Multi-channel feedback type broadband low-noise amplifier

A low-noise amplifier, broadband low-noise technology, applied to amplifiers, amplifiers with semiconductor devices/discharge tubes, improved amplifiers to reduce noise effects, etc., can solve problems such as not well suppressing gain reduction, and achieve good gain Excellent performance, good gain flatness, and the effect of improving small signal gain

Inactive Publication Date: 2019-06-28
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the small-signal gain S21 of this low-noise amplifier has a roll-off of more than 3dB in the range of 4-8GHz, that is, the amplifier does not suppress the decrease of the gain at high frequencies well.

Method used

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  • Multi-channel feedback type broadband low-noise amplifier
  • Multi-channel feedback type broadband low-noise amplifier
  • Multi-channel feedback type broadband low-noise amplifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] See figure 1 , figure 1 It is a system block diagram of a multi-channel feedback broadband low noise amplifier provided by an embodiment of the present invention.

[0048] A multi-channel feedback broadband low noise amplifier provided by an embodiment of the present invention includes an input module, an amplification module and an output module.

[0049] An input module, electrically connected to the input terminal RFin of the low noise amplifier, for receiving and processing the input signal of the low noise amplifier;

[0050] An amplification module, electrically connected to the input module, for receiving and amplifying the signal output by the input module to obtain an amplified signal;

[0051] The output module is electrically connected to the amplification module and the output terminal RFout of the low noise amplifier, and is used to process the amplified signal and output it.

[0052] See figure 2 , figure 2 It is another system block diagram of a mu...

Embodiment 2

[0061] See image 3 , image 3 It is a schematic circuit diagram of a multi-channel feedback broadband low noise amplifier provided by an embodiment of the present invention.

[0062] In this embodiment, the input matching circuit IMN includes a first capacitor C 1 and the first inductance L 1 , the first capacitor C 1 and the first inductance L 1 It is sequentially connected in series with the input terminal RFin of the low noise amplifier and the gate of the transistor M1.

[0063] The function of the input matching circuit IMN is to adjust the input impedance of the low noise amplifier, so that the input stage of the low noise amplifier forms a good noise matching, and then the noise figure of the low noise amplifier is lower.

[0064] In this embodiment, the output matching circuit OMN includes a second capacitor C 2 , connected in series between the drain of the transistor M3 and the output terminal RFout of the low noise amplifier.

[0065] The function of the out...

Embodiment 3

[0100] In order to further illustrate the characteristics of the low noise amplifier provided by the embodiment of the present invention, the performance of the present invention will be further described below in combination with simulation experiments.

[0101] 1. Simulation content:

[0102] The characteristics of the low noise amplifier of the present invention include noise figure and gain.

[0103] 2. Simulation result analysis:

[0104] combine Figure 6 and Figure 7 The simulation results of the present invention are further described.

[0105] Figure 6 It is a noise figure simulation diagram of a multi-channel feedback broadband low-noise amplifier provided by an embodiment of the present invention. The figure shows the relationship curve between noise NF and frequency of the low-noise amplifier of the present invention. It can be seen from the figure that the noise figure NF is less than 1.8dB in the range from 5GHz to 15GHz, especially when the frequency is 7...

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Abstract

The invention discloses a multi-channel feedback type broadband low-noise amplifier which comprises an input module electrically connected with an input end RFin of the low-noise amplifier and used for receiving and processing an input signal of the low-noise amplifier; an amplification module electrically connected with the input module and is used for receiving and amplifying the signal output by the input module to obtain an amplified signal; and an output module electrically connected with the amplification module and the output end RFout of the low-noise amplifier, and is used for processing the amplified signal and outputting the processed amplified signal. According to the low-noise amplifier designed by the invention, the cascaded amplifying circuit is adopted. The problem that a low-noise amplifier achieves low noise in a wide frequency band and the problem that a broadband low-noise amplifier has gain roll-off in a high frequency are solved in different amplifying circuits, good noise and gain response in a broadband are achieved, meanwhile, the design pressure of each stage of circuit is relieved, and the performance performance of the whole amplifier is improved.

Description

technical field [0001] The invention belongs to the technical field of radio frequency integrated circuits, and in particular relates to a multi-channel feedback broadband low-noise amplifier. Background technique [0002] Low-noise amplifiers refer to amplifiers with very low noise figures, generally used as high-frequency or intermediate-frequency preamplifiers for various radio receivers, and amplifying circuits for high-sensitivity electronic detection equipment. In the case of amplifying weak signals, the noise of the amplifier itself may seriously interfere with the signal, so it is desirable to reduce this noise to improve the output signal-to-noise ratio. A high-performance low-noise amplifier can greatly improve the sensitivity of a communication system, and is an indispensable and important part of the entire communication system. In addition to requiring higher gain and lower noise, operating bandwidth is also an important factor in LNA design. With the continuo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/193H03F1/26H03F1/34
Inventor 吕红亮张宁乔世兴张艳松张玉明张义门
Owner XIDIAN UNIV
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