Study, Modeling and Characterization of Dual-Band LNA Amplifiers Receivers for Wireless Microwaves Communication Systems

Abstract

The new current design is especially suitable for use in mu lti-standard wireless receiver fo r microwaves communicat ion systems. In recent years, there has been a growing market for dual band transceivers for various wireless standards. This work investigates a novel circuit topology of concurrent Dual-band Low No ise Amplifier (LNA) operates in the 3.9 GHz and 4.48 GHz frequency bands for WLAN applications and may be used for dual band cellular applications. RF circuit designs take two parallel LNAs with a single transistor only, and band-pass filter (BPF) networks are usually used match both the input and output ports at two different bands, are matched to 50Ω without external elements. The transistor ATF1 0136 is chosen for the purpose of high gain and low noise characteristics. Simulat ions of the operation of the amp lifier were performed with the software ADS and Ansoft software and performance of the amplifier were recorded and analyzed. Simulat ion results indicate a Noise Figure NF below 1.5dB and a gain S21 above 11 d B in all frequency bands and also input and output return loss are below -11 d B for all desired frequency band while drawing 2.5mA current fro m a 5V power supply. The chip provides a good basis for the realization of W LAN lo w-cost RF receivers for dual-band operation. These performances situate this receiver among the most competitive low cost and low power RF receivers. All the principles carry out in this work are furthermo re transposable to other frequencies and to other transmission standards.

The Design of Plant Growth Detection System Based on Spectroscopy

“…Considering the characters of the photoelectric sensor, it should be avoided to input undesired signal. So we selected the TLC271 operational amplifier because it not only combined a wide range of input offset voltage grades with low voltage offset drift and high input impedance but also offered a bias-select mode that allowed the user to select the best combination of power dissipation and ac performance for a particular application [4]. Data acquisition system was designed to perform data acquisition, data calculation, data display, data storage, and data transition.…”

A Novel and Single Chip Tri-Band Low-Noise Amplifier for Wlan, Wifi and Wimax Receivers

“…The inductive feedback moves the source impedance for optimum NF toward the optimum power match with a minor increase in the minimum NF. Cascade configuration can be used to enhance stability, reverse isolation of the amplifier and reduce Miller effect [2][3][4][5].…”

“…Wireless telephony uses different frequency bands (900 MHz, 1800 MHz, 1900 MHz, 2200MHz …), hence most mobile phones on the market nowadays offer to cover these bands with tri-band or quad-band mobile phones, which requires the multiplication of channels of receive and transmit radio frequency to treat each of these frequencies. This increases costs and causes usability issues since you need more space to perform the multitude of channels [2][3][4][5][6][7].…”

“…However, a suitable LNA must be designed and realized before implementing a multi-standard receiver. And two ways can approach this goal, wideband or multi-band structure [4][5][6].…”