A New Linearization Technique for CMOS RF Mixer Using Third-Order Transconductance Cancellation
A new third-order transconductance (g m3 ) 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 gms. The cancellation of g m3 is utilized by a negative...
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Published in | IEEE microwave and wireless components letters Vol. 18; no. 5; pp. 350 - 352 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
New York, NY
IEEE
01.05.2008
Institute of Electrical and Electronics Engineers |
Subjects | |
Online Access | Get full text |
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Summary: | A new third-order transconductance (g m3 ) 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 gms. The cancellation of g m3 is utilized by a negative peak g m3 transistor combined in parallel with a positive peak g m3 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-mum CMOS process was designed using the proposed method to further evaluate the linearity. The compensated g m3 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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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1531-1309 1558-1764 |
DOI: | 10.1109/LMWC.2008.922129 |