Design of high gain 2.4GHz CMOS LNA amplifier for wireless sensor network applications

Abstract

Wireless Sensors Networks (WSNs) are being widely deployed in various applications, such as in monitoring environment conditions and in security systems. However, the device size, low cost and low energy are the main problems in the design of WSNs. In this paper, a high gain CMOS LNA for 2.4 GHz WSN application is proposed and simulated in 0.18 um CMOS technology. A novel energy efficient technique along with the current bleeding PMOS devices is employed to improve both the NF and power gain of the LNA design. Furthermore, the folded cascade is improved by combining the Partial Source Degeneration (PSD), shunt feedback and boosting inductor. Simulation results show that the proposed LNA approach outperforms the conventional fold cascode LNA in terms of gain (S21) and NF. Also, the proposed LNA achieves a forward gain of 31 dB with a NF of 2.66 dB, while drawing 9.75 mW from a 1V source supply; and a linearity Input Third-Order Intercept Point (IIP3) of −2.5 dBm.