CN217824901U - Short wave broadband ultra-low noise amplifier - Google Patents
Short wave broadband ultra-low noise amplifier Download PDFInfo
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- CN217824901U CN217824901U CN202221681125.1U CN202221681125U CN217824901U CN 217824901 U CN217824901 U CN 217824901U CN 202221681125 U CN202221681125 U CN 202221681125U CN 217824901 U CN217824901 U CN 217824901U
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Abstract
The utility model discloses an ultralow noise amplifier of shortwave broadband, directional coupler including two transformer constitutions, and a low noise amplifier, an output series transformer of low noise amplifier, input shunt transformer of low noise amplifier establishes ties transformer T2's primary coil L1 between amplifier A1's output and load, adopts two transformers to realize the ultralow noise amplifier of shortwave broadband, and is different with resistance feedback, and lossless feedback network can not reduce the noise figure and the gain that the low noise was put. In consideration of wide frequency band and structure, the transformer adopts a traditional lumped parameter transformer, and is formed by winding a coil on a ferrite magnetic ring, so that the transformer has the characteristics of a lumped parameter element, namely small size and large relative bandwidth, and compared with a monolithic amplifier, the designed low-noise amplifier has the following characteristics: low working frequency, low noise coefficient, wide frequency band and good return loss.
Description
Technical Field
The utility model belongs to the technical field of the communication technology and specifically relates to a short wave broadband ultra-low noise amplifier is related to.
Background
The low noise amplifier is an essential important component in communication, radar, electronic countermeasure and remote control and remote measurement systems, is positioned at the front end of a radio frequency receiving system, and mainly has the functions of linearly amplifying weak radio frequency signals received by an antenna, simultaneously inhibiting various noise interferences and improving the sensitivity of the system. Particularly, as communication, electronic countermeasure, microwave measurement, and the like are developed toward broadband, low noise, and miniaturization, the low noise and broadband design problem of the amplifier is more and more emphasized.
The main obstacle in wideband amplifier design is the constraint of the gain-bandwidth product of the active device, i.e., the gain of the active device drops at the high end of the frequency by 6 dB/octave with increasing frequency. Common design methods for broadband amplifiers are: balanced structure amplifiers, negative feedback amplifiers, active matching circuits, reactance network matching, broadband resistance matching, distributed amplifiers, and the like. The negative feedback amplifier has the following obvious advantages: the sensitivity of the whole circuit to the performance change of the transistor is reduced; better input impedance matching and lower noise coefficient are obtained; increasing the stability of the amplifier in the operating band; increasing the linearity of the amplifier, etc. Therefore, the negative feedback technique is widely used in the design of the wideband amplifier.
In the conventional broadband amplifier stage, a resistance feedback method (as shown in fig. 1) is often adopted, and in a low frequency band with higher gain, the gain can be reduced through negative feedback of a transmitter resistance and a collector resistance; at the high frequency end with lower gain, the collector feedback is reduced, so that the gain of the amplifier is increased, but the resistance feedback has great influence on the dynamic range of the amplifier; on the one hand, the noise figure of the system increases with the number of system feedbacks due to harmonic interference caused by the resistance noise itself, so that the noise figure of the broadband amplifier is very poor and even inferior to that of the broadband RF amplifier without feedback.
For this purpose, a short-wave broadband ultra-low noise amplifier is proposed.
Disclosure of Invention
An object of the utility model is to provide a short wave broadband ultra-low noise amplifier adopts two transformers to realize short wave broadband ultra-low noise amplifier, and is different with resistance feedback, and lossless feedback network can not reduce noise figure and gain that the low noise was put. In consideration of wide frequency band and structure, the transformer is formed by winding a coil on a ferrite magnetic ring by adopting a traditional lumped parameter transformer, so that the transformer has the characteristics of concentrated parameter elements, namely small size and large relative bandwidth, and solves the problems in the background technology.
In order to achieve the above object, the utility model provides a following technical scheme: the short-wave broadband ultra-low noise amplifier comprises a directional coupler consisting of two transformers and a low-noise amplifier, wherein one output end of the low-noise amplifier is connected with the transformers in series, one input end of the low-noise amplifier is connected with the transformers in parallel, and a primary coil L1 of a transformer T2 is connected between the output of an amplifier A1 and a load in series. The secondary coil L2 is cascaded with the primary coil L1 of the T1, and the secondary coil L2 of the T1 is connected in parallel with the input end.
Preferably, the low noise amplifier employs AST54S.
Compared with the prior art, the beneficial effects of the utility model are that:
the short-wave broadband ultra-low noise amplifier is realized by adopting two transformers, and unlike resistance feedback, a lossless feedback network cannot reduce the noise coefficient and gain of low-noise amplification. In consideration of wide frequency band and structure, the transformer adopts a traditional lumped parameter transformer, and is formed by winding a coil on a ferrite magnetic ring, so that the transformer has the characteristics of a lumped parameter element, namely small size and large relative bandwidth, and compared with a monolithic amplifier, the designed low-noise amplifier has the following characteristics: the working frequency is low, the noise coefficient is small, the frequency band is wide, the return loss is good, and the blank of short-wave low-noise amplification on the market is filled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a simplified model of a conventional parallel negative feedback circuit;
fig. 2 is a block diagram of the lossless low noise feedback amplifier of the present invention;
FIG. 3 is an AWR simulation schematic diagram of the present invention;
FIG. 4 is a simulation result diagram of the present invention;
fig. 5 is a block diagram of the noise figure test of the present invention.
Fig. 6 shows the noise figure test result of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 to 6, the present invention provides a technical solution:
the short-wave broadband ultra-low noise amplifier comprises a directional coupler consisting of two transformers and a low-noise amplifier, wherein one output end of the low-noise amplifier is connected with the transformers in series, one input end of the low-noise amplifier is connected with the transformers in parallel, and a primary coil L1 of a transformer T2 is connected between the output of an amplifier A1 and a load in series. The secondary coil L2 is cascaded with the primary coil L1 of the T1, and the secondary coil L2 of the T1 is connected in parallel with the input end.
Specifically, the low noise amplifier employs AST54S.
A low-noise monolithic amplifier AST54S with higher frequency is adopted, a lossless feedback technology is adopted, simulation is firstly carried out by AWR radio frequency microwave simulation software according to a schematic diagram of a diagram 3 of the AST54S low-noise amplifier, a simulation result is shown in a diagram 4, the fact that the gain flatness is only less than 0.1dB within the range of 8-20 MHz, and the input return loss is less than-22.35 dB (equivalent to a standing-wave ratio of 1.17)
And (3) designing a circuit according to simulation parameters, and after the circuit is assembled, testing according to a block diagram of fig. 5 to obtain a better result, wherein NF:0.8-1.0dB @10MHz,0.5-0.6dB @20MHz, G: >20dB @ (8-28 MHz).
The working principle is as follows: the output signal is coupled to the secondary coil through the primary coil of T2, and the secondary coil L2 is connected with the primary coil L1 of T2 in series. And then the negative feedback signal is coupled to the input end of the amplifier A1 in parallel through the T2 to form negative feedback, so that the S parameter of the transistor is optimized.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the scope of the invention in its corresponding aspects.
Claims (2)
1. Short wave broadband ultra-low noise amplifier, directional coupler including two transformers are constituteed to and a low noise amplifier, its characterized in that: one output end of the low noise amplifier is connected with a transformer in series, one input end of the low noise amplifier is connected with the transformer in parallel, a primary coil L1 of the transformer T2 is connected between the output of the amplifier A1 and a load in series, a secondary coil L2 is connected with the primary coil L1 of the T1 in series, and a secondary coil L2 of the T1 is connected with the input end in parallel.
2. The short wave broadband ultra-low noise amplifier of claim 1, wherein: the low noise amplifier adopts AST54S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221681125.1U CN217824901U (en) | 2022-06-30 | 2022-06-30 | Short wave broadband ultra-low noise amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221681125.1U CN217824901U (en) | 2022-06-30 | 2022-06-30 | Short wave broadband ultra-low noise amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217824901U true CN217824901U (en) | 2022-11-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202221681125.1U Active CN217824901U (en) | 2022-06-30 | 2022-06-30 | Short wave broadband ultra-low noise amplifier |
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| CN (1) | CN217824901U (en) |
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2022
- 2022-06-30 CN CN202221681125.1U patent/CN217824901U/en active Active
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