A 3–6 GHz Current Reused Noise Canceling Low Noise Amplifier for WLAN and WPAN Applications

Abstract

A new ultra-wideband common gate low noise amplifier (LNA) for 3-6 GHz WLAN and WPAN applications is presented in which a current reused noise canceling structure utilized in the first stage not only provides a suitable noise performance, but also enhances the linearity characteristics of the LNA in a power efficient manner needed by WLAN/WPAN applications. The overall structure of the proposed LNA, consisting of three stages, namely input matching common gate stage with noise canceling, gain stage, and buffer one, is designed, laid out, and analyzed in 0.18 lm RF CMOS process. The LNA has a noise figure of 3.5-3.6 dB, a high and flat power gain of 20.27 ± 0.13 dB, and input and output losses of better than -11 and -14 dB, respectively, over the entire frequency band of 3-5 GHz, while these parameters are 3.5 dB, 20.75 ± 0.25 dB, -15 and -9 dB for the frequency band of 5-6 GHz, respectively. IIP2 and IIP3 of the proposed topology are equal to 25.9 and -1.85 dBm, respectively, at 4 GHz frequency. The proposed LNA has 15.3 mW power dissipation from a 1.8 V supply.

Design of Broadband CNFET LNA Based on Extracted I-V Closed-Form Equation

“…Beside the proper characteristics mentioned regarding the common-gate architecture, its noise performance is limited by the input matching condition due to fixing the device transconductance by the antenna output resistance. Therefore, noise reduction techniques are necessitated to be applied in order to improve the noise performance of CG LNAs for utilizing their wide bandwidth features [28]. There are some techniques to enhance the noise performance of the broadband LNAs (e.g., feedback and feedforward).…”

A High-Gain CNTFET-Based LNA Developed Using a Compact Design-Oriented Device Model

“…Nowadays, the increasing demand for wireless communication systems for broadband, multi-band, and multi-standard receivers makes the bandwidth a critical issue in the design of LNAs [22][23][24][25][26][27][28]. Large bandwidth systems exhibit desirable advantages, such as large transmission channel capacity, less multipath fading effect, and easier material penetration.…”