A new linearization technique for CMOS RF mixer using third-order transconductance cancellation

Kung Hao Liang, Chi Hsein Lin, Hong Yeh Chang, Yi Jen Chan

研究成果: 雜誌貢獻期刊論文同行評審

63 引文 斯高帕斯(Scopus)

摘要

A new third-order transconductance (gm3) cancellation technique is proposed and applied to a conventional radio frequency (RF) mixer for improving circuit linearity. The bulk-to-source voltage is applied to adjust the peak value position of gm3. The cancellation of gm3 is utilized by a negative peak gm3 transistor combined in parallel with a positive peak gm3 transistor. For a single device, the measured adjacent channel power ratio (ACPR) and third-order intermodulation (IMD3) distortion are both improved over 15 dB. A Gilbert-cell mixer in commercial 0.18-μ m CMOS process was designed using the proposed method to further evaluate the linearity. The compensated gm3 device is placed in the input RF gm-stage and then reducing the principle nonlinearity source of the mixer. From the experiment results, the ACPR and IMD3 of the mixer are improved about 10 and 15 dB, respectively.

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文章編號4497814
頁(從 - 到)350-352
頁數3
期刊IEEE Microwave and Wireless Components Letters
18
發行號5
DOIs
出版狀態已出版 - 5月 2008

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