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

作者：Ma, Li^*; Wang, Zhi-Gong; Xu, Jian; Amin, N. M.

来源：IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, 2017, 64(4): 402-406.

DOI：10.1109/TCSII.2016.2572201

• Active inductor (AI)
• capacitor cross couple (CCC)
• common gate
• derivative superposition (DS)
• low-noise amplifier (LNA)

Acapacitor cross-coupled (CCC) wideband common-gate 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 high-frequency 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-mu m CMOS process show that the voltage gain, the minimumnoise 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 x 0.26 mm(2).

• 出版日期2017-4
• 单位东南大学