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    • 2. 发明授权
    • Radio frequency modulator
    • 射频调制器
    • US07136626B2
    • 2006-11-14
    • US10071919
    • 2002-02-08
    • Biagio BisantiStefano CiprianiEric Duvivier
    • Biagio BisantiStefano CiprianiEric Duvivier
    • H04B1/02H04B1/04
    • H03C3/0983H03C3/0966
    • A transmitter architecture (200) provides for a stable and low noise modulator where the modulation bandwidth is uncorrelated to the TX loop bandwidth. The output signal (228) of the TX loop is demodulated by a demodulator (208) and the demodulated signal is compared by a comparator (206) with the modulating input signal (202). The output of the comparator is then used to adjust a digital pre-emphasis filter (204) which preconditions the modulating input signal (202) in the digital domain. The preconditioning approach of the present invention provides for low noise because the transmitter designer can chose a narrow band for the TX loop which will also filter out the noise coming from the additional synthesizer (226) used to down convert the input signal.
    • 发射机架构(200)提供稳定和低噪声调制器,其中调制带宽与TX环路带宽不相关。 TX环路的输出信号(228)由解调器(208)解调,并且解调信号由比较器(206)与调制输入信号(202)进行比较。 然后比较器的输出用于调整预编码数字域中的调制输入信号(202)的数字预加重滤波器(204)。 本发明的预处理方法提供低噪声,因为发射机设计者可以为TX环路选择窄带,其也将滤除来自用于下变频输入信号的附加合成器(226)的噪声。