Improvement of the linearity and conversion gain of an ultra wideband up-conversion mixer in CMOS 0.18 ?m technology

This paper presents a fully differential, low power and low voltage UWB up-conversion mixer, operating in the third channel of the ultra wideband range frequency (3-5GHz). Designed on CMOS 0.18 um technology and a voltage supply of 1.8, this circuit is based on a double balanced Gilbert topology, which uses a current injection method to increase the conversion gain and pi-inter-stage matching network formed of additional inductors to improve the linearity. Thus the mixer exhibits 10 dB conversion gain, 10 dBm IP3, a DC power in the range of 4.3 mW and can output an RF signal over the third channel of the low band (3-5) GHz frequency range.