| 摘要 |
Phase modulating systems and methods for modulating the phase of a signal are based on a digital control signal used to select one of a plurality of carriers having different phase angles. In order to reduce the number of short delays that have to be applied to the original signal for obtaining the plurality of carriers, it is proposed that delay elements are arranged in a matrix form. Alternatively, phase shifts are realized by digital frequency dividers instead of by delay elements. Further alternatively or in addition, part of the required delay is approximated or realized by an analog phase shifter. In case the phase modulating system is to be employed for modulating signals of different frequencies, the digital control signal is scaled with a factor associated to the respective frequency in order to change the addressing range for selecting a carrier from among the plurality of carriers.
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