Active continuous-time filter with increased dynamic range in the presence of blocker signals

摘要

An active filter is disclosed with improved blocker signal rejection characteristics. Linear resistors, such as fixed value resistors are used at the input stage of the filter to suppress any blocker signal. A gain compensation stage is added to the output stage using resistors fabricated with the same technology used to fabricate the input resistors in order to offset any gain changes associated with the input fixed value resistors. In an exemplary embodiment, the fixed value resistors are fabricated using polysilicon.