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    • 2. 发明申请
    • Frequency agile exciter
    • 频率敏捷激励器
    • US20050085194A1
    • 2005-04-21
    • US10689296
    • 2003-10-20
    • Ian RobinsonJack MacekFrank Winter
    • Ian RobinsonJack MacekFrank Winter
    • H03M3/00H04B1/02H04B1/04
    • H03M3/50H03M7/3017H03M7/3024
    • Systems and methods are provided for providing high dynamic range operation over a variable range of frequencies. A delta-sigma modulator, having associated frequency characteristics, produces a digital output signal. A digital-to-analog converter converts the digital output signal into an analog signal. A clock circuit provides a clock signal to the delta-sigma modulator and the digital-to-analog converter. A frequency control controls one or more of the clock circuit, the delta-sigma modulator, and the digital-to-analog converter to alter the frequency characteristics of the delta-sigma modulator. A filter circuit can provide one or more passbands to one or more downstream amplifiers ensuring that out of band quantization noise is removed before amplification.
    • 提供了用于在可变频率范围内提供高动态范围操作的系统和方法。 具有相关频率特性的Δ-Σ调制器产生数字输出信号。 数模转换器将数字输出信号转换为模拟信号。 时钟电路向Δ-Σ调制器和数模转换器提供时钟信号。 频率控制控制时钟电路,Δ-Σ调制器和数 - 模转换器中的一个或多个以改变Δ-Σ调制器的频率特性。 滤波器电路可以向一个或多个下游放大器提供一个或多个通带,确保在放大之前去除带外量化噪声。
    • 6. 发明授权
    • Delta-sigma digital-to-analog converter assembly
    • Delta-sigma数模转换器总成
    • US06963297B2
    • 2005-11-08
    • US10706723
    • 2003-11-12
    • Ian RobinsonFrank Winter
    • Ian RobinsonFrank Winter
    • H03F3/24H03M3/02H03M3/00
    • H03F3/24H03F2200/331H03M3/50H04B2001/0408
    • Systems and methods are provided for converting a digital signal into an analog signal. A digital-to-analog converter assembly comprises a delta-sigma modulator, a digital-to-analog converter, an analog filter, and a comb filter. The delta-sigma modulator processes a digital input signal to produce a digital output signal having at least one associated high dynamic range frequency band. The digital-to-analog converter converts the digital output signal into an analog output signal having at least one associated high dynamic range frequency band. The associated high dynamic range bands have respective frequency characteristics. An analog filter assembly filters the analog signal. The analog filter has at least one passband. A comb filter assembly attenuates the analog signal output of the filter assembly to improve signal to noise ratio.
    • 提供了将数字信号转换为模拟信号的系统和方法。 数模转换器组件包括Δ-Σ调制器,数 - 模转换器,模拟滤波器和梳状滤波器。 Δ-Σ调制器处理数字输入信号以产生具有至少一个相关联的高动态范围频带的数字输出信号。 数模转换器将数字输出信号转换为具有至少一个相关联的高动态范围频带的模拟输出信号。 相关联的高动态范围带具有相应的频率特性。 模拟滤波器组件对模拟信号进行滤波。 模拟滤波器至少有一个通带。 梳状滤波器组件衰减滤波器组件的模拟信号输出以提高信噪比。