LOW TO HIGHER IF CONVERSION FOR ACTIVE FILTERED LIMITED IF SYSTEM

摘要

To be more easy to process the signal from the receiver operating at a lower IF by the baseband system that operates at a higher IF, and a multi-conversion receiver using the current post -IF device continuously, the final IF stage prior to the improved receiver structure using a frequency transformation active filter for operating at a higher frequency than the IF stage is disclosed. The output low IF signal, to achieve a high IF more suitable for processing by a post -IF components, such as the detector is synthesized by dividing the local oscillation signal and the digitally. And combined signal is filtered by a low dynamic range active filter-limit (22).