Time-measurement device for applications without power source
A time measurement, device technology, used in card-like identification or authentication devices, in the field of electrical components of real-time clock circuits, to solve problems such as not being continuously connected to a power source
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[0072] figure 1 A schematic simplified block diagram of a first embodiment of a time measuring device 100 is shown.
[0073] figure 1 The time measurement device 100 includes a timing reference circuit 102 . The timing reference circuit 102 has a MEMS resonator 104 . The structural details of the MEMS resonator will be further described below for illustrative examples. In general, such MEMS resonators are known in the prior art. The MEMS resonator 104 can be fabricated to provide specifications (regarding Q, frequency stability) equal or similar to those known from quartz resonators. MEMS resonators may be used in oscillator circuits such as oscillator circuit 106 to provide frequency stability and controllable oscillation frequencies in the range up to GHz.
[0074] Examples of suitable timing reference circuits connected to MEMS resonators are disclosed, for example, in WO 2008 / 033681A2, the entire content of which is incorporated herein. the document's figure 1 An...
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