Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Reexamination Certificate
2006-08-29
2006-08-29
Urban, Edward F. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
C455S217000, C455S293000, C455S333000, C329S306000, C329S318000, C331S018000, C331S063000
Reexamination Certificate
active
07099647
ABSTRACT:
A single chip direct conversion transceiver that includes a substrate on which a mixer unit and a local oscillator are provided as a circuit, and a positive hole formed between the mixer unit and the local oscillator and filled with a conductive plug to block signal leakage. A shield ground surface is formed above the substrate and blocks signal leakage occurring when the signals received through the antenna are input into the mixer and signal leakage occurring when the reference signal is input into the mixer from the local oscillator. A first interconnection is formed above the shield ground surface and connects the mixer unit and the local oscillator. Dielectric layers are formed between the substrate and the shield ground surface and on the shield ground surface to cover the first interconnection.
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Sekiguchi et al., “Ultra Small Sized Low Noise Block Downconverter Module”, Jun. 1, 1992.
Jeff Durec, “An Integrated Silicon Bipolar Receiver Subsystem for 900MHz Band Applications”, Sep. 28, 1997.
Park Jong-ae
Woo Sang-hyun
Dilworth & Barrese LLP
Nguyen Thuan T
Urban Edward F.
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