From the simulation results, it is found that the proposed LNA achieves a gain (S21) of 14.6 dB, Noise Figure (NF) of 2.9 dB, Input matching (S11) of −15 dB and third order Input Intercept Point (IIP3) of +4.19 dBm. In order to evaluate the efficacy of this approach, the proposed LNA is designed and implemented in UMC 0.18 µm MMRF CMOS process for 2.44 GHz. In this paper to achieve high linearity for the gm-boosting FC LNA, MDS technique is incorporated at the Common Source (CS) stage and is proposed. To improve the linearity of the LNAs, several techniques namely Harmonic Termination Network, Derivative Superposition, Modified Derivative Superposition (MDS) techniques are reported in the literature. Under low voltage operation, linearity of the LNAs is degraded due to transconductance and drain conductance nonlinearities. A FC LNA with gm-boosting technique is reported in the literature. A new inventive LNA model is presented in this work to improve the linearity with a little sacrifice in gain.įolded Cascode (FC) Low Noise Amplifier (LNA) is preferred for low voltage and low power RF applications. With identified limitations of modified derivative superposition method, the simulated results are compared and summarized with the reported literature. Derivative and modified derivative superposition methods are well known for offering more linearity in LNAs. Hence overall second- and third-order nonlinearity contribution should be suppressed to increase the performance of the LNA.

Second-order interaction with the fundamental frequency contributes to intermodulated components, which intern increases the overall nonlinearity. Interaction of higher-order harmonics and intrinsic second-order nonlinearities distorts the fundament frequency components. In realistic scenario, more than one interferer is going to interfere with the fundamental component causing intermodulation distortion. As the first block in receiver, the LNA must be sufficiently linear to suppress interference due to intermodulation distortion and maintain high sensitivity.

Devices operating in the 2.4 GHz range include Bluetooth devices, cordless telephones, some radio equipment and wireless keyboards. RF devices using 802.11b/g/n experience interference from other products operating in the 2.4 GHz band. Linearity plays an important role in RF systems because nonlinearity issues comprise harmonic distortion, gain compression, cross modulation and intermodulation, etc.

Gm helper 2.4 3