کنفرانس بین المللی میکروالکترونیک ایران

صفحه اصلی / هفتمین کنفرانس بین المللی میکروالکترونیک ایران

High-Linearity Ultra-Wideband Low-Noise Amplifier Using Derivative Superposition

نویسندگان :

Mohammadreza Kamjou¹ Abolfazl Rajaiyan² Seyed Mojtaba Atarodi³

1- دانشگاه صنعتی شریف 2- دانشگاه صنعتی شریف 3- دانشگاه صنعتی شریف

کلمات کلیدی :

Low Noise Amplifier،LNA،high linearity،ultra-wideband،derivative superposition

چکیده :

This paper presents an ultra-wideband (UWB) Low-Noise Amplifier (LNA) with enhanced linearity targeting RF receiver front-end applications. The proposed LNA employs a three-stage topology including a common-gate (CG) input stage for wideband input matching, a cascode gain stage for improved gain and isolation, and an output buffer to ensure proper output impedance matching. To address linearity challenges, the derivative superposition (DS) technique is implemented in the gain stage. This technique effectively reduced third-order intermodulation distortion. The amplifier achieves an S21 of approximately 12.9 dB and a Noise Figure (NF) of around 5 dB across the operating frequency band. The 3-dB bandwidth extends from 3.3 GHz to 9.5 GHz, making the design suitable for broadband Radio Frequency (RF) applications. Additionally, the LNA consumes 12.9 mW from a 1.2 V supply, which is favorable for UWB wireless systems. The combination of wide bandwidth, moderate gain, acceptable NF, and enhanced linearity makes this LNA a promising solution for modern high-frequency communication front-ends.