Design of narrow band UHF low noise amplifier for wind profilers

Abstract

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 (S11 and S22) are 10.7 and 14 dB and we have achieved a high third order input intercept point (IIP3) of 52 dBm. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:600–603, 2015

High-gain sub-decibel noise figure low noise amplifier for atmospheric radar

“…If the source inductor value is increased for input matching and high linearity, there is degradation in NF and gain as the resistance of the inductor , so the optimum selection of source inductor is required to achieve minimum noise figure.…”