Oscillator and telecommunications system with such an oscillator
AssigneeSwisscom Mobile AG
InventorRudolf Ritter
Life of this patent
Estimating the term…
Abstract
The oscillator integrated into a chip can generate an electrical clock signal with a reference signal, wherein the chip contains the following components: at least one laser transmitter, which can generate two coherent light signals with a differing optical transmission frequency, a coupler, in order to merge the two light signals, an electromagnetic converter, which can generate an electrical signal, whose frequency corresponds to the distance between the two transmission frequencies, a frequency divider, which can divide the frequency of the electrical signal in order to deliver a clock signal with a lower frequency. The oscillator can be inserted into a SIM card, for example, in order to make possible a non-falsifiable determination of the connection duration.
Claims23
A chipcard with an oscillator integrated into a chip, the oscillator being arranged to generate an electrical clock signal with a reference frequency,
- wherein said oscillator comprises the following components:
- at least one laser transmitter arranged to generate two coherent light signals with a differing optical transmission frequency,
- an electromagnetic converter arranged to convert the wave generated from an interference between the two said light signals into an electrical signal, and
- a frequency divider arranged to divide the frequency of said electrical signal in order to emit a clock signal with a lower frequency.
A billing method for billing a call of a subscriber identified with an identification card in a telecommunications network to the subscriber, comprising the steps of:
- determining the duration of the call using a time-measuring device integrated into the identification card, the time-measuring device comprising an integrated oscillator for generating an electrical clock signal with a reference frequency, the reference frequency being generated from an interference between two coherent laser signals, and the measured duration of the call being determined based on the reference frequency;
- and
- determining the amount to be billed based on the duration of the call measured with the time measuring device.
A chipcard comprising:
- an oscillator integrated into a chip, the oscillator including,
- means for generating two coherent light signals with a differing optical transmission frequency,
- means for converting the wave generated from an interference between the two said light signals into an electrical signal, and
- means for dividing the frequency of said electrical signal in order to emit a clock signal with a lower frequency.
Dependencies are inferred from the claim text.