Telecommunications – Receiver or analog modulated signal frequency converter – With particular receiver circuit
Reexamination Certificate
2008-05-26
2011-12-06
Nguyen, Duc M (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
With particular receiver circuit
C455S340000, C455S341000, C455S191100, C330S302000, C330S305000
Reexamination Certificate
active
08073419
ABSTRACT:
A front-end circuit with coherent tunable filters is provided. The circuit includes a first filter, an amplifier, and a second filter. The amplifier is coupled to the first filter, and the second filter is coupled to the amplifier. Furthermore, the amplifier is placed between the first and second filters. The first filter has a first tunable intermediate frequency, and is used to filter a received signal. The amplifier is used to amplify the output of the first filter. The second filter has a second tunable intermediate frequency, and is used to filter the output of the amplifier. The first and second intermediate frequencies have a coherent-tuning relation with each other.
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“1st Office Action of China Counterpart Application”, issued on Dec. 1, 2010, p. 1-p. 5.
Kuo Chien-Nan
Pang Yi-Hsin
Shih Horng-Yuan
Industrial Technology Research Institute
Jianq Chyun IP Office
National Chiao Tung University
Nguyen Duc M
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