| 摘要 |
A device comprises a means (3) for generating a modulated signal (4) and a feedback control loop. The feedback control loop comprises a sensor (5) for providing a sensor signal (6) dependent on the generated signal (4), a sampler (7) for sampling the sensor signal (6), a measurer (61) for measuring the lapsed time (lapse)that has lapsed since a previous sampling, and a comparator (62) for comparing said lapsed time (lapse) to a reference time period (52). The feedback loop filter is made inoperative, if said lapsed time exceeds the reference time period, until such time as a next sampling is performed.
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