analysis and design of an active CMOS mixer with low non-linear effects second and third order

this paper the non-linear effects in the output of the synchronic mixer has fallen by using a transitional guidance class with low second and third-order distortion. Analysis of structure using Taylor nonlinear analysis led the some equations which make the optimum design of the circuit possible. Simulation results carried out in ADS simulator in 0.18um CMOS technology, show that in radio frequency of 900MHz, IIP2 and IIP3 values of the mixer which indicate linearity of the circuit, have improved by 16 dB and 6dB over the base model with the proposed method and the supply voltage provided in the mixer is approximately 1.8V. The results show that in the provided structure, the IIP2 and IIP3 have increased simultaneously while in other articles just one of the values of IIP2 or IIP3 increased or provided a structure in which the second and third order nonlinearity reduce at the same time but increment of the noise due to the addition of capacitors was one of their disadvantages which was solved in the proposed model. The results of the proposed and provided structures are investigated for 4 mA bias current. Compared with previous models, the main advantages of this structure are the simultaneous increase of IIP2 and IIP3 and low power.

Keywords:

Second and third order nonlinear effects , IM2 , IM3 , IIP2 , IIP3 , Gilbert Cells