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An Si-SiGe BiCMOS direct-conversion mixer with second-order and third-order nonlinearity cancellation for WCDMA applications

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2 Author(s)
Liwei Sheng ; Dept. of Electr. & Comput. Eng., Univ. of California, La Jolla, CA, USA ; Larson, L.E.

This paper presents a general analysis of the third-order nonlinearity of a differential common-emitter RF amplifier and an improved technique to cancel the third-order nonlinearity. A thorough analysis of the mechanisms leading to the second-order nonlinearity of bipolar double-balanced active mixers is also presented. An SiGe BiCMOS WCDMA direct-conversion mixer is designed based on the third- and the second-order cancellation schemes. The mixer achieves +6-dBm third-order input intercept point, +49-dBm second-order input intercept point, 16-dB gain and 7.2-dB double-sideband noise figure with only 2.2-mA current at 2.1 GHz.

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:51 ,  Issue: 11 )