Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Reexamination Certificate
2011-01-04
2011-01-04
Urban, Edward (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
C455S195100, C455S254000, C455S232100
Reexamination Certificate
active
07865157
ABSTRACT:
A heterodyne receiver has a mixer with at least one transistor whose operating point can be varied dynamically. The quality of the output signal from the mixer is assessed in order to control the operating point. The operating point is set such that the collector current is increased when the intermodulation interference is high, thus improving the intermodulation resistance. The collector current is reduced when the intermodulation interference is low, thus reducing the transistor noise. Furthermore, the current drawn is reduced in this situation. The circuit and the method are particularly suitable for RF receivers without tunable input filters, and for receivers in which the power consumption must be low.
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Datasheet MC13143/D, Rev. 0, 1997 “Advance Information, Ultra Low Power DC-2.4 GHz Linear Mixer” Published by Motorola, Inc. pp. 0-8.
Search Report Dated Dec. 15, 2004.
Clemens Klaus
Peusens Herbert
Cromarty Brian J.
Hannon Christian A
Opalach Joseph J.
Shedd Robert D.
Thomson Licensing
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