| 摘要 |
A sequence generator 10 for a frequency synthesiser 1,2,3,4,5,10 forming part of a direct modulator comprises an input 10a for receiving an input multibit signal X(z), an output 10c for outputting an output digital signal Y(z) and sequence generation means 10b. The sequence generation means is adapted to produce a noise transfer function which has a minimum value both at the frequency corresponding to the dc component of the input signal and at one or more frequencies away from the frequency corresponding to the dc component of the input signal.
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