Baseband I/Q regeneration method for direct conversion receiver to nullify effect of second order intermodulation distortion

Direct Conversion Receiver is the choice of the today's designer for design of low power and compact wireless receiver. Direct Conversion Receiver is attractive due to low power, small size and highly monolithic integratable structure, but distortions affect its performance. Second order Intermodulation distortion is the one of the major distortion which is responsible for performance degradation. In this paper, a novel method for Direct Conversion Receiver is suggested, which makes it insensitive to the Second order Intermodulation distortion. Results demonstrate that proposed method is able to remove Second-Order Intermodulation distortion effectively and improve adjacent channel rejection by 10dB. Here the classical homodyne architecture is modified to nullify effect of Second order Intermodulation distortion. The proposed method can be implemented in the Digital Signal Processing (DSP) back-end section also. This feature makes it acceptable in the already designed/functioning classical homodyne architecture based receiver.