Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Reexamination Certificate
2007-11-06
2007-11-06
Anderson, Matthew (Department: 2618)
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
C455S073000, C455S079000, C455S082000, C455S083000
Reexamination Certificate
active
10975375
ABSTRACT:
In an input/output circuit (200), a differential balun (250) is provided that has first and second balun inputs and first and second balun outputs. An antenna (230) is connected to the first and second balun outputs. A differential amplifier (220) has one output connected to the first balun input, and a second output connected to the second balun input, while a single-ended amplifier (110) has its input connected to the first balun input. A grounding switch (240) is connected between the second balun input and ground. During a transmit mode the grounding switch (240) is open, the differential amplifier (220) is turned on, and the single-ended amplifier (110) is turned off. During a receive mode the grounding switch (240) is closed, the differential amplifier (220) is turned off, and the single-ended amplifier (110) is turned on.
REFERENCES:
patent: 2004/0124944 (2004-07-01), Nation
patent: 2004/0232982 (2004-11-01), Ichitsubo et al.
patent: 2004/0253939 (2004-12-01), Castaneda et al.
patent: 2005/0215205 (2005-09-01), Rofougaran
Anderson Matthew
Freescale Semiconductor Inc.
Pham Tuan
LandOfFree
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