RF microelectronics
A 65 nm CMOS low power RF front-end for L1/E1 GPS/Galileo signals
Proceedings of the 21st edition of the great lakes symposium on Great lakes symposium on VLSI
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In RF receivers, many interferers accompany the desired signal in its entrance to the front end of the receiver. Of particular interest out of these interferes is the image, which if downconverted with the desired signal by the same local oscillator, severely corrupts the received information. In low IF receivers, the image can only be eliminated after the downconversion by several means, one of which is using a polyphase filter. This paper discusses available current solutions and then introduces a new low power high dynamic range polyphase filter built with the commercially available Plus-Type Second Generation Current Conveyors (CCII+). SPICE simulation results show that image rejection of 15dBs can be achieved using only one stage of this filter.