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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

Inactive Publication Date: 2011-06-15
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many of these applications, such as RFID tags and identification cards, bank cards, etc., are usually not continuously connected to a power source

Method used

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  • Time-measurement device for applications without power source
  • Time-measurement device for applications without power source
  • Time-measurement device for applications without power source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[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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PUM

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Abstract

The present invention relates to a time-measurement device comprising a timing-reference circuit on a single substrate or on multiple substrates; a source of radioactive radiation on or in the substrate; and a counter for radioactive decay events on or in the substrate. A control circuit on the substrate is configured to control the integration time of the counter using the timing reference, receive the count signal from the counter, and calculate a time difference between a momentaneous time and a reference time using the count signal, the value of the integration time span, the half life, and a known decay rate of the at least one radioisotope at the reference time.

Description

technical field [0001] The invention relates to a time measuring device, a real time clock, and to an electrical assembly comprising a real time clock circuit. The invention also relates to a card-like identification or authentication device and to a method for measuring time relative to a reference time. Background technique [0002] The use of radioactive decay to measure time in integrated circuits is known in the art, eg US4,676,661. The time measuring device disclosed in US 4,676,661 is intended to replace quartz oscillator based time measurement by periodically providing an electrical signal to count time in seconds by counting radioactive decays up to a preset number of decay counts. Although US4,676,661 is in Figure 5 Calculation of time elapsed since manufacture is also contemplated in embodiments, but this time calculation is only performed with year precision. [0003] Time measurement has received attention for incorporation into many other application devices...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04F13/00
CPCG04F5/16
Inventor 彼得・杨・什利克维尔约瑟夫・托马斯・马丁内斯・范贝克帕维尔・穆夏尔
Owner NXP BV
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