An RF-LO current-bleeding doubly balanced mixer for IEEE 802.15.3a UWB MB-OFDM standard receivers

A new design of active mixers 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 both the RF and LO stages in order to improve further linearity and gain. Using an L-input matching and optimized device size, it was possible to obtain a good operation of the proposed mixer all over the 3.1–4.8 GHz band with AMS 0.35 m CMOS process parameters. The simulated conversion gain is 12.0–13.5 dBm, noise figure less than 8.8 dB, input IP3 above 0 dBm and a higher than -4dB of input return loss, when the power consumption is 18 mW under 3 V supply voltage.