CN217037164U - Ultralow phase noise local vibration source - Google Patents
Ultralow phase noise local vibration source Download PDFInfo
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- CN217037164U CN217037164U CN202220853020.3U CN202220853020U CN217037164U CN 217037164 U CN217037164 U CN 217037164U CN 202220853020 U CN202220853020 U CN 202220853020U CN 217037164 U CN217037164 U CN 217037164U
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Abstract
The utility model discloses an ultralow phase noise local oscillation source which comprises a crystal oscillator, wherein a signal output by the crystal oscillator is divided into at least A, B paths through a first power divider, wherein the path A is connected with the input end of a first frequency doubling unit; the path B is connected with the input end of the second frequency doubling unit; and the output end of the second mixer outputs the local oscillator signal through the third switch filtering component and the output frequency doubling unit in sequence. The method and the device adopt the latest high-speed DDS technology to realize the ultra-small stepping and narrow-band low-spurious performance which is less than 1Hz, and generate the frequency hopping low local oscillation signal with small stepping, low phase noise and low spurious.
Description
Technical Field
The utility model relates to the technical field of frequency synthesis and digital phase-locked synthesis, in particular to an ultralow phase noise local oscillator.
Background
With the development of radio technology, especially in modern complex electromagnetic environment, frequency synthesizer needs to be designed with frequency agility and low phase noise to improve the signal interception capability and dynamic range of the receiver.
The frequency synthesizer used in the prior art mainly comprises a frequency divider, a digital phase discriminator, a loop filter, a voltage-controlled oscillator and the like, and because the noise floor of the frequency divider, the active digital phase discriminator and other devices is high, the mass production is limited due to the characteristics of high cost, narrow bandwidth of phase-locked frequency, large volume and large frequency stepping, and simultaneously, the agility, the broadband and the low phase noise can not be obtained in many applications.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an ultralow phase noise local oscillation source, wherein one path of signal output by a crystal oscillator is input as a reference clock signal of a DDS; and the other path of signal is input as a local oscillation signal of the frequency mixer, is mixed with an output signal of the DDS circuit, and is output through the frequency doubling filter circuit. The method is used for solving the problem that the existing agility, broadband and low phase noise can not be combined.
An ultra-low phase noise local oscillation source comprises a crystal oscillator, wherein a signal output by the crystal oscillator is divided into at least A, B paths by a first power divider,
the path A is connected with the input end of a first frequency doubling unit, the output end of the first frequency doubling unit is connected with the radio frequency end of a first mixer, and the output end of the first mixer is connected with the local oscillator end of a second mixer through a second switch filtering component;
the path B is connected with an input end of a second frequency doubling unit, an output signal of the second frequency doubling unit is divided into at least one LO path through a second power divider, the LO path of the second power divider is connected with a third frequency doubling unit, an output signal of the third frequency doubling unit is divided into D, E paths through a third power divider, a path D of the third power divider is connected with a local oscillation end of a first mixer, and a path E of the third power divider is connected with a radio frequency end of a second mixer through a DDS;
and the output end of the second frequency mixer outputs the local oscillator signal through the third switch filtering component and the output frequency doubling unit in sequence.
Furthermore, the first frequency doubling unit comprises a first amplifier, a comb spectrum generator and a first switch filtering component, and the path a of the first power divider is connected to the radio frequency end of the first mixer through sequentially connecting the first amplifier, the comb spectrum generator and the first switch filtering component.
Furthermore, the second frequency multiplier unit comprises a second amplifier, a second frequency multiplier and a second filter, and the path B of the first power divider is connected with the second power divider through the second amplifier, the second frequency multiplier and the second filter which are connected in sequence.
Further, the first power divider is a divide-by-three power divider, the signal output by the crystal oscillator is divided into A, B, C paths by the first power divider, and the path C of the first power divider outputs the reference clock signal REF _1 through a C1 amplifier and a C1 filter which are connected in sequence.
Further, the second power divider is a one-to-six power divider, the output signal of the second frequency doubling unit is divided into six paths by the second power divider, and five paths of the second power divider are respectively used for outputting reference clock signals REF _2, REF _3, REF _4, REF _5 and REF _6 after amplification and filtering.
Further, the third frequency doubling unit includes a third amplifier, a third frequency doubler and a third filter, and the LO circuit of the second power divider is connected to the third power divider through the third amplifier, the third frequency doubler and the third filter, which are connected in sequence.
Further, the output frequency doubling unit comprises an output amplifier, an output frequency doubler and an output filter, and the output signal of the third switch filtering component outputs the local oscillator signal through the output amplifier, the output frequency doubler and the output filter which are connected in sequence.
The utility model has the following beneficial effects:
the direct digital frequency synthesis of the utility model has the characteristics of low phase noise, frequency agility, fine stepping and the like. The direct digital frequency synthesis is adopted as a reference, so that the whole loop has the characteristics of low phase noise, frequency agility, fine stepping and the like.
In the application, the output REF _1 signal output phase noise is less than or equal to-162 dBc/Hz @1 kHz; or less than or equal to-165 dBc/Hz @6kHz, and the phase noise of output REF _ 2-REF _6 signals is less than or equal to-138 dBc/Hz @1 kHz; or less than or equal to-143 dBc/Hz @6kHz, and the output phase noise of the output local oscillation signal is less than or equal to-120 dBc/Hz @1 kHz; or less than or equal to-123 dBc/Hz @6 kHz.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a schematic structural view of the present invention;
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "open," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Example 1
An ultra-low phase noise local oscillation source comprises a crystal oscillator, wherein a signal output by the crystal oscillator is divided into at least A, B paths by a first power divider,
the path A is connected with the input end of a first frequency doubling unit, the output end of the first frequency doubling unit is connected with the radio frequency end of a first frequency mixer, and the output end of the first frequency mixer is connected with the local oscillator end of a second frequency mixer through a second switch filtering component;
the path B is connected to an input end of a second frequency doubling unit, an output signal of the second frequency doubling unit is divided into at least one LO path by a second power divider, the LO path of the second power divider is connected to a third frequency doubling unit, an output signal of the third frequency doubling unit is divided into D, E paths by a third power divider, a path D of the third power divider is connected to a local oscillator end of a first mixer, and a path E of the third power divider is connected to a radio frequency end of a second mixer by a DDS;
and the output end of the second mixer outputs a local oscillator signal through the third switch filtering component and the output frequency doubling unit in sequence.
The reference signal generated by the crystal oscillator is divided into two paths A and B by the first power divider, wherein the path A is provided for the first frequency doubling unit for low-noise comb spectrum frequency doubling and outputting a first intermediate-frequency signal to the first mixer, the other path is provided for the second frequency doubling unit for frequency doubling and filtering, the output signal of the second frequency doubling unit is divided into two paths by the second power divider, one path is provided for the amplifying and filtering circuit and outputs a reference signal REF2-6, and the other path is provided for the third frequency doubling unit for frequency doubling and filtering. The first frequency doubling unit generates a harmonic signal under the action of the A-path reference excitation, and the harmonic signal generates an intermediate frequency signal U through the first switching filter component and is connected to the first mixer. The third frequency doubling unit carries out frequency doubling filtering on the output signal subjected to frequency doubling filtering by the second frequency doubling unit again to generate an output signal Q, the output signal Q generated by the third frequency doubling unit is divided into two paths by a third power divider, one path is used as a third reference excitation signal and is provided for the DDS, and the other path is used as a local oscillation signal I and is connected to the first mixer.
The DDS generates an intermediate frequency signal W under the action of the reference excitation signal and is connected to the radio frequency end of the second frequency mixer, the signal obtained by mixing the intermediate frequency signal U and the local oscillation signal I through the first frequency mixer outputs a local oscillation reference signal R through the second switch filter component and is connected to the local oscillation end of the second frequency mixer, and the second frequency mixer mixes the intermediate frequency signal W and the local oscillation reference signal R. And the signal mixed by the second mixer is input to the input end of a fourth frequency multiplication unit through a third switch filter component, and the output of the fourth frequency multiplication unit meets the standard local oscillator signal.
Example 2
On the basis of embodiment 1, the first frequency doubling unit includes a first amplifier, a comb spectrum generator, and a first switch filter component, and the path a of the first power divider is connected to the radio frequency end of the first mixer by sequentially connecting the first amplifier, the comb spectrum generator, and the first switch filter component.
Specifically, the second frequency doubling unit includes a second amplifier, a second frequency doubler and a second filter, and the path B of the first power divider is connected to the second power divider through the second amplifier, the second frequency doubler and the second filter, which are connected in sequence.
Specifically, the first power divider is a one-to-three power divider, the signal output by the crystal oscillator is divided into A, B, C paths by the first power divider, and the path C of the first power divider outputs the reference clock signal REF _1 through a C1 amplifier and a C1 filter which are connected in sequence.
Specifically, the second power divider is a one-to-six power divider, the output signal of the second frequency doubling unit is divided into six paths by the second power divider, and five paths of the second power divider are respectively used for outputting reference clock signals REF _2, REF _3, REF _4, REF _5, and REF _6 after amplification and filtering.
Specifically, the third frequency doubling unit includes a third amplifier, a third frequency doubler and a third filter, and the LO circuit of the second power divider is connected to the third power divider through the third amplifier, the third frequency doubler and the third filter, which are connected in sequence.
Specifically, the output frequency doubling unit comprises an output amplifier, an output frequency doubler and an output filter, and the output signal of the third switch filtering component outputs the local oscillator signal through the output amplifier, the output frequency doubler and the output filter which are connected in sequence.
This application adopts the super small step-by-step and the low spurious performance of narrowband that newest high-speed DDS technique realized, through producing little step-by-step, the low phase is made an uproar, the low local oscillator signal of low spurious frequency hopping, the high local oscillator signal of low phase noise is produced to application low noise comb spectrum doubling of frequency technique, application switch filtering technique effectively reduces the broadband spurious, the production of application numerical control frequency division technique completion low frequency band signal, finally realize the ultra wide band frequency and cover, consequently, the frequency source of this application can realize the ultra wide band, the low phase is made an uproar, low spurious, little step-by-step, small-size and low cost, especially adapted use in arbitrary one system higher to the performance requirement as a universalization module. Meanwhile, the frequency synthesis scheme involved in the frequency source is elaborately designed, so that the performance and index of the whole frequency source achieve the optimal effect.
The foregoing is only a preferred embodiment of the present invention, and the present invention is not limited thereto in any way, and any simple modification, equivalent replacement and improvement made to the above embodiment within the spirit and principle of the present invention still fall within the protection scope of the present invention.
Claims (7)
1. An ultralow phase noise local oscillation source comprises a crystal oscillator and is characterized in that: the signal output by the crystal oscillator is divided into at least A, B paths by a first power divider, wherein,
the path A is connected with the input end of a first frequency doubling unit, the output end of the first frequency doubling unit is connected with the radio frequency end of a first mixer, and the output end of the first mixer is connected with the local oscillator end of a second mixer through a second switch filtering component;
the path B is connected with an input end of a second frequency doubling unit, an output signal of the second frequency doubling unit is divided into at least one LO path through a second power divider, the LO path of the second power divider is connected with a third frequency doubling unit, an output signal of the third frequency doubling unit is divided into D, E paths through a third power divider, a path D of the third power divider is connected with a local oscillation end of a first mixer, and a path E of the third power divider is connected with a radio frequency end of a second mixer through a DDS;
and the output end of the second frequency mixer outputs the local oscillator signal through the third switch filtering component and the output frequency doubling unit in sequence.
2. The ultra-low phase noise local oscillator according to claim 1, wherein the first frequency multiplier unit comprises a first amplifier, a comb spectrum generator and a first switch filter component, and the path a of the first power divider is connected to the rf end of the first mixer by sequentially connecting the first amplifier, the comb spectrum generator and the first switch filter component.
3. The ultra-low phase noise local oscillator according to claim 1, wherein the second frequency multiplier comprises a second amplifier, a second frequency multiplier and a second filter, and the B-path of the first power divider is connected to the second power divider through the second amplifier, the second frequency multiplier and the second filter which are connected in sequence.
4. The ultra-low phase noise source of claim 1, wherein the first power divider is a one-to-three power divider, the signal outputted from the crystal oscillator is divided into A, B, C three paths by the first power divider, and the path C of the first power divider outputs the reference clock signal REF _1 through a C1 amplifier and a C1 filter which are connected in sequence.
5. The ultra-low phase noise source of claim 1, wherein the second power divider is a six-way power divider, the output signal of the second frequency multiplier unit is divided into six ways by the second power divider, and five ways of the second power divider are respectively used for outputting the reference clock signals REF _2, REF _3, REF _4, REF _5, and REF _6 after being amplified and filtered.
6. The ultra-low phase noise local oscillation source of claim 1, wherein the third frequency multiplication unit comprises a third amplifier, a third frequency multiplier and a third filter, and the LO circuit of the second power divider is connected to the third power divider through the third amplifier, the third frequency multiplier and the third filter which are connected in sequence.
7. The ultra-low phase noise local oscillation source according to claim 1, wherein the output frequency doubling unit comprises an output amplifier, an output frequency doubler and an output filter, and the output signal of the third switch filter assembly outputs the local oscillation signal through the output amplifier, the output frequency doubler and the output filter which are connected in sequence.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220853020.3U CN217037164U (en) | 2022-04-11 | 2022-04-11 | Ultralow phase noise local vibration source |
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| CN202220853020.3U CN217037164U (en) | 2022-04-11 | 2022-04-11 | Ultralow phase noise local vibration source |
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