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热词
    • 2. 发明授权
    • Method and circuit for achieving frequency conversion
    • 实现变频的方法和电路
    • US5924024A
    • 1999-07-13
    • US855416
    • 1997-05-13
    • Yuka IkedaYasunori Kanai
    • Yuka IkedaYasunori Kanai
    • H03D7/00H03C3/40H03D7/16H03D7/18H04B1/04H04B1/26H04B1/30H04Q9/12
    • H04B1/30H03C3/40H03D7/165H04B2001/0491
    • A frequency conversion method and a frequency conversion circuit which enlarge the frequency difference between the upper and lower sidebands of the output signal so as to enable the undesired sideband to be easily eliminated by a filter even in a case where the frequency of the input signal is low. First, a first excitation signal having a first excitation frequency (Fp) is modulated by an input signal (a) of a predetermined frequency (F1) to produce two sidebands and thereby generate a first intermediate signal (b). Next, a second excitation signal having a second excitation frequency (Fq) lower than the first excitation frequency (Fp) by exactly a frequency twice the frequency of the input signal (a) is modulated by the input signal (a) to produce two sidebands and thereby generate a second intermediate signal (c). Further the first intermediate signal (b) and the second intermediate signal (c) are added so that the lower sideband of the first intermediate signal (b) and the upper sideband of the second intermediate signal (c) are cancelled by each other to thereby generate an output signal (d) composed of the upper sideband of the first intermediate signal (b) and the lower sideband of the second intermediate signal (c). By this, the space between the upper sideband and the lower sideband is widened and thereby the lower band erasing filter can easily erase the lower sideband.
    • 一种频率转换方法和频率转换电路,其扩大了输出信号的上边带和下边带之间的频差,使得即使在输入信号的频率为 低。 首先,具有第一激励频率(Fp)的第一激励信号由预定频率(F1)的输入信号(a)调制以产生两个边带,从而产生第一中间信号(b)。 接下来,通过输入信号(a)调制具有低于第一激励频率(Fp)的第二激励频率(Fq)的精度为输入信号(a)的两倍的频率的第二激励信号,以产生两个边带 从而产生第二中间信号(c)。 此外,第一中间信号(b)和第二中间信号(c)相加,使得第一中间信号(b)的下边带和第二中间信号(c)的上边带彼此抵消,从而 产生由第一中间信号(b)的上边带和第二中间信号(c)的下边带组成的输出信号(d)。 由此,上边带和下边带之间的空间被加宽,从而下带消除滤波器可以容易地擦除下边带。