Abstract
AbstractRecent advances in the field of RF front end design have replaced multiple narrowband Low-Noise Amplifiers (LNA) with one wideband LNA to support a variety of bands and standards. The effectiveness of the RF front end is heavily dependent on the performance of the LNA, as it is the first block in the RF receiver. High gain, high linearity, low noise figure, and low power dissipation are all desirable characteristics in an LNA. Because of the wideband LNA’s large bandwidth, a lot of interference gets in without being filtered, and if the LNA isn’t linear, it causes harmonic distortion, cross modulation, intermodulation, as well as a drop in 1dB compression point (P1dB) and sensitivity. To reduce the negative effects of intermodulation, wideband LNA linearization requires improvements in both second-order intercept point (IIIP2) and third-order intercept point (IIP3). In this paper, previously reported linearization techniques that improve both IIP2 and IIP3 are investigated thoroughly and divided into five main categories: (a) feedback, (b) feedforward, (c) complementary derivative superposition (CDS), (d) noise/distortion cancellation, and e) post distortion. After extensive analysis, it has been found that noise/distortion cancellation and complementary derivative superposition (CDS) have the potential to deliver reliable wideband linearization. Furthermore, rather than using a single linearization technique, integrating many strategies can result in improved linearization.KeywordsWidebandLinearityLow-noise amplifierIIP2IIP3Complementary derivative superpositionPost distortionNoise cancellationFeedbackFeedforward
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