| 摘要 |
In a method and a device for carrying frequency synthesis, in particular in a distance measuring device based on the principle of evaluating the change over time in the phase of an electromagnetic radiation emitted by a radiation source and remitted by an object aimed at, a frequency, which is preferably furnished by a quartz oscillator, is regulated in a ring oscillator with N delay elements (V1, V2, V3, . . . , VN) to a desired first high frequency (F), which is used as a mixer frequency or as a modulation frequency. The signals at the N delay elements (V1, V2, V3, . . . , VN) are delivered to a multiplexer, which is switched over with a cadence that is equivalent to 2*N times the frequency of the low-frequency measurement signal to be evaluated. As a result, at the output of the multiplexer, a second high frequency (M) differing from the first high frequency (F) by the frequency of the low-frequency measurement signal is generated, which can be used as a modulation frequency or as a mixer frequency. A distance measuring device equipped with this kind of frequency synthesizer is distinguished by its simple design, small dimensions, and low energy consumption for generating the high frequencies.
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