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    • 6. 发明授权
    • Apparatus and method for dynamically clocking a loop filter in a digital communications device
    • 用于在数字通信设备中动态计时环路滤波器的装置和方法
    • US07433657B2
    • 2008-10-07
    • US11268798
    • 2005-11-08
    • Paul Cheng-Po LiangRajesh D. Patel
    • Paul Cheng-Po LiangRajesh D. Patel
    • H04B1/16
    • H04L27/12H04L27/20
    • A transmitter has a signal generator, an amplifier, a detection circuit, a comparison circuit, a loop filter, and an adjustable clock. The signal generator produces a signal. The signal is produced with a first frequency characteristic and contains frequency-related information. The detection circuit detects the first frequency-related characteristic and generates an associated signal in response. A comparison circuit compares the signal from the detection circuit and another signal. It outputs a signal associated with the difference between the two. A loop filter receives the output of the comparison circuit and generates a signal to the signal generator in. The loop filter is clocked at a second frequency by a signal from a clock circuit. The clock circuit can compare the first frequency and the second frequency, and can change the second frequency based upon a relationship between the two frequencies.
    • 发射机具有信号发生器,放大器,检测电路,比较电路,环路滤波器和可调节时钟。 信号发生器产生信号。 该信号产生具有第一频率特性并且包含频率相关信息。 检测电路检测第一频率相关特性并产生响应的相关信号。 比较电路将来自检测电路的信号与另一信号进行比较。 它输出与两者之间的差异相关联的信号。 环路滤波器接收比较电路的输出并产生信号到信号发生器。环路滤波器以来自时钟电路的信号以第二频率被计时。 时钟电路可以比较第一频率和第二频率,并且可以基于两个频率之间的关系来改变第二频率。