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A design of active mixer intended for the "mode 1" of ultra wideband multi-band OFDM receivers is presented. It is based on a doubly-balanced Gilbert cell type in which bleeding current sources are added in order to improve linearity and gain. Using an adequate input matching network and optimized device size, it was possible to obtain a good operation of the proposed mixer all over the...
A design of active mixer intended for the "Mode 1" of ultra wideband multi-band OFDM receivers is presented. It is based on a doubly-balanced Gilbert cell type in which bleeding current sources are added in order to improve linearity and gain. Using an adequate input matching network and optimized device size, it was possible to obtain a good operation of the proposed mixer all over the...
A novel CMOS mixer topology aimed for the 'Model' bands of Ultra Wideband Orthogonal Frequency Division Multiplexing (UWB-OFDM) applications is proposed. This topology uses two bleeding sources to increase linearity and gain without affecting the other circuit performances. Using an L-input matching and optimized devices, it was possible to obtain a good operation of the proposed mixer all over the...
The design of multi-standards CMOS mixers is presented in this paper. The front-end is designed to be operational for three standards at the same time: Global System Mobile (GSM), Digital Enhanced Cordless Telephone systems (DECT) and Universal Mobile Telecommunication System (UMTS). The required specifications for those standards are: a noise figure NF < 10dB, a -1dB compression point CP1 <...
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