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    • 15. 发明申请
    • On-chip calibration signal generation for tunable filters for RF communications and associated methods
    • 用于RF通信和相关方法的可调谐滤波器的片上校准信号生成
    • US20060001559A1
    • 2006-01-05
    • US11081959
    • 2005-03-16
    • G. TuttleDan Kasha
    • G. TuttleDan Kasha
    • H03M1/10
    • H04B1/18H04B1/30
    • 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.
    • 公开了用于射频通信和相关方法的滤波器调谐的片上校准信号产生电路。 片上电路产生校准信号,用于帮助设置由可调谐前端滤波器接收的调谐控制信号。 在一个实施例中,使用本地振荡器(LO)产生电路来产生校准信号。 在本实施例的操作中,LO产生电路被调谐到期望的接收信道,或者被调谐到来自期望的接收信道的某个偏移值的频率,然后将LO产生电路的输出用作校准输入信号 可调谐前端滤波器 该校准信号通过接收路径电路,然后对结果信号进行分析,以帮助设置可调谐前端滤波器的调谐控制信号。
    • 18. 发明申请
    • PARTITIONING OF RADIO-FREQUENCY APPARATUS
    • 无线电频率设备的分配
    • US20070054629A1
    • 2007-03-08
    • US10730404
    • 2003-12-08
    • James MaligeorgosAugusto MarquesLysander LimG. TuttleAslamali RafiTod PaulusGregory UeharaJeffrey ScottRichard BehrensDonald KerthG. VishakhadattaVishnu SrinivasanCaiyi Wang
    • James MaligeorgosAugusto MarquesLysander LimG. TuttleAslamali RafiTod PaulusGregory UeharaJeffrey ScottRichard BehrensDonald KerthG. VishakhadattaVishnu SrinivasanCaiyi Wang
    • H04B1/38
    • H04B1/30H03J2200/10H04L27/0002
    • 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.
    • 包括生成具有可变频率的参考信号的晶体振荡器电路的收发器电路和频率修改电路的射频(RF)设备的组件可以以各种方式被划分,例如作为一个或多个单独的集成电路。 频率修改电路可以被实现为包括数字控制的晶体振荡器(“DCXO”)电路和晶体的晶体振荡器电路的一部分。 频率修改电路可以包括至少一个可变电容器件,并且可以用于产生具有可调频率的参考信号。 可调参考信号可以被提供给RF装置的其他部件,和/或RF装置可以被配置为向基带处理器电路提供可调参考信号。 自动频率控制(AFC)电路可以与RF电路的其它组件集成,并且可以基于例如从温度传感器接收的信号来生成用于频率修改电路的频率控制信号。 数模转换器(DAC)电路可以与RF电路的其他部件集成,以实现从基带处理器电路到RF电路的全数字频率控制通信。