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Design of Broadband Low Noise Amplifier Based on HEMT Transistors in the X-Band

Keywords: LNA , Adaptation , T and PI Circuits , Filters , Stability , Noise , Gain

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Abstract:

In this paper, we have modeled a low noise amplifier LNA based on HEMT transistors of Alpha Industries , adapted by band pass filters in the X-band. A detailed study of performance optimizations for stability and noise of the different adaptation circuits was established. This amplifier is two-stage circuit. It is unconditionally stable in the band [8-12] GHz with a gain greater than 22.48 dB, a noise figure less than 1.1 dB and reflection coefficients at the input and output (S11, S22) less than -20 dBand - 40 dB respectively. The amplifier designed can be integrated in radar systems, amateur radio and civil and military radiolocation systems.

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