frequency multiplication interface, an intermediate frequency interface and a radio frequency interface are respectively arranged on the shell, the high-pass end, the common end and the low-pass end of the duplexer are respectively connected to the high-pass interface, the common interface and the low-pass interface, the input end of the frequency multiplier is connected to the frequency multiplication interface, the output end of the frequency multiplier is connected to the LO end of the mixer, the RF end of the mixer is connected to the radio frequency interface, and the IF end of the mixer is connected to the intermediate frequency interface.
[0007] Furthermore, the high-pass frequency range of the duplexer is 6 GHz-12 GHz, and the low-pass frequency range is DC-5 GHz.
[0008] Furthermore, the frequency multiplier has a multiplication factor of 12.
[0009] Furthermore, the mixer is a double harmonic mixer.
[0010] Compared with the prior art, the beneficial effects of the utility model are:
[0011] In practical applications, in the spread spectrum mode, the public interface is connected to the spectrum analyzer, the high-pass interface is connected to the frequency multiplier interface through the LO jumper, the low-pass interface is connected to the intermediate frequency interface through the IF jumper, the LO signal is received through the public interface as the frequency multiplier excitation, the frequency multiplier transmits the LO signal to the mixer, the mixer receives the RF signal through the RF interface, the mixer mixes the received LO signal and the RF signal and outputs the IF signal and outputs it through the public interface to achieve spectrum spread; in the down-conversion mode, the LO signal is input through the frequency multiplier interface as the frequency multiplier excitation, the frequency multiplier transmits the LO signal to the mixer, the mixer The device receives an RF signal through a radio frequency interface, and the mixer mixes the received LO signal and the RF signal and then outputs an IF signal through an intermediate frequency interface to achieve down-conversion; in an up-conversion mode, an LO signal is input through a frequency multiplier interface as an excitation for the frequency multiplier, and the frequency multiplier transmits the LO signal to the mixer, and the frequency multiplier receives an IF signal through an intermediate frequency interface, and the mixer mixes the received LO signal and the IF signal and then outputs an RF signal through a radio frequency interface to achieve up-conversion; additional connection ports are provided through a duplexer, and the functions are diversified, which effectively expands the scope of application of the instrument; the utility model has diversified functions and effectively expands the scope of application of the instrument. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0013] Figure 1 It is a schematic diagram of the internal circuit structure of the utility model;
[0014] Figure 2 It is a front view of the structural schematic diagram of the utility model;
[0015] Figure 3 It is a rear view of the structural schematic diagram of the utility model;
[0016] Figure 4 It is a conversion loss curve diagram of the utility model;
[0017] Figure 5 yes Figure 1 Signal transmission path diagram in spread spectrum mode;
[0018] Figure 6 This is a spectrum spreading effect diagram of the utility model;
[0019] Figure 7 yes Figure 1 Signal transmission path diagram in up-conversion mode;
[0020] Figure 8 yes Figure 1 Signal transmission path diagram in down-conversion mode.
[0021] Reference numerals: housing 1; high-pass interface 2; common interface 3; low-pass interface 4; frequency multiplication interface 5; intermediate frequency interface 6; radio frequency interface 7. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.
[0023] See also Figures 1 to 8 A spectrum spread spectrum frequency conversion device comprises a shell 1, in which a duplexer, a frequency multiplier and a mixer are installed, and a high-pass interface 2, a common interface 3, a low-pass interface 4, a frequency multiplication interface 5, an intermediate frequency interface 6 and a radio frequency interface 7 are respectively arranged on the shell 1, the high-pass end, the common end and the low-pass end of the duplexer are respectively connected to the high-pass interface 2, the common interface 3 and the low-pass interface 4, the input end of the frequency multiplier is connected to the frequency multiplication interface 5, the output end of the frequency multiplier is connected to the LO end of the mixer, the RF end of the mixer is connected to the radio frequency interface 7, and the IF end of the mixer is connected to the intermediate frequency interface 6.
[0024] In practical applications, in the spread spectrum mode, the common interface 3 is connected to the spectrum analyzer, the high-pass interface 2 is connected to the frequency multiplier interface 5 through the LO jumper, the low-pass interface 4 is connected to the intermediate frequency interface 6 through the IF jumper, the LO signal is received through the common interface 3 as the frequency multiplier excitation, the frequency multiplier transmits the LO signal to the mixer, the mixer receives the RF signal through the radio frequency interface 7, the mixer mixes the received LO signal and the RF signal and outputs the IF signal and outputs it through the common interface 3 to achieve spectrum spread; in the down-conversion mode, the LO signal is input through the frequency multiplier interface 5 as the frequency multiplier excitation, the frequency multiplier transmits the LO signal to the mixer, The mixer receives the RF signal through the radio frequency interface 7, mixes the received LO signal and the RF signal, and then outputs the IF signal through the intermediate frequency interface 6 to achieve down-conversion; in the up-conversion mode, the LO signal is input through the frequency multiplier interface 5 as the frequency multiplier excitation, the frequency multiplier transmits the LO signal to the mixer, the frequency multiplier receives the IF signal through the intermediate frequency interface 6, mixes the received LO signal and the IF signal, and then outputs the RF signal through the radio frequency interface 7 to achieve up-conversion; the connection port is added by the duplexer, the function is diversified, and the application scope of the instrument is effectively expanded; the utility model has diversified functions and effectively expands the application scope of the instrument.
[0025] The high-pass frequency range of the duplexer is 6 GHz-20 GHz, and the low-pass frequency range is DC-5 GHz.
[0026] The frequency multiplier has a multiplication factor of 12.
[0027] The mixer is a double harmonic mixer.
[0028] See also Figure 4 The figure shows the test curve of the device's signal conversion loss for a fixed intermediate frequency of 322.5MHz. The test result of the conversion loss of the D-band 110GHz-170GHz is approximately equal to -16dB, and the conversion loss is small.
[0029] See also Figure 6 , the figure shows the spectrum spreading effect of the utility model on the D band 110GHz-170GHz.
[0030] The working principle of the utility model is: in the spread spectrum mode, the common interface 3 is connected to the spectrum analyzer, the high-pass interface 2 is connected to the frequency multiplication interface 5 through the LO jumper, the low-pass interface 4 is connected to the intermediate frequency interface 6 through the IF jumper, the LO signal is received through the common interface 3 as the frequency multiplier excitation, the frequency multiplier transmits the LO signal to the mixer, the mixer receives the RF signal through the radio frequency interface 7, the mixer mixes the received LO signal and the RF signal and outputs the IF signal and outputs it through the common interface 3 to realize spectrum spread;
[0031] In the down-conversion mode, the LO signal is input through the frequency multiplication interface 5 as the frequency multiplier excitation, the frequency multiplier transmits the LO signal to the mixer, the mixer receives the RF signal through the radio frequency interface 7, the mixer mixes the received LO signal and the RF signal and outputs the IF signal through the intermediate frequency interface 6 to achieve down-conversion;
[0032] In the up-conversion mode, the LO signal is input through the frequency multiplication interface 5 as the excitation of the frequency multiplier, the frequency multiplier transmits the LO signal to the mixer, the frequency multiplier receives the IF signal through the intermediate frequency interface 6, the mixer mixes the received LO signal and the IF signal, and outputs the RF signal through the radio frequency interface 7 to achieve up-conversion.
[0033] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A spectrum spreading and frequency conversion device, characterized in that: The invention comprises a shell (1), wherein a duplexer, a frequency multiplier and a mixer are installed in the shell (1); a high-pass interface (2), a common interface (3), a low-pass interface (4), a frequency multiplier interface (5), an intermediate frequency interface (6) and a radio frequency interface (7) are respectively arranged on the shell (1); the high-pass end, the common end and the low-pass end of the duplexer are respectively connected to the high-pass interface (2), the common interface (3) and the low-pass interface (4); the input end of the frequency multiplier is connected to the frequency multiplier interface (5); the output end of the frequency multiplier is connected to the LO end of the mixer; the RF end of the mixer is connected to the radio frequency interface (7); and the IF end of the mixer is connected to the intermediate frequency interface (6).
2. A spectrum spreading and frequency conversion device according to claim 1, characterized in that: The high-pass frequency range of the duplexer is 6 GHz-20 GHz, and the low-pass frequency range is DC-5 GHz.
3. A spectrum spreading and frequency conversion device according to claim 1, characterized in that: The frequency multiplier has a multiplication factor of 12.
4. A spectrum spreading and frequency conversion device according to claim 1, characterized in that: The mixer is a double harmonic mixer.