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Post-Linearization Technique of CMOS Cascode Low Noise Amplifier Using Dual Common Gate FETs  

Huang, Guo-Chi (School of Information and Communication Engineering, Sungkyunkwan University)
Kim, Tae-Sung (School of Information and Communication Engineering, Sungkyunkwan Univresity)
Kim, Seong-Kyun (School of Information and Communication Engineering, Sungkyunkwan University)
Kim, Byung-Sung (School of Information and Communication Engineering, Sungkyunkwan University)
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Abstract
A novel post-linearization technique is proposed for CMOS cascode low noise amplifier (LNA). The technique uses dual common gate FETs one of which delivers the linear currents to a load and the other one sinks the $3^{rd}$ order intermodulation currents of output currents from the common source FET. Selective current branching can be implemented in $0.18{\mu}m$ CMOS process by using a thick oxide FET as an IM3 sinker with a normal FET as a linear current buffer. A differential LNA adopting this technique is designed at 2.14GHz. The measurement results show 11dBm IIP3, 15.5dB power gain and 2.85dB noise figure consuming 12.4mA from 1.8V power supply. Compared with the LNA with turning off the IM3 sinker, the proposed technique improves the IIP3 by 7.5 dB.
Keywords
CMOS LNA; Post-linearization; Intermodulation; IIP3;
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