Telecommunications – Receiver or analog modulated signal frequency converter – Frequency conversion between signal source and receiver
Patent
1998-03-27
2000-07-11
Bost, Dwayne D.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency conversion between signal source and receiver
455326, 4552321, 455303, 455304, 455323, 455324, H04B 126
Patent
active
060885815
ABSTRACT:
A direct conversion receiver (DCR)(10) comprises amplitude modulated interference (AMI) nulling circuitry (32) for achieving enhanced cancellation of AMI. The AMI nulling circuitry (32) includes a first signal processor (42) and a second signal processor (44) for processing first and second differential output signals, respectively, from a mixer (24a). The first signal processor (42) includes an adjustable transfer function that is controlled by a controller (50). The controller (50) adjusts the transfer function of the first signal processor (42) to equalize the magnitudes of AMI components in the first and second differential output signals. The first and second differential output signals are then combined in a manner which cancels the equalized AMI components.
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Bickley Robert Henry
Pickett Michael Newton
Bogacz Frank J.
Bost Dwayne D.
Davis Temica M.
Motorola Inc.
Scott John C.
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