IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
LETTER
A high linear broadband cascode LNA employing common-gate linearity enhancing technology
Zhichao ZhangMuhammad KhanAnh DinhLi Chen
Author information
JOURNAL FREE ACCESS

2013 Volume 10 Issue 23 Pages 20130603

Details
Abstract
This paper presents a low power, high linearity wideband cascode low noise amplifier (LNA) targeting the multi-standard wireless communication applications including LTE, GSM and Zigbee. Analyzing a cascode amplifier shows the common source (CS) stage is the main nonlinearity source for the LNA. The modified derivative superposition (MDS) technology is widely adopted to improve the linearity. In addition, when the operating frequency increases, the nonlinearity influence coming from the common gate (CG) increases and limits the linearity performance of the LNA. Based on the modified derivative superposition (MDS) technique, this work investigates the nonlinearity effects of the common gate (CG) stage on the cascode amplifier and employs both the derivative superposition (DS) and a terminal LC resonator on the CG stage. The nonlinearity coming from the CG stage is degraded in higher frequency and the high linear bandwidth is also increased. A cascode LNA was designed, analyzed, and implemented in the IBM 0.13-μm CMOS technology. The LNA achieved a third-order intercept point (IIP3) of +13.6dBm, 3dB NF and a 12dB gain in a wide frequency from 700MHz to 1.1GHz.
Content from these authors
© 2013 by The Institute of Electronics, Information and Communication Engineers
Previous article Next article
feedback
Top