![]() ![]() ![]() The design circuit uses single stub matching to implement the matching network. ![]() This paper is present design and simulation of singlestage LNA circuits.The amplifier design were designed by using ATF 54143 transistor manufactured from Avago Technologies. This paper presents a 4GHz Low Noise Amplifier for satellite downlink communication.This frequency indicate in the IEEE C-band.Satellite downlink communication located at the front end of LNA.Thus,this LNA required to amplify the signal without adding much noise. The electrical performances of the 30 and 44 GHz Back End Modules: frequency response, effective bandwidth, equivalent noise temperature, 1/f noise and linearity are presented. A description of the 30 and 44 GHz Back End Modules of Planck-LFI radiometers is given, with details of the tests done to determine their electrical and environmental performances. Electrical, mechanical and environmental tests were carried out for the characterization and verification of the manufactured BEMs. Their manufacturing development has included elegant breadboard prototypes and finally qualification and flight model units. The BEM design is based on MMIC Low Noise Amplifiers using GaAs P-HEMT devices, microstrip filters and Schottky diode detectors. Each receiver has two identical branches following the differential scheme of the Planck radiometers. The signals coming from the Front End Module are amplified, band pass filtered and finally converted to DC by a detector diode. The 30 and 44 GHz Back End Modules (BEM) for the Planck Low Frequency Instrument are broadband receivers (20% relative bandwidth) working at room temperature. The layout obtained shows the concept of high and low impedance Low Pass filter also known as stepped impedance techniques. Also layout of Low Pass filter is obtained. The simulated results show that the cut-off frequency obtained is 3.04 GHz which is slightly greater than 2.8 GHz. Low-pass filter is implemented by microstrip lines using sections of varying characteristics impedance lines. The filter designed using stepped-impedance is also known as Hi-Z or Low-Z filters. The simulation result carried out reveal that they are in complete agreement with the design specifications The main types of distributed filters used today are combline, interdigital, parallelcoupled- line bandpass and bandstop, and stepped-impedance filters. Design and simulation of Microstrip coupled line band-pass filter is done at 2.40 GHz operating frequency, with 5th order Chebyshev 0.5 dB ripple and 200 MHz of bandwidth using ADS simulation software. The simulated results obtained are sufficient enough so that it can be used for different wireless applications. The entire simulation is carried out using the ADS tool. The second stage is a power stage to improve broadband gain along with power. Therefore it can be called as a totem pole technique circuit. The proposed LNA consists of two stages, first is acting as a pull down amplifier as its drain is pull down using an LC cascade circuit which helps improving noise figure as well as broadband matching. A novel design is proposed here where a unique technique is applied to the LNA. ![]() Transistor M1 is biased with drain voltage of 0.98V with gate biased at -0.1V and provides a sufficient current to drive transistor M2. First stage transistor is driving second stage along with total current. The first stage is optimized for noise matching and the resistive shunt-feedback stage provides wideband gain and good stability. The LNA is designed by using 0.15μm GaAs pHEMT process. This project proposes the wideband LNA with analyses on the key performance factors required for UWB LNA design, such as noise performance, and linearity over a wide bandwidth. The aims of this project are to design and implement Low Noise Amplifier in the Ultra Wide Band frequency, Realization of Microstrip Band Pass Filter Design and Realization of Low Pass Filter using stepped impedance technique. ![]()
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