This paper represents a high performance wideband CMOS direct down-conversion mixer for UWB based on 0.18 µm CMOS technology. The proposed mixer uses the current bleeding technique and an extra resonant inductor to improve the conversion gain, noise figure (NF) and linearity. Also, with an extra inductor and the careful choosing of transistor sizes, the mixer has a very low flicker noise. The shunt resistor matching is applied to have a 528MHz bandwidth matching at 50 Ohm. The simulation results show the voltage conversion gain of 20.5 dB, the double-side band NF of 5.6 dB. Two-tone test result indicates 11.25 dBm of IIP3 and higher than 70 dBm of IIP2. The circuit operates at the supply voltage of 1.8 V, and dissipates 11.5 mW.
In this paper, a new image rejection mixer in heterodyne architecture for 2 GHz band applications based on 0.18 /lm CMOS technology is presented_ The designed mixer uses a LC T-structure filter to suppress the image signal, leading to the improvements in the noise figure (NF) and conversion gain. An image rejection ratio of 25-52 dB is obtained in a 150 MHz of bandwidth from 1.95 to 2.IGHz with IF varying from 200 to 350M Hz. The simulation results show single-side band (SSB) NF of 3.2 dB improved by 2.4 dB, the conversion gain of 13.4 dB, improved by more than 1.4 dB. The tirf;uit operates at the supply voltage of 1.8 V, and dissipates 12 mW.
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