his letter presents a low power, low noise CMOS
double-balanced direct conversion mixer for ultra-wideband
systems. The mixer is a critical block to perform the frequency
translation in ultra-wideband systems. The proposed mixer
employs three techniques: the sub threshold operation of
transistors for the radio frequency stage reduces current
dissipation in the overall mixer, a local oscillation (LO) stage
using an inverter lowers the required LO amplitude, and an
active load improves conversion gain. The mixer was
implemented using a 0.18 um CMOS process and was operated
from 3.1 to 5.7 GHz. The measured results show a high
conversion gain up to 22.0 dB and a maximum noise figure of
8.0 dB.In addition and a power dissipation of 5.535 mW from a
1.8 V supply
کلید واژگان :
CMOS integrated circuits, High gain, Low-noise amplifiers, Mixers, Ultra low powe
