CN208226999U - A kind of radio-frequency unit - Google Patents
A kind of radio-frequency unit Download PDFInfo
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- CN208226999U CN208226999U CN201820561887.5U CN201820561887U CN208226999U CN 208226999 U CN208226999 U CN 208226999U CN 201820561887 U CN201820561887 U CN 201820561887U CN 208226999 U CN208226999 U CN 208226999U
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- Prior art keywords
- radio
- spdt
- throw switch
- pole double
- amplifier
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Abstract
The utility model belongs to radio frequency arts, discloses a kind of radio-frequency unit, is applied to radio-frequency channel circuit, the radio-frequency unit includes: the first single-pole double-throw switch (SPDT), the second single-pole double-throw switch (SPDT), amplifier and numerical-control attenuator；RF signal input end of the moved end of first single-pole double-throw switch (SPDT) as radio-frequency unit, two non-moving ends are separately connected the input terminal of amplifier and the input terminal of numerical-control attenuator；The output end of amplifier connects a non-moving end of the second single-pole double-throw switch (SPDT), and the output end of numerical-control attenuator connects another non-moving end of the second single-pole double-throw switch (SPDT), RF signal output of the moved end of the second single-pole double-throw switch (SPDT) as radio-frequency unit.The utility model can overcome the output noise power that numerical-control attenuator is caused with amplifier cascade in existing radio-frequency channel circuit big, be unable to satisfy the deficiency for generating small signal, can be effectively reduced output noise power, increase the dynamic range of output signal.
Description
Technical field
The utility model relates to radio frequency arts more particularly to a kind of radio-frequency units, and specifically a kind of increase is believed
The radio-frequency unit of number dynamic range.
Background technique
Currently, in radar radiofrequency signal analogue system, the multistage amplification by radio-frequency channel and mould of decaying to control
The watt level of quasi- radiofrequency signal.Since radio-frequency channel can generate internal noise, pass through the same of radio-frequency channel amplified signal
When, the internal noise that it is generated can also be amplified.And in the case where output signal-to-noise ratio is certain, the size of internal noise is straight
Connect the minimum strength for determining institute's simulated target signal.Specifically, if internal noise is larger, the echo signal of system simulation generation
Minimum strength be it is smaller.If the minimum strength for the echo signal that system simulation generates is too small, will exist and be unable to reach radar
The problem of minimum detectable signal intensity of receiver, so, radar receiver, can not detect that the simulated target is believed
Number.Therefore, it is how to minimize internal noise that radar radiofrequency signal analogue system, which suffers from a problem that,.Generally with noise system
Count the size to indicate internal noise.Noise coefficient is represented by NF=10lgF, and wherein F indicates noise factor.For one two
Port network, the ratio of noise factor, that is, network input signal-to-noise ratio and network output signal-to-noise ratio.
It is indispensable device that passive device, which is in radio-frequency channel, and position of the passive device in radio-frequency channel is different,
Influence to system noise factor is just different.Specifically, it is assumed that the insertion loss of passive device is L, and the gain of amplifier is Ga、
Noise coefficient is Fa, then when amplifier is located at the prime of passive device, as shown in Fig. 1 (a), the cascade noise factor of the two isWhen passive device is located at the prime of amplifier, as shown in Fig. 1 (b), the cascade noise factor expression formula of the two
It is F=LFaF=LFa.Noise factor is taken after logarithm to get to the noise coefficient of two kinds of different situations lower networks.Therefore, for
Network shown in Fig. 1 (a), when the gain of amplifier is larger, noise coefficient is approximately equal to the noise coefficient of amplifier；For figure
Network shown in 1 (b), noise coefficient are the sum of the noise coefficient of amplifier and the Insertion Loss value of passive device.As it can be seen that when passive
When device is located at the prime of amplifier, it can obviously deteriorate the noise coefficient of entire front end.Therefore, the prime of amplifier should be as far as possible
Ground, which reduces passive device, should minimize their Insertion Loss if some passive devices must be placed in the prime of amplifier, with
Minimize the deterioration degree of noise coefficient.
In the design of actual radio frequency channel circuit, in order to generate the larger signal of power, it is often necessary to by amplifier and numerical control
Attenuator cascade uses, although numerical-control attenuator is passive device, since the input power of numerical-control attenuator generally can not be big
In 20dBm, therefore numerical-control attenuator must be placed on to amplifier prime, as shown in Figure 2.Assuming that the maximum attenuation of numerical-control attenuator
Amount is 30dB, and the gain of amplifier is 35dB, and the noise coefficient of amplifier is 2, is calculated according to the noise coefficient of earlier figures 1 (b)
Formula, when attenuator attenuation is 30dB, the noise coefficient of network is maximum, be equivalent to noise coefficient be 32, two that gain is 3
Port network, output noise power improve 35dB than input noise power.Ideally, when the noise signal of input is heat
When noise, the input noise power of noise signal is -104dBm, then the output noise power of network shown in Fig. 2 is -69dBm, root
According to the minimum signal of system worked well 5dB higher than noise power is calculated, then minimum-the 64dBm of output signal power.Also
It is to say, in radio circuit shown in Fig. 2, since output noise power is higher, being unable to satisfy the small signal of generation (such as -70dBm) is needed
It asks.
Utility model content
In view of this, the present invention provides a kind of radio-frequency units, to overcome numerical control in existing radio-frequency channel circuit to decline
It is big to subtract the device output noise power caused with amplifier cascade, is unable to satisfy the deficiency for generating small signal, can be effectively reduced
Output noise power increases the dynamic range of output signal.
In order to achieve the above objectives, the utility model adopts the following technical solution:
A kind of radio-frequency unit is provided, is applied to radio-frequency channel circuit, the radio-frequency unit includes: that the first single-pole double throw is opened
Pass, the second single-pole double-throw switch (SPDT), amplifier and numerical-control attenuator；
RF signal input end of the moved end of first single-pole double-throw switch (SPDT) as the radio-frequency unit, two non-moving ends
It is separately connected the input terminal of the amplifier and the input terminal of the numerical-control attenuator；
The output end of the amplifier connects a non-moving end of second single-pole double-throw switch (SPDT), the numerical-control attenuator
Output end connects another non-moving end of second single-pole double-throw switch (SPDT), described in the moved end of second single-pole double-throw switch (SPDT) is used as
The RF signal output of radio-frequency unit.
It, can gated amplifier by two single-pole double-throw switch (SPDT)s of control based on above-mentioned radio-frequency unit provided by the utility model
Branch or numerical-control attenuator branch can the biggish radiofrequency signals of output power when gating amplifier branch；When gating numerical control
It is passive device, the noise coefficient of circuit is numerical-control attenuator since this branch only has numerical-control attenuator when attenuator branch
Attenuation, output noise power is smaller, therefore can control the attenuation of numerical-control attenuator as needed at this time, output power compared with
Small radiofrequency signal, to meet the needs of generating small signal.To sum up, radio-frequency unit provided by the utility model can either generate
The biggish radiofrequency signal of output power can also generate small-power radiofrequency signal more smaller than existing apparatus output power, therefore
Compared with prior art, radio-frequency unit provided by the utility model is capable of increasing the dynamic range of output signal.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is two kinds of cascade schematic diagrames of passive device and amplifier, and wherein Fig. 1 (a) amplifier is located at passive device
Cascade schematic diagram when prime, Fig. 1 (b) are cascade schematic diagram when passive device is located at the prime of amplifier；
Fig. 2 is the cascade schematic diagram of numerical-control attenuator and amplifier in existing radio-frequency channel circuit；
Fig. 3 is the composition schematic diagram of radio-frequency unit provided by the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Fig. 3 show a kind of composition schematic diagram of radio-frequency unit provided by the utility model.
Radio-frequency unit provided by the utility model is applied to radio-frequency channel circuit, as shown in figure 3, the radio-frequency unit packet
It includes: the first single-pole double-throw switch (SPDT) 301, the second single-pole double-throw switch (SPDT) 302, amplifier 303 and numerical-control attenuator 304.
Wherein, RF signal input end 305 of the moved end of the first single-pole double-throw switch (SPDT) 301 as radio-frequency unit, two are not
Moved end is separately connected the input terminal of amplifier 303 and the input terminal of numerical-control attenuator 304.
The output end of amplifier 303 connects a non-moving end of the second single-pole double-throw switch (SPDT) 302, numerical-control attenuator 304 it is defeated
Outlet connects another non-moving end of the second single-pole double-throw switch (SPDT) 302, and the moved end of the second single-pole double-throw switch (SPDT) 302 is as radio-frequency unit
RF signal output 306.
In radio-frequency unit provided by the utility model, single-pole double-throw switch (SPDT) for control 303 branch of gated amplifier or
304 branch of numerical-control attenuator；Amplifier 303 is used to amplify the radio-frequency input signals of RF signal input end access, generates big function
Rate radio frequency output signal；Numerical-control attenuator 304 is used for the radio-frequency input signals of attenuating RF signals input terminal access, generates small function
The radio frequency output signal of rate.It, can by two single-pole double-throw switch (SPDT)s of control based on above-mentioned radio-frequency unit provided by the utility model
304 branch of 303 branch of gated amplifier or numerical-control attenuator, when 303 branch of gated amplifier, can output power it is biggish
Radiofrequency signal；It is passive device, electricity since this branch only has numerical-control attenuator 304 when gating 304 branch of numerical-control attenuator
The noise coefficient on road is the attenuation of numerical-control attenuator 304, and output noise power is smaller, therefore can be controlled as needed at this time
The attenuation of numerical-control attenuator 304, the lesser radiofrequency signal of output power, to meet the needs of generating small signal.It is i.e. practical
The radio-frequency unit of novel offer can obtain biggish dynamic range of signals while guarantee obtains big signal, overcome existing
There is the deficiency that the output noise of device is high, output signal dynamic range is small.
Preferably, in radio-frequency unit provided by the utility model, the first single-pole double-throw switch (SPDT) 301 and the second single-pole double throw
The frequency range of switch 302 is 3-9GHz, and isolation is greater than 50dB, and Insertion Loss is lower than 2.3dB；The frequency model of numerical-control attenuator 304
It encloses for 6-18GHz, Insertion Loss is lower than 3dB；The frequency range of amplifier 303 is 5.9-18GHz, gain 35dB, and noise coefficient is small
In 2dB, Maximum Power Output 3W.
Illustratively, above-mentioned parameter of being subject to below provides one and illustrates the effect of the utility model:
When RF signal input end access power is the radiofrequency signal of 6GHz, the first single-pole double-throw switch (SPDT) and the second hilted broadsword
The Insertion Loss of commutator is 2dB, and the Insertion Loss of numerical-control attenuator is 3dB, maximum attenuation amount is 30dB, and the gain of amplifier is
35dB, noise coefficient 2dB.
When two single-pole double-throw switch (SPDT) gated amplifier branches, radio-frequency unit provided by the utility model can regard noise as
The two-port network that coefficient is 4dB, gain is 31dB.Assuming that the power of input radio frequency signal is -1dBm, then radiofrequency signal is exported
Power, that is, reachable -1+31=30dBm=1W；
When two single-pole double-throw switch (SPDT)s gate numerical-control attenuator branch, radio-frequency unit provided by the utility model is passive
Two-port network, noise coefficient are the sum of all attenuations of branch.Since the maximum attenuation amount of numerical-control attenuator is 30dB,
The Insertion Loss of two single-pole double-throw switch (SPDT)s is 2dB, therefore the noise coefficient of branch is 34dB.Assuming that input noise power is little
In -70dBm, output noise power is -70-34=-104dBm, according to making the minimum signal of system worked well compare noise power
High 5dB is calculated, the minimum -99dBm of output signal power.Minimum-the 64dBm of the output signal power of existing apparatus, it is seen then that this
The radio-frequency unit that utility model provides increases 35dB than the dynamic range of signals that existing apparatus generates.Further, when needs
When minimum output signal power is -70dBm, the signal noise power inputted is allowed to can achieve -41dBm, therefore compared to existing
Device, the permitted input noise power of radio-frequency unit provided by the utility model also increase.
In a kind of concrete implementation mode, the model of the first single-pole double-throw switch (SPDT) 301 and the second single-pole double-throw switch (SPDT) 302
F8924, the model GMC3498-64 of numerical-control attenuator 304, the model ZVE-3W-183+ of amplifier 303.
Those of ordinary skill in the art will appreciate that: above description is only a specific implementation of the present invention, but this
The protection scope of utility model is not limited thereto, and anyone skilled in the art discloses in the utility model
It in technical scope, can easily think of the change or the replacement, should be covered within the scope of the utility model.Therefore, this reality
It should be based on the protection scope of the described claims with novel protection scope.
Claims (5)
1. a kind of radio-frequency unit, which is characterized in that the radio-frequency unit is applied to radio-frequency channel circuit, the radio-frequency unit packet
It includes: the first single-pole double-throw switch (SPDT), the second single-pole double-throw switch (SPDT), amplifier and numerical-control attenuator；
RF signal input end of the moved end of first single-pole double-throw switch (SPDT) as the radio-frequency unit, two non-moving end difference
Connect the input terminal of the amplifier and the input terminal of the numerical-control attenuator；
The output end of the amplifier connects a non-moving end of second single-pole double-throw switch (SPDT), the output of the numerical-control attenuator
End connects another non-moving end of second single-pole double-throw switch (SPDT), and the moved end of second single-pole double-throw switch (SPDT) is as the radio frequency
The RF signal output of device.
2. radio-frequency unit according to claim 1, which is characterized in that first single-pole double-throw switch (SPDT) and second list
The frequency range of double-pole double throw switch is 3-9GHz, and isolation is greater than 50dB, and Insertion Loss is lower than 2.3dB.
3. radio-frequency unit according to claim 1, which is characterized in that the frequency range of the numerical-control attenuator is 6-
18GHz, Insertion Loss are lower than 3dB, and maximum attenuation amount is 30dB.
4. radio-frequency unit according to claim 1, which is characterized in that the frequency range of the amplifier is 5.9-18GHz,
Gain is 35dB, and noise coefficient is less than 2dB, Maximum Power Output 3W.
5. radio-frequency unit according to claim 1, which is characterized in that first single-pole double-throw switch (SPDT) and second list
The model F8924 of double-pole double throw switch, the model GMC3498-64 of the numerical-control attenuator, the model of the amplifier
ZVE-3W-183+。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820561887.5U CN208226999U (en) | 2018-04-19 | 2018-04-19 | A kind of radio-frequency unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820561887.5U CN208226999U (en) | 2018-04-19 | 2018-04-19 | A kind of radio-frequency unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208226999U true CN208226999U (en) | 2018-12-11 |
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ID=64512120
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820561887.5U Expired - Fee Related CN208226999U (en) | 2018-04-19 | 2018-04-19 | A kind of radio-frequency unit |
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| Country | Link |
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| CN (1) | CN208226999U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111342779A (en) * | 2020-04-14 | 2020-06-26 | 湖北楚航电子科技有限公司 | Multichannel radio frequency power amplifier subassembly |
| CN114039566A (en) * | 2022-01-07 | 2022-02-11 | 中国人民解放军海军工程大学 | Anti-blocking interference automatic gain control circuit and control method |
| CN117081595A (en) * | 2023-10-16 | 2023-11-17 | 长沙北斗产业安全技术研究院股份有限公司 | Signal acquisition system, signal acquisition method and device |
-
2018
- 2018-04-19 CN CN201820561887.5U patent/CN208226999U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111342779A (en) * | 2020-04-14 | 2020-06-26 | 湖北楚航电子科技有限公司 | Multichannel radio frequency power amplifier subassembly |
| CN114039566A (en) * | 2022-01-07 | 2022-02-11 | 中国人民解放军海军工程大学 | Anti-blocking interference automatic gain control circuit and control method |
| CN117081595A (en) * | 2023-10-16 | 2023-11-17 | 长沙北斗产业安全技术研究院股份有限公司 | Signal acquisition system, signal acquisition method and device |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181211 Termination date: 20190419 |
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| CF01 | Termination of patent right due to non-payment of annual fee |