Title:
BROADBAND INTEGRATED DIGITALLY TUNABLE FILTERS
Document Type and Number:
WIPO Patent Application WO2005020433
Kind Code:
A3
Abstract:
A tunable receiver is disclosed including a plurality of select filters to perform an initial band selection, a variable-gain low noise amplifier (LNA) whose gain is controlled to prevent its output power level to exceed a pre-determined power threshold, a plurality of digitally-tunable tracking filters to pass signals within a selected channel and to reject signals in a corresponding image band, a second LNA to further amplify the received RF signal and to generate differential signal outputs, a down converting stage which converts the received FR signal to an IF signal while rejecting signals in the image band, an IF trap to further reject undesired signals present at the output of the down converting stage, an IF amplifier to amplify the IF signal to compensate for losses, an IF filter to provide channel select and reject undesirable signals, and a variable-gain IF amplifier to amplify the IF signal and maintain its power level within specification.
Inventors:
WAIGHT MATTHEW GLENN (US)
BIRKELAND JOEL DAVID (US)
BIRKELAND JOEL DAVID (US)
Application Number:
PCT/US2004/025571
Publication Date:
April 07, 2005
Filing Date:
August 06, 2004
Export Citation:
Assignee:
MAXIM INTEGRATED PRODUCTS (US)
WAIGHT MATTHEW GLENN (US)
BIRKELAND JOEL DAVID (US)
WAIGHT MATTHEW GLENN (US)
BIRKELAND JOEL DAVID (US)
International Classes:
H03H7/01; H03H7/12; H03J1/00; H03J3/06; H03H7/40; (IPC1-7): H03H7/12
Foreign References:
| EP1282227A2 | 2003-02-05 | |||
| US5963856A | 1999-10-05 | |||
| EP1168608A2 | 2002-01-02 |
Other References:
See also references of EP 1661243A2
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