用正交相加方法把失真降到最小值。以100兆赫的工作试样来说明原理。其分析可推广运用到x波段以上。在移动式调频发射机、宇宙通信应答机和试验设备中要求低失真调相器。这里所述的调相器在偏移达±45°时可把相位的线性保持在0.4％以内。这种调相器的基本原理,是利用调制信号控制电阻把两个相位相差90°的等幅正弦信号相加。虽然这一设想看来非常简单, Use quadrature summation to minimize distortion. The 100 MHz working sample is used to illustrate the principle. Its analysis can promote the use of x-band above. Low-distortion phase modulators are required in mobile FM transmitters, space communications transponders and test equipment. The phase modulator described here maintains a linear phase of 0.4% or less when offset by ± 45 °. The basic principle of this phase modulator is to add two equal-amplitude sinusoidal signals that are 90 ° out of phase with the modulated signal control resistor. Although this vision seems very simple,