A highly linear mixer design with a schottky diode linearizer for WiMAX applications

2.6 GHz mixers are designed and implemented in hybrid microwave circuits (HMCs) using the GaAs pseudomorphic high electron mobility transistors (pHEMTs). A crucial goal for the design is to achieve the high linearity required in WiMAX systems. The proposed design is based on a commonly used Gilbert...

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Bibliographic Details
Main Authors: Wu, J.M., Ye, R.F., Li, S.C.
Format: Conference Proceeding
Language:English
Subjects:
Electron mobility
Gallium arsenide
HEMTs
Linearity
Microwave circuits
Microwave transistors
MODFETs
PHEMTs
Schottky diodes
WiMAX
Online Access:Request full text
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Summary:2.6 GHz mixers are designed and implemented in hybrid microwave circuits (HMCs) using the GaAs pseudomorphic high electron mobility transistors (pHEMTs). A crucial goal for the design is to achieve the high linearity required in WiMAX systems. The proposed design is based on a commonly used Gilbert mixer with a Schottky diode linearizer to enhance the linearity. The input 1 dB compression point (IP 1dB ) and the third-order intercept point (IIP 3 ) of the proposed design achieve -3 dBm and 6.8 dBm, respectively. A Schottky diode linearizer has improved the IP 1dB by 3 dB and the IIP 3 by 3.8 dB without the reduction in conversion gain when compared to the conventional Gilbert mixer. Comparison between simulation and measurement shows good agreement in compensation of gain compression and IIP 3 due to a Schottky diode linearizer.
DOI:10.1109/EUMC.2007.4405274