Telecommunications – Transmitter and receiver at same station – Transceiver controlling a separate transceiver or receiver
Reexamination Certificate
2007-07-10
2007-07-10
Urban, Edward F. (Department: 2618)
Telecommunications
Transmitter and receiver at same station
Transceiver controlling a separate transceiver or receiver
C455S076000, C455S260000, C455S553100
Reexamination Certificate
active
10631166
ABSTRACT:
Components of a radio-frequency (RF) apparatus including transceiver circuitry and frequency modification circuitry of a crystal oscillator circuit that generates a reference signal with adjustable frequency may be partitioned in a variety of ways, for example, as one or more separate integrated circuits. The frequency modification circuitry may be implemented as part of a crystal oscillator circuit that includes digitally controlled crystal oscillator (“DCXO”) circuitry and a crystal. The frequency modification circuitry may include at least one variable capacitance device and may be employed to generate a reference signal with adjustable frequency. The adjustable reference signal may be provided to other components of the RF apparatus and/or the RF apparatus may be configured to provide the adjustable reference signal to baseband processor circuitry. Automatic frequency control (AFC) circuitry may be integrated with other components of RF circuitry and may generate frequency control signals for the frequency modification circuitry based on, for example, a signal received from a temperature sensor. Digital-to-analog converter (DAC) circuitry may be integrated with other components of RF circuitry to enable all-digital frequency control communications from baseband processor circuitry to RF circuitry.
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Behrens Richard T.
Kerth Donald A.
Lim Lysander
Maligeorgos James
Marques Augusto M.
Lee John J.
O'Keefe, Egan Peterman & Enders LLP
Silicon Laboratories Inc.
Urban Edward F.
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