Design Optimization Methodology of CMOS Active Mixers for Multi-Standard Receivers

A design flow of multi-standard down-conversion CMOS mixers for three modern standards: Global System Mobile, Digital Enhanced Cordless Telephone and Universal Mobile Telecommunication Systems is presented. Three active mixer-s structures are studied. The first is based on the Gilbert cell which gives a tolerable noise figure and linearity with a low conversion gain. The second and third structures use the current bleeding and charge injection techniques in order to increase the conversion gain. An improvement of about 2 dB of the conversion gain is achieved without a considerable degradation of the other characteristics. The models used for noise figure, conversion gain and IIP3 used are studied. This study describes the nature of trade-offs inherent in such structures and gives insights that help in identifying which structure is better for given conditions.

Authors:

• S. Douss
• F. Touati
• M. Loulou

Keywords:

• Active mixer
• Radio-frequency transceiver
• Multistandardfront end
• Gilbert cell
• current bleeding
• charge injection.

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