Low to higher if conversion for active filtered limited IF syste

Details Low to higher if conversion for active filtered limited IF syste Low to higher if conversion for active filtered limited IF syste

1997-11-14

2000-08-29

Bost, Dwayne D.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455314, 455308, H04B 126

Patent

active

061120650

ABSTRACT:
An improved receiver architecture utilizing active filters for frequency conversion, wherein the final IF stage operates at a frequency higher than the previous IF stage, is disclosed to facilitate the processing by a baseband system operating at higher IF of signals from receivers operating at lower IFs and to enable the continued use of existing post-IF devices with multiple-conversion receivers. A low IF signal output is digitally mixed with a divided local oscillator signal to achieve a higher IF which is suited for processing by post-IF components such as a detector. The mixed signal is then filtered by a low dynamic range active filter and limited.

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