A High-Linearity Wideband Common-Gate LNA With a Differential Active Inductor

作者：Li Ma, Zhigong Wang, Jian Xu, Najam Muhammad Amin · 发表于：IEEE Transactions on Circuits & Systems II Express Briefs · 年份：2016 · DOI：10.1109/tcsii.2016.2572201 · 被引用次数：44 · 研究领域：Radio Frequency Integrated Circuit Design、Electromagnetic Compatibility and Noise Suppression、Acoustic Wave Resonator Technologies

A capacitor cross-coupled (CCC) wideband commongate low-noise amplifier (CGLNA) with improved linearity and frequency response is presented. A novel differential active inductor (AI) is designed to improve the in-band gain flatness and highfrequency gain using the gate-inductive gain-peaking technique. The AI prevents the small-signal current flowing to the ground through the gate-drain capacitors. The CCC technique improves noise performance and saves power. However, it will also increase nonlinear distortions due to the boosted signal amplitude. To overcome the CCC-induced linearity deterioration, the derivative superposition technique is employed by using two parallel input transistors biased at different regions. The measurement results of the fabricated prototype in a 0.18-μm CMOS process show that the voltage gain, the minimum noise figure, and the third-order intercept point are 16.9 dB, 2.5 dB, and 5.5 dBm, respectively, within the 3-dB bandwidth from 100 MHz to 1.45 GHz. The CGLNA consumes 9.3 mW from a 1.8-V supply and the active area is 0.29 × 0.26 mm2.