Design, implementation and evaluation of Broadband Low Noise Amplifier (LNA) for radiometer (original) (raw)

Efficient Wideband High Gain Low Noise Amplifier in Modern Radars

in this paper a wide band single stage pseudo morphic high electron mobility transistor (PHMET) amplifier has been designed at 5.8 GHz, the input and output matching circuits have a pi form.Noise cancelling principle and sensitivity analysis are performed .Simulation results have been compared with their correspondence in [10] give 2.71 dB improvement in amplifier gain at the same noise figure (N.F) and input, output returns loss. A new optimized low noise amplifier (LNA) using PHEMT at 3 GHZ have been designed to achieve an improvements of 3.3 dB in amplifier gain and 1.81 dB in noise figure.Also the two stages (common gate in cascaded with common source) LNA have been analyzed and optimized for (1-16) GHz full band application to achieve maximum gain over a wide frequency band. Simulation results carried out sever improvement in amplifier gain over the results obtained for the two structures in [16-17] respectively with no change in N.F value .The improvement in optimized gain for the first and second structures are (3.278, 2.82) dB. The comparative study between the traditional and optimized structures showing a superior performance of LNA making them sutiable to be used in modern radar systems.

Design of narrow band UHF low noise amplifier for wind profilers

Microwave and Optical Technology Letters, 2015

The design of UHF low noise amplifier (LNA) aiming for wind profiling radar application is presented in this article. The receiver sensitivity in detecting long distance atmospheric signals of a wind profiling radar depends on the noise performance of the LNA. Modified source degenerated inductance methodology along with the high pass matching circuit is used for the improvement of noise figure, input and output return losses. It is shown that the designed LNA circuit is capable of achieving low noise performance with narrow band tuning at 1.3 GHz. The LNA is designed in a pHEMT technology and fabricated on a RT/duroid substrate. The measured results of the designed LNA show a maximum gain of 18.78 dB with an associated noise figure of 0.45 dB. The input and output return losses (S 11 and S 22) are 10.7 and 14 dB and we have achieved a high third order input intercept point (IIP3) of 52 dBm.

HIGH-GAIN SUB-DECIBEL NOISE FIGURE LOW NOISE AMPLIFIER FOR ATMOSPHERIC RADAR

Wiley Publication, 2016

This article presents the design of a compact and low-cost single-stage narrow band low-noise amplifier (LNA) for atmospheric radar application. Active feedback technique is employed to improve linearity without affecting the noise figure and gain. The source-degenerated inductor topology is used along with the cascaded transistors to achieve stability with maximum gain and minimum noise figure simultaneously. High-pass input and output matching circuits are used to improve input and output return losses. The amplifier was implemented on a low-loss substrate RT/duroid with pseudomorphic high electron mobility transistor (pHEMT) technology at 1.3 GHz. The measured results of LNA exhibit a gain of 28 dB and noise figure of 0.39 dB. The input and output return losses are <10.8 dB and third-order input intercept point is 33 dBm.

Modeling of a Microwave Amplifier Operating around 11 GHz for Radar Applications

International Journal of Electrical and Computer Engineering (IJECE), 2018

The low noise amplifier is one of the basic functional blocks in communication systems. The main interest of the LNA at the input of the analog processing chain is to amplify the signal without adding significant noise. In this work, we have modeled a LNA for radar reception systems operating around 11 GHz, using the technique of impedance transformations with Smith chart utility. The type of transistor used is: the transistor HEMT AFP02N2-00 of Alpha Industries®. The results show that the modeled amplifier has a gain greater than 20 dB, a noise figure less than 2 dB, input and output reflection coefficients lower than-20 dB and unconditional stability. Keyword: Gain Low noise amplifier (LNA) Matching Noise figure Stability

AN EXTENSIVE REVIEW ON: LOW NOISE AMPLIFIER FOR MILLIMETER AND RADIO FREQUENCY WAVES

Jurnal Teknologi, 2021

In today's world, radio receiver system is a prevailing wireless technology in that the major part is Low Noise Amplifier (LNA) which widely used to improve weak signals in many applications with millimeter and radio frequency waves such as optical communication, multimode transceivers and measurement instrumentations. The real drawbacks of LNA is that it fails to maintain specific properties in critical conditions like as minimum power consumption, provide low noise figure, input matching and linearity. Additionally, promoted by various application demands, design methods and control methods must require to improve performance of LNA. The performance of LNA can be improved by adding extra components in basic circuit by proper arrangement for millimeter and radio frequency waves. The review paper provides information about design methodology, optimization techniques and control techniques. The different design of LNA is reviewed and analyzed such as 3-stage near-mm Wave LNA, 5-stage near-mm Wave LNA, common-gate amplifier, shunt-feedback amplifier, Resistor-terminated common-source amplifier, Traditional inductor-less amplifiers, cascode connection and double common source. This review paper also provides the information about design circuit diagram. The performance improvement of LNA can be achieved with the help of different techniques and our review based on optimization and control techniques with parameter tuning. Finally, the direction for the future study is presented based on review analysis of LNA.

Design and Analysis of Low Noise Amplifier Using Active Feedback for Boundary Layer Radar

IEEE, 2014

The design of low noise amplifier (LNA) at 915MHz for boundary layer radar application is presented in this paper. An active feedback with neutralization capacitance is adopted for the design to boost the gain of the LNA. The excellent optimum tradeoff between noise figure (NF) and gain is achieved by using source degenerated inductor and input and output T-network LC tuning circuit. Source degenerated inductor is useful in achieving stability over a wide range of frequencies. To obtain optimum performance of LNA, low loss and low cost dielectric substrate RT/duroid RO4003C is used. The simulated results of LNA show that the circuit is having a noise figure of 0.233 dB which is very close to the minimum noise figure of the circuit with a gain of 21 dB. The isolation loss is less than-27 dB and the input and output return losses are less than-10 dB. LNA consumes a total power of 180 mW from 3 volts supply. Keywords-Boundary layer radar, low noise amplifier, linearity, noise figure (NF), negative feedback, ultra high frequency, wind profiling.

GaAs pHEMT broadband low-noise amplifier for millimeter-wave radiometer

Microwave and Optical Technology Letters, 2003

an appropriate low-pass filter between each antenna element. The frequency separation is, in principle, arbitrary, but the requirements on the low-pass filters in the case of closely-spaced frequency bands might increase the filters' physical length, thus complicating the layout. A solution would be to use higher permittivity substrate in order to reduce the filter dimensions.

An X-band Low Noise Amplifier Design for Marine Navigation Radars

In this paper the design of a 9.1GHz Low Noise Amplifier (LNA) of a RADAR receiver that is used in the Navy is presented. For the design of the LNA we use GaAsField-Effect Transistors (FETs) from Agilent ADS component library. Even though this transistor type is more expensive than the Si Bipolar Junction Transistor (BJT), it is preferred for its ability to achieve higher gain operation in high frequencies in comparison to the Si BJT. In order to keep the cost of the circuit low and at the same time to accomplish high performance, we design a two stages' LNA. The final design has a gain of 20.1 dB and a Noise Figureof 6.9 dB and it is appropriate for Marine Navigation RADARs by having a broadband frequency of operation.