N-PATH FILTER WITH IMPROVED OUT-OF-BAND REJECTION

摘要

An N-path filter (500) comprising an input port (502), an output port (504) and a plurality of paths (506-1, 506-2,..., 506-N), wherein each path comprises: a low pass filter circuit (508-1, 508-2,..., 508- N); a first switching circuit (510-1, 510-2,..., 510-N) which, when activated, connects the input port of the filter to the low pass filter circuit; and a second switching circuit (512-1, 512-2,..., 512-N) which, when activated, connected the output port of the filter to the low pass filter circuit. The first switching circuits of the plurality of paths are activated in sequence and the second switching circuits of the plurality of paths are activated in the same sequence.