A low power low spurious integrated assembly

Abstract

The application provides a low-power low-stray frequency synthesizer assembly, which comprises a reference signal processing unit, a frequency synthesis unit and a power division switch unit, the reference signal processing unit receives a reference signal and inputs the reference signal as a reference signal of the frequency synthesis unit, a matching load and a reference output respectively, the frequency synthesis unit comprises a plurality of frequency hopping sources and a plurality of point frequency sources, and the reference signal is output after being processed by the frequency synthesis unit, and the power division switch unit receives the output signal of the frequency synthesis unit, and outputs multiple paths after power division and switching. The frequency synthesizer assembly provided by the application has low power consumption, small size and can effectively suppress stray.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and more specifically to a low-power, low-spurious-frequency synthesizer. Background Technology

[0002] With the continuous development of electronic technology, the new generation of electronic systems has put forward a series of requirements for frequency synthesizer components, such as ultra-wideband, miniaturization, low power consumption, and low spurious emissions.

[0003] In addition, for existing phase-locked frequency synthesis units, when Fo and Fr are not integer multiples of each other, due to the intermodulation between the RFVCO frequency and the reference frequency, spurious sidebands will appear on the VCO output spectrum with a certain offset frequency.

[0004] The aforementioned spurious signals can usually be attenuated to a great extent by the loop filter. However, when the frequency is close to an integer multiple of the reference frequency, especially when the frequency interval between these spurious signals and the output signal is less than the loop bandwidth of the loop filter, the loop filter becomes powerless, resulting in spurious signal suppression of less than 40dBc.

[0005] For frequency synthesizers with smaller step sizes, such as below 10kHz or even smaller, integer boundary spurious noise has a very serious impact on the system, and can even cause the entire system to malfunction. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a low-power, low-spurious frequency synthesizer component, which solves the technical problems of high power consumption and significant spurious influence of existing frequency synthesizer components.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A low-power, low-spurious-frequency synthesizer includes a reference signal processing unit, a frequency synthesis unit, and a power divider switching unit, wherein:

[0009] The reference signal processing unit receives the reference signal and uses the reference signal as the reference signal, the matched load input, and the reference output of the frequency synthesis unit, respectively.

[0010] The frequency synthesis unit includes multiple frequency hopping sources and multiple point frequency sources. The reference signal is processed by the frequency synthesis unit and then output to the power divider unit.

[0011] The power divider switch unit receives the output signal from the frequency synthesizer unit, and after power division and switching, outputs multiple channels.

[0012] Furthermore, the number of frequency hopping sources is four; it also includes a first external local oscillator and a second external local oscillator originating from external sources.

[0013] Furthermore, the point frequency source is a point frequency source with two selectable frequencies: 3600MHz and 3602MHz.

[0014] Furthermore, the number of point frequency sources is two, and the reference signal is amplified and power-divided into two outputs after being processed by the point frequency sources.

[0015] The supply voltage of each frequency hopping source and each point frequency source is 3.3V, and the supply current is ≤100mA.

[0016] Furthermore, the frequency synthesizer is provided with spacers and cover plates between each local oscillator signal and between internal signals and external signals.

[0017] Furthermore, the frequency synthesizer is made of RO4350B board and FR4 board through multi-layer mixed pressing, with a volume not exceeding 150mm×120mm×5.5mm; the volume of each frequency hopping source and each point frequency source does not exceed 15mm×12mm×2.5mm.

[0018] Furthermore, the frequency range of the frequency hopping source is 3800MHz to 5800MHz; the frequency hopping time is ≤30μs; the phase noise at 5800MHz is ≤-95dBc / Hz@1kHz; the spurious suppression is ≥60dBc; and the frequency step is 10Hz.

[0019] Furthermore, the frequency hopping time of the point frequency source is ≤30μs; the phase noise at 3602MHz is ≤

[0020] -100dBc / Hz@1kHz; spurious rejection ≥65dBc.

[0021] Furthermore, the isolation between the frequency hopping source and the point frequency source is ≥70dB.

[0022] Furthermore, the frequency range of the first and second external local oscillators is 4500MHz to 5000MHz; the frequency hopping time is ≤1μs; the spurious suppression is ≥65dBc; and the frequency step is 1MHz.

[0023] Based on the above technical solution, the low-power, low-spurious frequency synthesizer provided by the present invention can produce the following technical effects:

[0024] (1) The frequency synthesis component provided by the present invention has multiple channels and the signal synchronization between channels is high, which can meet the requirements of existing radars;

[0025] (2) The frequency synthesizer of the present invention and its internal components have a small volume, which can meet the miniaturization requirements of the existing market;

[0026] (3) The frequency hopping source and point frequency source settings of the present invention enable the frequency synthesizer to have low power consumption and good spurious suppression effect. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 This is a diagram of the intermediate frequency synthesizer architecture of the present invention;

[0029] Figure 2 This is a schematic diagram of the point frequency source in this invention;

[0030] Figure 3 This is a schematic diagram of the spacer bar and cover plate of the frequency synthesizer component of the present invention. Detailed Implementation

[0031] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1:

[0034] This embodiment provides a low-power, low-spurious frequency synthesizer component, such as... Figure 1 As shown, it includes a reference signal processing unit, a frequency synthesis unit, and a power divider unit, wherein:

[0035] The reference signal processing unit receives a reference signal, which is 100MHz. The reference signal processing unit uses the reference signal as the reference signal of the frequency synthesis unit, the input of the matched load, and the 100MHz reference output, respectively.

[0036] The frequency synthesis unit includes multiple frequency hopping sources and multiple point frequency sources, and each frequency source processes the reference signal and outputs it.

[0037] The power divider switch unit receives the output signal from the frequency synthesizer unit, and after power division and switching, outputs multiple channels.

[0038] Furthermore, in this embodiment, the number of frequency hopping sources is four, namely frequency hopping source 11, frequency hopping source 12, frequency hopping source 13 and frequency hopping source 14.

[0039] In this embodiment, it includes a first external local oscillator 1 and a second external local oscillator 2, such as Figure 1 As shown, the first external local oscillator 1, frequency hopping source 11, and frequency hopping source 12 output two paths, LO11 and LO12, after passing through the power divider unit; the second external local oscillator 2, frequency hopping source 13, and frequency hopping source 14 output two paths, LO13 and LO14, after passing through the power divider unit; among them, LO11 and LO12 can be selected from frequency hopping source 11, frequency hopping source 12, or the first external local oscillator 1; LO13 and LO14 can be selected from frequency hopping source 13, frequency hopping source 14, or the second external local oscillator 2.

[0040] In this embodiment, the point frequency source is point frequency source 21 and point frequency source 23 with two selectable frequencies of 3600MHz and 3602MHz; the output frequencies of LO21, LO22, LO23, and LO24 can be configured to 3600MHz or 3602MHz.

[0041] like Figure 2 As shown, both LO1 and LO2 reference sources are selected as 100MHz. To avoid the influence of integer boundary spurious emissions, when the LO1 frequency is (3800±2)MHz, (3900±2)MHz, ..., (5700±2)MHz, (5800±2)MHz, the LO1 frequency needs to be increased by 2MHz to become (3802±2)MHz, (3902±2)MHz, ..., (5702±2)MHz, (5802±2)MHz. At this time, IF1 becomes 3672MHz. In order to ensure that IF2 is still 70MHz, the LO2 frequency becomes 3602MHz. In this way, the low suppression of integer boundary spurious emissions caused by the LO1 output frequency being distributed around an integer multiple of 100MHz ±2MHz can be avoided.

[0042] In this embodiment, the frequency synthesizer is made of RO4350B and FR4 boards through multi-layer mixed pressing, with a volume of 130mm×110mm×5mm; each frequency hopping source and each point frequency source has a volume of 15mm×12mm×2.5mm, a power supply voltage of 3.3V, and a current of ≤100mA, ultimately realizing 4 channels of frequency hopping local oscillator signals and 4 channels of point frequency signals, with the entire module power consumption as low as 3.5W.

[0043] In this embodiment, the frequency hopping source is:

[0044] The frequency range is 3800MHz~5800MHz, the frequency hopping time is ≤30μs; the phase noise at 5800MHz is ≤-95dBc / Hz@1kHz; the spurious rejection is ≥60dBc; and the frequency step is 10Hz.

[0045] In this embodiment, the point frequency source is:

[0046] Frequency hopping time ≤30μs; 3602MHz phase noise ≤-100dBc / Hz@1kHz; spurious rejection ≥65dBc.

[0047] In this embodiment, the first external local oscillator and the second external local oscillator are:

[0048] Frequency range: 4500MHz~5000MHz; Frequency hopping time: ≤1μs; Spurious emission suppression: ≥65dBc;

[0049] The frequency step is 1MHz.

[0050] In this embodiment, the isolation between the frequency hopping source and the point frequency source is ≥70dB.

[0051] In this embodiment, the frequency synthesizer component is provided with spacers and cover plates between each local oscillator signal and between internal signals and external signals, such as... Figure 3 As shown, this can avoid mutual interference between signals.

[0052] The structures, functions, and connection forms disclosed herein can be implemented in other ways. For example, the embodiments described above are merely illustrative, and other installation methods may exist, such as multiple components being combined or integrated into another component; furthermore, the functional components in the various embodiments herein may be integrated into one functional component, or each functional component may exist physically separately, or two or more functional components may be integrated into one functional component.

[0053] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A low-power, low-spurious frequency synthesizer, characterized in that: It includes a reference signal processing unit, a frequency synthesis unit, and a power divider unit, wherein: The reference signal processing unit receives the reference signal and uses the reference signal as the reference signal, the matched load input, and the reference output of the frequency synthesis unit, respectively. The frequency synthesis unit includes multiple frequency hopping sources and multiple point frequency sources. The reference signal is processed by the frequency synthesis unit and then output to the power divider unit. The power divider switch unit receives the output signal from the frequency synthesizer unit, and after power division and switching, outputs multiple channels; The frequency hopping source is four in number; it also includes a first external local oscillator and a second external local oscillator; The supply voltage of each frequency hopping source and each point frequency source is 3.3V, and the supply current is ≤100mA; The frequency synthesizer is equipped with spacers and covers between each local oscillator signal and between internal and external signals. The frequency synthesizer is made of RO4350B and FR4 boards through multi-layer mixed pressing, with a volume not exceeding 150mm×120mm×5.5mm; the volume of each frequency hopping source and each point frequency source does not exceed 15mm×12mm×2.5mm. The isolation between the frequency hopping source and the point frequency source is ≥70dB; The number of frequency hopping sources is four, namely frequency hopping source 11, frequency hopping source 12, frequency hopping source 13 and frequency hopping source 14; The first external local oscillator (1), frequency hopping source 11, and frequency hopping source 12 output two paths, L011 and L012, after passing through the power divider unit; the second external local oscillator (2), frequency hopping source 13, and frequency hopping source 14 output two paths, L013 and L014, after passing through the power divider unit; among them, L011 and L012 can be selected from frequency hopping source 11, frequency hopping source 12, or the first external local oscillator (1); L013 and L014 can be selected from frequency hopping source 13, frequency hopping source 14, or the second external local oscillator (2).

2. The low-power, low-spurious frequency synthesizer according to claim 1, characterized in that: The frequency source is a selectable frequency source with two frequencies: 3600MHz and 3602MHz; the frequency hopping time of the frequency source is ≤30μs; the phase noise of the 3602MHz frequency source is ≤-100dBc / Hz@1kHz; and the spurious suppression is ≥65dBc.

3. The low-power, low-spurious frequency synthesizer according to claim 1, characterized in that: The number of point frequency sources is two. The reference signal is amplified and power divided into two outputs after being processed by the point frequency sources.

4. The low-power, low-spurious frequency synthesizer according to claim 1, characterized in that: The frequency range of the frequency hopping source is 3800MHz~5800MHz; the frequency hopping time is ≤30μs; the phase noise at 5800MHz is ≤-95dBc / Hz@1kHz; the spurious rejection is ≥60dBc; and the frequency step is 10Hz.

5. A low-power, low-spurious frequency synthesizer according to claim 1, characterized in that: The frequency range of the first and second external local oscillators is 4500MHz to 5000MHz; the frequency hopping time is ≤1μs; the spurious suppression is ≥65dBc; and the frequency step is 1MHz.

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