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"DESIGN OF AN ACTIVE FEEDBACK LOW NOISE AMPLIFIER WITH IMPROVED LINEARIZATION", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 2, page no.869-879, February-2021, Available :http://www.jetir.org/papers/JETIR2102102.pdf

• Nuhu Umar Elisha
• Mutari Hajara Ali

The application of active feedback using source follower provides wide bandwidth. However, the source follower introduces non-linearity within the passband. This study proposes a way to mitigate this problem through the use of a resonant tank connected along the feedback path, which exploit the blocking capacity of the capacitor to linearize the source follower. Also, we adopted the inductive peaking technique for bandwidth enhancement, noise performance improvement and circuit stability. With the combination of these techniques, an improved linearity for the active feedback low noise amplifier for wideband receivers was achieved while improving the noise performance. Simulated result of the low noise amplifier showed a power gain of 13.13dB and a 3dB bandwidth of 16.88MHz. It achieved an input return loss < -10dB, reverse isolation better than -23.4dB, output return loss < -14dB. Output total RMS noise achieved is 9.1μV while dissipating and average of 67.512mW from a 9V supply. The simulated result for both input and output return losses are < -10dB, this implies good impedance matching at both input and output of the LNA. This work shows it is possible to linearize an active feedback LNA by adding a resonant tank along the feedback path.

Active-Feedback, Low noise amplifier, resonant tank linearization, linear, wideband.

"DESIGN OF AN ACTIVE FEEDBACK LOW NOISE AMPLIFIER WITH IMPROVED LINEARIZATION", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 2, page no. pp869-879, February-2021, Available at : http://www.jetir.org/papers/JETIR2102102.pdf