Telecommunications – Transmitter and receiver at same station – With a common signal processing stage
Reexamination Certificate
2006-10-24
2006-10-24
Nguyen, Linh (Department: 2819)
Telecommunications
Transmitter and receiver at same station
With a common signal processing stage
C455S003010, C455S003060, C455S120000, C455S125000
Reexamination Certificate
active
07127217
ABSTRACT:
On-chip calibration signal generation circuitry is disclosed for filter tuning for radio-frequency communications and associated methods. On-chip circuitry generates a calibration signal that is used to help set a tuning control signal that is received by a tunable front-end filter. In one embodiment, local oscillator (LO) generation circuitry is used to generate the calibration signal. In operation of this embodiment, the LO generation circuitry is tuned to the desired receive channel, or to a frequency at some offset value from the desired receive channel, and the output of the LO generation circuitry is then used as a calibration input signal for a tunable front-end filter. This calibration signal is passed through the receive path circuitry, and the resulting signal is then analyzed to help set a tuning control signal for the tunable front-end filter.
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Kasha Dan B.
Tuttle G. Tyson
Nguyen Linh
O'Keefe Egan & Peterman, LLP
Silicon Laboratories Inc.
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