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    • 9. 发明公开
    • Variable frequency signal generator
    • 发电机mit variablem Frequenzsignal。
    • EP0423941A2
    • 1991-04-24
    • EP90310223.4
    • 1990-09-19
    • MARCONI INSTRUMENTS LIMITED
    • Owen, David PaulWells, John Norman
    • H03C3/09H03B23/00
    • H03C3/0991H03B23/00H03B2200/0092H03C3/06H03C3/0925H03C3/0933H03C3/0941H03C3/095H03C2200/0029H03C2200/005H03C2200/0079
    • A variable frequency signal generator includes a phase locked loop having a variable frequency oscillator (1) which has a control port to which a frequency determining signal is applied, the output of the oscillator being fed via a frequency divider (6) to a phase sensitive detector (7) where it is compared with a reference frequency signal, the result of said comparison being arranged to generate a comparison signal which is fed to a loop filter (9) which is coupled to said control port; and the signal generator including means for applying a frequency control signal thereto comprising a first path being arranged to adjust the division ratio of the frequency divider (6), and a second path including means for combining said frequency control signal and said comparison signal to produce said frequency determining signal; and calibration means (11-14) for adjusting the relative characteristics of said first and second paths to compensate for effects arising from tuning sensitivity dependence on frequency of said variable frequency generator (1).
    • 可变频率信号发生器包括具有可变频率振荡器(1)的锁相环,该可变频率振荡器(1)具有施加频率确定信号的控制端口,振荡器的输出经由分频器(6)馈送到相位敏感 检测器(7),其中与参考频率信号进行比较,所述比较的结果被布置为产生馈送到耦合到所述控制端口的环路滤波器(9)的比较信号; 并且所述信号发生器包括用于施加频率控制信号的装置,包括布置成调整分频器(6)的分频比的第一路径,以及包括用于组合所述频率控制信号和所述比较信号的装置的第二路径, 所述频率确定信号; 以及用于调节所述第一和第二路径的相对特性的校准装置(11-14),以补偿由所述可变频率发生器(1)的频率的调谐灵敏度所引起的影响。