CN210490842U - Ultra-wideband fine stepping frequency synthesizer - Google Patents
Ultra-wideband fine stepping frequency synthesizer Download PDFInfo
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- CN210490842U CN210490842U CN201922203981.0U CN201922203981U CN210490842U CN 210490842 U CN210490842 U CN 210490842U CN 201922203981 U CN201922203981 U CN 201922203981U CN 210490842 U CN210490842 U CN 210490842U
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Abstract
The utility model discloses a fine step frequency synthesizer of ultra wide band, divide ware, harmonic generator, outer amplifier of ring, outer wave filter of ring, variable reference source, phase-locked loop A, phase-locked loop B including the merit, phase-locked loop A all includes phase discriminator, in-ring filter 1, frequency synthesizer, mixer, in-ring amplifier, in-ring filter 2 in proper order with phase-locked loop B circuit structure is the same. The utility model discloses a working bandwidth is 10MHz ~ 15GHz, has realized the frequency synthesis of ultra wide band to adopt brand-new phase-locked loop scheme, combine the power divider and harmonic generator to design two phase-locked loops that the circuit structure is the same, at first, utilize phase-locked loop B to convert the pectination spectral signal that harmonic generator produced into the frequency hopping signal that steps into 100MHz, insert phase-locked loop B to phase-locked loop A again, realized arbitrary marching ultra wide band low phase noise signal output; on the basis of the ultra-wideband of 10MHz-15GHz, the phase noise is better than-115 dBc/Hz @10kHz, and the technical index is improved compared with the prior ultra-wideband frequency synthesizer.
Description
Technical Field
The utility model relates to a signal frequency synthesis technique among the radio communication especially relates to a fine step frequency synthesizer of ultra wide band.
Background
The frequency synthesizer is one of the core components of the wireless transmission system, and with the continuous development of wireless communication, the frequency synthesizer has been developed more and more, and various types of frequency synthesizers have been formed, including phase-locked fractional frequency synthesizers, direct digital frequency synthesizers, hybrid frequency synthesizers, and the like. However, with the continuous development of mobile communication, wireless local area network, digital television, and satellite positioning system, the requirement for the frequency synthesizer is also continuously increased.
The existing ultra-wideband frequency synthesizer can reach the bandwidth of 10GHz, has very wide bandwidth, and can be widely applied to various communication fields. Although the existing ultra-wideband frequency synthesizer has a wide bandwidth, the key technical indexes of the existing ultra-wideband frequency synthesizer are relatively common, for example, the common phase noise of the frequency synthesizer with the bandwidth of more than 10GHz on the market is only better than-105 dBc/Hz @10kHz, and the application range of the existing ultra-wideband frequency synthesizer is limited by the relatively common technical indexes.
Disclosure of Invention
An object of the present invention is to provide an ultra-wideband fine step frequency synthesizer for solving the above problems.
The utility model discloses a following technical scheme realizes above-mentioned purpose:
an ultra-wideband fine step frequency synthesizer comprises a power divider, a harmonic generator, an out-of-loop amplifier, an out-of-loop filter, a variable reference source, a phase-locked loop A and a phase-locked loop B, wherein the phase-locked loop A and the phase-locked loop B have the same circuit structure and sequentially comprise a phase discriminator, an in-loop filter 1, a frequency synthesizer, a frequency mixer, an in-loop amplifier and an in-loop filter 2;
the power divider is a one-to-three power divider, a first output end of the power divider is connected with an input end of the variable reference source, the second output end of the power divider is connected with the phase discriminator of the phase-locked loop B, the third output end of the power divider is connected with the input end of the harmonic generator, the output end of the variable reference source is connected with the phase discriminator of the phase-locked loop A, the output end of the harmonic generator is connected with the mixer of the phase-locked loop B, the first output port of the frequency synthesizer of the phase-locked loop B is connected with the frequency mixer of the phase-locked loop A through an out-loop amplifier and an out-loop filter which are connected in sequence, the harmonic generator generates comb spectrum signals of 100MHz multiplied by N, a first output end of a frequency synthesizer of the phase-locked loop B outputs frequency hopping local oscillation signals of minimum stepping 100MHz, and the first output end of the frequency synthesizer of the phase-locked loop A is the output end of the frequency synthesizer.
Preferably, the model of the frequency synthesizer is LMX2594, and the first output end of the frequency synthesizer of the phase-locked loop B outputs a frequency-hopping local oscillator signal with a frequency of 7.5GHz-15GHz and a step of 100 MHz.
In particular, N is a natural number and the value range of N is more than or equal to 1 and less than or equal to 60.
The beneficial effects of the utility model reside in that:
1. the working bandwidth of the utility model is 10MHz-15GHz, which realizes the frequency synthesis of ultra wide band;
2. the utility model adopts a brand-new phase-locked loop scheme, combines the power divider and the harmonic generator to design two phase-locked loops with the same circuit structure, firstly utilizes the narrow-band filtering characteristic of the phase-locked loop B, converts the comb spectrum signal generated by the harmonic generator into a frequency hopping signal with the stepping of 100MHz, and then interpolates the phase-locked loop B into the phase-locked loop A, thereby realizing the output of the ultra-wideband low-phase noise signal with arbitrary stepping;
3. on the basis of the 10MHz-15GHz ultra-wideband, the achieved clutter suppression is more than or equal to 65dBc, the phase noise is better than-115 dBc/Hz @10kHz, and the technical index is improved compared with the existing ultra-wideband frequency synthesizer.
Drawings
Fig. 1 is a block diagram of the present invention.
Example 1
As shown in fig. 1, the ultra-wideband fine step-by-step frequency synthesizer includes a power divider, a harmonic generator, an out-of-loop amplifier, an out-of-loop filter, a variable reference source, a phase-locked loop a, and a phase-locked loop B, where the phase-locked loop a and the phase-locked loop B have the same circuit structure and sequentially include a phase discriminator, an in-loop filter 1, a frequency synthesizer, a mixer, an in-loop amplifier, and an in-loop filter 2.
The power divider is a one-to-three power divider, a first output end of the power divider is connected with an input end of a variable reference source, a second output end of the power divider is connected with a phase discriminator of a phase-locked loop B, a third output end of the power divider is connected with an input end of a harmonic generator, an output end of the variable reference source is connected with the phase discriminator of the phase-locked loop A, an output end of the harmonic generator is connected with a mixer of the phase-locked loop B, a first output end of a frequency synthesizer of the phase-locked loop B is connected with the mixer of the phase-locked loop A through an out-of-loop amplifier and an out-of-loop filter which are connected in sequence, the harmonic generator generates 100MHz xN comb spectrum signals, a first output end of the frequency synthesizer of the phase-locked loop B outputs frequency hopping local oscillator signals with the minimum step of 100 MHz.
Example 2
As shown in fig. 1, in the ultra-wideband fine step-by-step frequency synthesizer disclosed in this embodiment, the frequency synthesizers in the phase-locked loop a and the phase-locked loop B both use a frequency synthesizer of model LMX2594, which is a high performance frequency synthesizer manufactured by the company ti (texas instruments) in the united states, the operating frequency range of the frequency synthesizer can reach 10MHz-15GHz, and the phase noise at 10GHz is-106 dBc/Hz @10 kHz.
In the working process of the embodiment, an externally input 100MHz reference signal is divided into 3 strands of signals by a power divider and then respectively transmitted to a variable reference source, a phase-locked loop B and a harmonic generator, the harmonic generator generates a comb spectrum signal of 100MHz multiplied by N (N is a natural number), N is a natural number and is more than or equal to 1 and less than or equal to 60, namely the harmonic generator generates a comb spectrum signal of 100MHz-6 GHz. The variable reference source generates a signal with a frequency range of 300MHz-500MHz, and is stepped by 10kHz, and a direct digital frequency synthesizer with the model number AD9912 can be adopted as the variable reference source. The first output port of the frequency synthesizer of the phase-locked loop B outputs frequency hopping signals with the frequency range of 7.5GHz-15GHz and the minimum step of 100 MHz.
The frequency hopping signal is amplified and filtered by an out-of-loop amplifier and an out-of-loop filter, then is used as a local oscillation signal to carry out frequency mixing with a second output end output signal of a frequency synthesizer in the phase-locked loop A, the frequency mixing signal is subjected to filtering amplification in the phase-locked loop A and then is subjected to phase discrimination with a reference signal generated by a variable reference source, and finally a first output port of the frequency synthesizer of the phase-locked loop A outputs a 10MHz-15GHz randomly stepped synthetic signal.
The working bandwidth of the embodiment is 10MHz-15GHz, the stepping is 1Hz, the phase noise at the output frequency of 10GHz is better than-115 dBc/Hz @10kHz, the clutter rejection is more than or equal to 65dBc, and the ultra-wideband antenna has the characteristics of fine stepping and extremely.
Claims (4)
1. An ultra-wideband fine step frequency synthesizer is characterized in that: the phase-locked loop A and the phase-locked loop B have the same circuit structure and sequentially comprise a phase discriminator, an in-loop filter 1, a frequency synthesizer, a frequency mixer, an in-loop amplifier and an in-loop filter 2;
the power divider is a one-to-three power divider, a first output end of the power divider is connected with an input end of the variable reference source, the second output end of the power divider is connected with the phase discriminator of the phase-locked loop B, the third output end of the power divider is connected with the input end of the harmonic generator, the output end of the variable reference source is connected with the phase discriminator of the phase-locked loop A, the output end of the harmonic generator is connected with the mixer of the phase-locked loop B, the first output port of the frequency synthesizer of the phase-locked loop B is connected with the frequency mixer of the phase-locked loop A through an out-loop amplifier and an out-loop filter which are connected in sequence, the harmonic generator generates comb spectrum signals of 100MHz multiplied by N, a first output end of a frequency synthesizer of the phase-locked loop B outputs frequency hopping local oscillation signals with the minimum step of 100MHz, and the first output end of the frequency synthesizer of the phase-locked loop A is the output end of the frequency synthesizer.
2. The frequency synthesizer of claim 1, wherein: the frequency synthesizer is of the type LMX 2594.
3. Frequency synthesizer according to claim 1 or 2, characterized in that: n is a natural number and the value range of N is more than or equal to 1 and less than or equal to 60.
4. The frequency synthesizer of claim 2, wherein: and a first output end of the frequency synthesizer of the phase-locked loop B outputs a frequency hopping local oscillator signal with 7.5GHz-15GHz and 100MHz stepping.
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| CN201922203981.0U CN210490842U (en) | 2019-12-11 | 2019-12-11 | Ultra-wideband fine stepping frequency synthesizer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110739967A (en) * | 2019-12-11 | 2020-01-31 | 成都众志天成科技有限公司 | Ultra-wideband fine stepping frequency synthesizer |
| CN113422604A (en) * | 2021-08-24 | 2021-09-21 | 深圳市鼎阳科技股份有限公司 | Frequency synthesizer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110739967A (en) * | 2019-12-11 | 2020-01-31 | 成都众志天成科技有限公司 | Ultra-wideband fine stepping frequency synthesizer |
| CN113422604A (en) * | 2021-08-24 | 2021-09-21 | 深圳市鼎阳科技股份有限公司 | Frequency synthesizer |
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