Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Reexamination Certificate
2007-03-01
2010-11-23
Le, Thanh C (Department: 2618)
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
C455S552100
Reexamination Certificate
active
07840191
ABSTRACT:
A small size, low cost balun is formed on a substrate, such as gallium arsenide, as an integrated passive device. Multiple baluns are formed on a same substrate, allowing multi-band operation. For example, symmetrical transformers are provided for two different bands of operation, such as for a quad-band GSM application. Each of the two different baluns is used for two different frequency bands of operation of the quad-band device. A ground ring allows two Hi-Q baluns to be formed on the same integrated circuit side-by-side with minimum spacing and minimum impact on phase and amplitude performance over the frequency bands of operation. By using multiple integrated circuit baluns on a same substrate or chip, the size and cost of baluns for multi-band operation may be reduced.
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