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    • 89. 发明公开
    • Receiver for RF signals comprising a pair of parallel signal paths
    • Empfängerfürradiofrequente Signale,der zwei平行的Signalwegeenthält。
    • EP0122657A1
    • 1984-10-24
    • EP84200436.8
    • 1984-03-27
    • Philips Electronics N.V.
    • Kasperkovitz, Wolfdietrich Georg
    • H03D1/24H04B1/30H04N5/44
    • H03D1/24H04B1/302H04N5/44
    • 0 The receiver comprises a pair of signal paths arranged in parallel between an RF-input (5) and a superposition circuit (8) and includes, arranged in succession, a pair of first mixing stages (1, 1') the signals from an RF-tuning oscillator (To), being applied in a phase quadrature relationship to these first mixing stages a pair of filtering elements (3, 3') for signal selection and a pair of second mixing stages(2,2'), the signals from a fixed LF-oscillator (Fo), being applied also in a phase-quadrature relationsip to these second mixing stages. The superposition circuit comprising an adding stage (8) arranged between outputs of the two signal paths and producing a first output signal (1). An amplitude and phase balance between the two signal paths is established by an amplitude and phase control of the signals in the two signal paths in dependence on the amplitude and phase of the image interference in the output signal of the superposition circuit.
      The amplitude of this image interference component is measured by detecting the image interference component phase-synchronously, the reference frequency being the detection carrier, and the phase of this image interference component is measured by detecting the image interference component synchronously by means of a detection carrier whose phase is shifted through 90° relative to the reference frequency. The of necessity equal frequency position between the reference frequency and its image interference component is obtained by means of frequency mirror-inversion.
    • 接收机包括并排布置在RF输入(5)和叠加电路(8)之间的一对信号路径,并且包括连续布置来自RF的信号的一对第一混合级(1,1分钟) 调谐振荡器(To)以相位正交关系施加到这些第一混合级,用于信号选择的一对滤波元件(3,3分钟)和一对第二混合级(2,2分钟),来自 固定的LF振荡器(Fo)也被应用到这些第二混合级的相位正交关系中。 所述叠加电路包括布置在所述两个信号路径的输出之间并产生第一输出信号(1)的加法级(8)。 根据叠加电路的输出信号中的图像干扰的幅度和相位,通过两个信号路径中的信号的幅度和相位控制来建立两个信号路径之间的幅度和相位平衡。 ...图像干扰分量的幅度通过相位同步检测图像干扰分量来测量,参考频率是检测载波,并且该图像干扰分量的相位是通过同步地检测图像干扰分量来测量的 检测载体的相对于参考频率偏移90°的装置。 通过频率镜反转获得参考频率与其图像干扰分量之间的等频位置的必要性。