2009 Volume 6 Issue 13 Pages 930-935
This paper presents a low voltage highly linear CMOS up conversion mixer based on current conveyor (CCII), which converts an input of 100MHz IF signal to an output of 2.4GHz RF signal. The linearity of the designed mixer is greatly enhanced by utilizing a fully differential current conveyor. The flipped voltage follower (FVF) technique is applied for decreasing the current conveyor nonideality and the nonlinear output resistance of its buffer. Folded cascode structure has been used in the proposed mixer to achieve low supply voltage operation and separate biasing current of local oscillator (LO) switching and transconductance stages of mixer for decreasing the noise level of switching pairs. Full transistor level simulation results performed by Cadence in AMS 0.35µm CMOS technology reveal high linearity of the proposed mixer after a FOM-based comparison which has achieved up to 13.32dBm IIP3, -1.34dBm P-1dB and 96.7dBm IIP2 with a conversion gain of 4.2dB while consumes only 1.2mW at supply voltage of 1V.