Ultra-wideband extremely-small stepping frequency hopping frequency synthesizer module
By combining a DDS module, a frequency-shifting phase-locked loop circuit, and a frequency-division filtering circuit, the problems of frequency coverage, frequency hopping, and noise control in ultra-wideband transceiver systems are solved, resulting in a high-performance frequency synthesizer suitable for ultra-wideband transceiver systems.
Patent Information
- Application Number
- CN202520130577.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-01-20
AI Technical Summary
In existing ultra-wideband transceiver systems, it is difficult to simultaneously achieve frequency coverage, high-speed frequency hopping, low phase noise, low spurious emissions, and small step size, which limits system performance. Furthermore, common solutions are often bulky, costly, or have poor performance.
The system employs a DDS module circuit, an ultra-wideband frequency shift phase-locked loop circuit, a high-speed dot matrix circuit, and a wideband frequency divider filter circuit. The DDS module generates a high-resolution reference signal, the ultra-wideband frequency shift phase-locked loop circuit generates multiple dot frequency signals, the high-speed dot matrix circuit assists in mixing, and the wideband frequency divider filter circuit achieves segmented signal shifting and filtering, realizing extremely small step frequency hopping.
It achieves a wide frequency coverage of 1–18 GHz, extremely low frequency step, high-speed frequency hopping and low phase noise, significant spurious suppression effect, fast phase-locked time, and is suitable for ultra-wideband frequency synthesizers.
Smart Images
Figure CN223729745U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of radio transceiver, and particularly relates to an ultra-wideband extremely small step frequency hopping frequency synthesizer module. BACKGROUND
[0002] With the development of radio transceiver technology, an ultra-wideband transceiver system is more and more favored by people, which can cover a very wide frequency band, thereby replacing multiple narrowband transceiver systems, integrating multiple narrowband transceiver systems, greatly reducing the number of transceiver devices, and reducing the product volume and weight. The composite comprehensive wideband transceiver system, which is multi-purpose, can greatly reduce the manufacturing cost and is cost-effective. In the ultra-wideband transceiver system, an ultra-wideband frequency synthesizer is often needed to generate a local oscillator signal, thereby realizing the up-conversion and down-conversion of the transceiver system. The signal quality of the ultra-wideband local oscillator determines the signal quality of the entire transceiver system, and thus has a decisive influence on the performance of the transceiver system. In the ultra-wideband transceiver system, the local oscillator signal generally needs to have the characteristics of ultra-wideband frequency coverage, extremely low phase noise, small frequency step, low spurious and high-speed frequency hopping. In the development of frequency synthesis technology, the three indexes of ultra-wideband frequency coverage, high-speed frequency hopping and low phase noise cannot be considered simultaneously; and the two indexes of small step and low spurious are also difficult to consider simultaneously. Due to the wide frequency coverage range, the frequency span is too large when switching between high and low frequency bands, which inevitably causes the lock time to become longer. At the same time, due to the high output frequency, the frequency multiplication coefficient is large, thereby causing the phase noise to be not too good. In addition, to realize a small frequency step, step spurious is easily formed near the output frequency. The step frequency is much smaller than the loop bandwidth, and thus it is basically impossible to filter out through the loop, thereby forming stubborn and stable near-end spurious, which seriously affects the system performance.
[0003] In order to simultaneously consider the above indexes, technicians have adopted many methods, such as direct analog frequency synthesis, direct digital frequency synthesis, fractional phase-locked frequency synthesis and the like. However, the common methods often lead to a product with too large volume and high cost, which is not practical, or poor performance and cannot meet the use requirements. CONTENT OF THE NEW USEFUL MODEL
[0004] The application aims to solve the above problems, and provides an ultra-wideband extremely small step frequency hopping frequency synthesizer module.
[0005] The technical solution adopted by the application is as follows: an ultra-wideband extremely small step frequency hopping frequency synthesizer module, comprising a DDS module circuit, an ultra-wideband frequency shift phase-locked loop circuit, a high-speed dot matrix circuit and a wideband frequency division filter circuit.
[0006] The DDS module circuit generates a high-resolution reference signal of 50-110MHz as a reference input of the super wideband frequency-shifted phase-locked loop circuit. The output signal of the DDS module circuit is filtered as a reference of the wideband phase-locked loop source for phase-locked frequency multiplication.
[0007] The super wideband frequency-shifted phase-locked loop circuit outputs five point frequency signals from the high-speed dot array generation circuit, which are mixed with the main ring respectively to generate a lower intermediate frequency signal of 1000-2200MHz for frequency discrimination and phase discrimination to realize frequency-shifted phase discrimination.
[0008] The high-speed dot array circuit generates five independent point frequency signals through five independent phase-locked loop modules, with frequencies of 11200MHz, 12400MHz, 13600MHz, 14800MHz and 15800MHz respectively.
[0009] The wideband frequency division filter circuit performs program-controlled frequency division and filtering on the synthesized 9000-18000MHz signal.
[0010] In a preferred embodiment, the point frequency signals generated by the high-speed dot array circuit are output through a high-speed switch to assist in mixing the 9-18GHz super wideband frequency signal, segmenting and moving to the 1000-2200MHz frequency range, and realizing frequency-shifted phase discrimination.
[0011] In a preferred embodiment, the high-speed dot array circuit generates each phase-locked point frequency with a high phase discrimination frequency, and each point frequency is switched through a switch to realize high-speed frequency switching and convert the 9-18GHz signal to 1000-2200MHz.
[0012] In a preferred embodiment, the control signal output end of the super wideband frequency-shifted phase-locked loop circuit is connected with a DAC voltage preset circuit, the DAC voltage preset circuit outputs multiple preset voltage values, and is connected to the electric tuning port of the voltage-controlled oscillator (VCO).
[0013] In summary, due to the adoption of the above technical solutions, the application has the following advantages:
[0014] 1. In the application, the high-speed point frequency array divides the super wideband frequency of 9-18GHz into eight segments, which are moved and converted to 1000-2200MHz for frequency discrimination and phase discrimination, greatly reducing the phase discrimination frequency, thus achieving excellent phase noise and realizing super wideband frequency coverage.
[0015] 2. In the application, the high-speed point frequency phase-locked array not only has low phase noise and covers a large frequency span, but also has fast switching time through high-speed switches, which can realize large-range fast frequency hopping and provide strong support for improving the large-range frequency hopping time of the entire circuit system.
[0016] 3. In this application, DDS direct digital frequency synthesis circuit is adopted, near-end stray is low, and high frequency resolution is provided, which can realize extremely low frequency step. Moreover, the frequency hopping speed is very fast, reaching below 1uS, which is beneficial to realize fast frequency hopping of frequency synthesizer system.
[0017] 4. In this application, by adopting digital-to-analog conversion DAC voltage preset circuit, precise and fast voltage preset, precise preset of initial frequency of voltage controlled oscillator, the locking time of phase-locked circuit system is further accelerated. At the same time, it can prevent wrong locking.
[0018] 5. In this application, the final stage circuit realizes frequency coverage of full frequency band 1-18GHz through program-controlled frequency division and filter network, high frequency band is straight through, and different frequency division ratios are set according to segments in low frequency band. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 It is the synthesis schematic diagram of the ultra-wideband extremely small step frequency hopping frequency synthesizer module of this application;
[0020] Figure 2 It is the schematic diagram of high-speed dot matrix circuit in this application;
[0021] Figure 3 It is the schematic diagram of wideband frequency division filter circuit in this application;
[0022] Figure 4 It is the corresponding relationship diagram of point frequency, phase-locked frequency and synthesized frequency of high-speed dot matrix output in this application;
[0023] Figure 5 It is the relationship diagram of frequency division ratio selected by program-controlled frequency division circuit and final input and output frequency in this application. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical scheme and advantages of the embodiments of this application more clear, the technical scheme in the embodiments of this application will be described clearly and completely in combination with the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of this application.
[0025] Embodiment:
[0026] Reference Figures 1-5An ultra-wideband extremely small step frequency hopping frequency synthesizer module. It is realized by using DDS module circuit, ultra-wideband frequency shift phase-locked circuit, high-speed dot array circuit and wideband frequency division filter circuit. The main principle is that, with the help of high-speed dot array circuit, the ultra-wideband 9-18GHz wide frequency signal is moved to a lower intermediate frequency for frequency discrimination and phase discrimination, so that the frequency multiplication coefficient is small, the spurious and phase noise deterioration is less, and better phase noise and spurious indicators can be obtained. In addition, the output of the DDS module is filtered as a reference for the wideband phase-locked source. Since the output frequency resolution of the DDS is very high, it can reach the order of microhertz, so the phase-locked source can realize very small frequency steps.
[0027] Firstly, the product generates an output frequency range of 50-110MHz through a DDS direct digital frequency synthesis circuit module, and the frequency step can reach a small step signal below 1Hz. The DDS direct digital frequency synthesis circuit module not only has high output signal resolution, but also has very fast frequency hopping speed, reaching below 1uS. The output signal of the DDS module is used as the reference input of the ultra-wideband frequency shift phase-locked circuit.
[0028] The ultra-wideband frequency shift phase-locked circuit generates five dot frequency signals through the high-speed dot array generation circuit, which are mixed with the main ring respectively to generate a lower intermediate frequency signal of 1000-2200MHz for frequency discrimination and phase discrimination, so as to realize frequency shift and phase discrimination to obtain better phase noise. The frequency 50-110MHz output by the DDS module circuit is used as a reference, and the 1000-2200MHz signal obtained after mixing forms a phase-locked frequency multiplication relationship, and the frequency multiplication coefficient is 20, so the spurious and phase noise deterioration is less than about 26dB.
[0029] The digital-to-analog conversion DAC voltage presetting circuit generates multiple preset voltages, which are preset on the voltage-controlled oscillator electric tuning end according to frequency segmentation, used for fast frequency modulation, realizing fast locking and preventing wrong locking, so as to realize the requirement of high-speed frequency hopping in a large frequency band.
[0030] The high-speed dot array circuit generates five independent dot frequency signals through five independent phase-locked modules, with frequencies of 11200MHz, 12400MHz, 13600MHz, 14800MHz and 15800MHz respectively. These dot frequency signals are output through high-speed switch gating, which assists in realizing the mixing of 9-18GHz ultra-wide frequency signal, moving it to the frequency range of 1000-2200MHz in segments, and realizing frequency shift and phase discrimination. The high-speed dot array circuit generates high phase discrimination frequency for each phase-locked dot frequency, so that better phase noise can be obtained. In addition, the dot frequency can be switched by the switch to realize high-speed frequency conversion, and the 9-18GHz signal can be converted to 1000-2200MHz.
[0031] Therefore, the synthesized ultra-wideband 9000-18000MHz signal has excellent characteristics such as small step, high speed frequency hopping and low phase noise. The signal is further filtered by a wideband program-controlled frequency division, a switch filter network, and a filter to obtain the required 1-18GHz full-band signal, which further greatly expands the output frequency range of the synthesis.
[0032] The correspondence between the dot frequency of the high-speed dot array output, the phase-locked frequency and the synthesized frequency is as follows Figure 4 .
[0033] The relationship between the frequency division ratio selected by the program-controlled frequency division circuit and the final input and output frequency is as follows Figure 5 .
[0034] The ultra-wideband small-step frequency hopping synthesizer of the present application can obtain very excellent performance indicators. The use of ultra-wideband frequency shift phase-locked technology and wideband frequency division filtering technology makes the synthesized frequency bandwidth of the product very wide, reaching 1-18GHz.
[0035] Since the loop of the phase-locked frequency source can suppress spurs, the spurs of the product are mainly near-end step spurs and DDS near-end spurs. The step spurs are mainly caused by signal frequency space leakage and through power supply crosstalk, and other near-end spurs are mainly inherent spurs of the DDS output, which are then worsened by phase-locked frequency multiplication. Since the product uses frequency shift phase-locked, the phase detection operating frequency is low and the frequency multiplication coefficient is small, so the worsening is not much, about 26dB. The near-end spurs of the signal output by the DDS module are very good, which can reach below -96dBc, so the final near-end spurs can reach below -70dBc. In addition, an advanced digital-to-analog conversion DAC voltage preset circuit is used to quickly preset the voltage-controlled oscillator near the locked frequency, so as to achieve fast locking. Therefore, the product can finally achieve the following indicators.
[0036] ①Output frequency range: 1-18GHz;
[0037] ③Step: ≤10KHz;
[0038] ④Frequency hopping time: ≤50us;
[0039] ⑤Phase noise: ≤-105dBc / Hz@10KHz(10GHz);
[0040] ⑥Spur suppression: ≤-70dBc.
[0041] From the above, it can be seen that:
[0042] In the present application, the high-speed dot array divides the ultra-wideband frequency 9-18GHz signal into 8 segments, and shifts and converts them to 1000-2200MHz for frequency detection and phase detection, greatly reducing the phase detection frequency, so as to obtain excellent phase noise and realize ultra-wideband frequency coverage.
[0043] In the application, the high-speed point frequency phase-locked array not only has low self-phase noise and large frequency span, but also has fast switching time through high-speed switch, so that large-range fast frequency hopping can be realized, which provides strong support for improving the large-range frequency hopping time of the entire circuit system.
[0044] In the application, the DDS direct digital frequency synthesis circuit is adopted, which has low near-end spur and provides high frequency resolution, so that extremely low frequency stepping can be realized. Moreover, the frequency hopping speed is very fast, reaching below 1uS, which is beneficial to realize fast frequency hopping of the frequency synthesis system.
[0045] In the application, the digital-to-analog conversion DAC voltage preset circuit is adopted to accurately and quickly preset the voltage and accurately preset the initial frequency of the voltage-controlled oscillator, so that the locking time of the phase-locked circuit system is further accelerated. At the same time, false locking can be prevented.
[0046] In the application, the final stage circuit realizes frequency coverage of 1-18GHz through program-controlled frequency division and filter network. In the high-frequency segment, the signal is directly transmitted, and in the low-frequency segment, different frequency division ratios are set according to the segment.
[0047] The above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.
Claims
1. An ultra-wideband minimal step frequency hopping frequency synthesizer module, characterized by: Comprise: DDS module circuit, ultra-wideband frequency shift phase-locked loop circuit, high-speed dot matrix circuit and wideband frequency division filter circuit; The DDS module circuit generates a high-resolution reference signal of 50-110MHz, which is used as the reference input of the ultra-wideband frequency shift phase-locked loop circuit. The output signal of the DDS module circuit is filtered by a band-pass filter and used as the reference of the wideband phase-locked loop source for phase-locked frequency multiplication. The ultra-wideband frequency shift phase-locked loop circuit outputs five dot frequency signals from the high-speed dot matrix generation circuit, which are mixed with the main ring respectively to generate a lower intermediate frequency signal of 1000-2200MHz for frequency and phase discrimination, realizing frequency shift phase discrimination. The high-speed dot matrix circuit generates five independent dot frequency signals through five independent phase-locked loop modules, with frequencies of 11200MHz, 12400MHz, 13600MHz, 14800MHz and 15800MHz respectively. The wideband frequency division filter circuit performs program-controlled frequency division and filtering on the synthesized 9000-18000MHz signal.
2. An ultra- wideband very small stepping frequency hopping radio module as claimed in claim 1, characterized in that: The dot frequency signals generated by the high-speed dot matrix circuit are output through high-speed switch gating, which helps to realize the mixing of 9-18GHz ultra-wide frequency signals, the segmented moving to the frequency range of 1000-2200MHz, and the realization of frequency shift phase discrimination.
3. An ultra- wideband microminiature stepping frequency-hopping frequency synthesizer module as recited in claim 1, further characterized by: The high-speed dot matrix circuit generates dot frequency signals with high phase discrimination frequency. The dot frequencies are switched by switches to realize high-speed frequency conversion, which converts the 9-18GHz signal to 1000-2200MHz.
4. The ultra-wideband minimal step frequency hopping synthesizer module as described in claim 1, characterized in that: The control signal output end of the ultra-wideband frequency shift phase-locked loop circuit is connected with a DAC voltage preset circuit, which outputs multiple preset voltage values and is connected to the electric tuning port of the voltage-controlled oscillator.