A high IIP2 Gilbert mixer-based downconverter design for direct-conversion WiMAX receivers

A 2.6 GHz Gilbert mixer-based downconverter RFIC is designed and implemented in a 0.15 ¿m InGaAs pseudomorphic high electron mobility transistor (pHEMT) foundry process. A crucial goal for the design is to achieve high input second-order intercept point (IIP2) that is required in a direct-conversion...

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Bibliographic Details
Main Authors: Wu, J.M., Ye, R.F., Horng, T.S.
Format: Conference Proceeding
Language:English
Subjects:
Calibration
Degradation
direct-conversion receiver
Electron mobility
Foundries
HEMTs
Indium gallium arsenide
Mixer
PHEMTs
Radio frequency
RF signals
second-order nonlinearity
WiMAX
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Summary:A 2.6 GHz Gilbert mixer-based downconverter RFIC is designed and implemented in a 0.15 ¿m InGaAs pseudomorphic high electron mobility transistor (pHEMT) foundry process. A crucial goal for the design is to achieve high input second-order intercept point (IIP2) that is required in a direct-conversion WiMAX receiver. The adaptive biasing at the switching stage of this downconverter is used to compensate the unbalance of the input LO signals for improving the IIP 2 . The technique presented here enhances the IIP 2 by 18.8 dBm without at the expense of reducing the conversion gain.
ISSN:2164-2958
2164-2974
DOI:10.1109/RWS.2010.5434233