| 摘要 |
Precision phase modulator (30) wherein a carrier signal of constant amplitude and frequency (a<uO>u cos //c t and a modulating signal (36) are applied to the two inputs of the first one of a cascade of linear suppressed-carrier amplitude modulators (34). Each subsequent modulator of the cascade arrangement concurrently modulates the output signal of the previous modulator of the cascade with the modulating signal. The input carrier signal and the output signal of each modulator of the cascade is tapped-off and weighted (38), the weighted carrier input and outputs of the even-numbered modulators and the weighted outputs of the odd-numbered modulators are separately added (40;42) and are combined in quadrature (18) to provide a phase modulated ouput signal. |
