Circuit arrangement
AssigneeInfineon Technologies AG
InventorAlbert Missoni
Life of this patent
Estimating the term…
Abstract
Circuit arrangement for demodulating a voltage which is ASK modulated by alternating the amplitude between a low and a high level. Respective charging voltages are produced on first and second charging circuits, with a decoupling device decoupling the first charging circuit at a prescribed ratio between the charging voltage from the second charging circuit and an input voltage for a rectifier circuit.
Claims19
A circuit arrangement for analog/digital conversion of a voltage which is ASK modulated by alternating the amplitude between a low and a high level, comprising:
- a rectifier circuit located downstream of a radio-frequency input;
- a first charging circuit and a second charging circuit which are connected in parallel to one another to an output of the rectifier circuit, wherein each of the first and second charging circuits produces a charging voltage;
- a decoupling device which decouples the charging voltages at a prescribed ratio between the respective charging voltages of an input voltage for the rectifier circuit;
- and
- an evaluation circuit which ascertains a level change from the ratio between the charging voltages,
- wherein the discharge and/or charging time of at least the first charging circuit is shortened when the input voltage is no longer within a voltage window defined by the respective charging voltages, and the discharge and/or charging time of at least the first charging circuit is lengthened when the input voltage is within the voltage window.
A circuit arrangement for analog/digital conversion of a voltage which is ASK modulated by alternating the amplitude between a low and a high level, comprising:
- a rectifier means located downstream of a radio-frequency input;
- a first charging means and a second charging means which are connected in parallel to one another to an output of the rectifier means, wherein each of the first and second charging means produces a charging voltage;
- a decoupling means which decouples the charging voltages at a prescribed ratio between the respective charging voltages of an input voltage for the rectifier means;
- and
- an evaluation means which ascertains a level change from the ratio between the charging voltages,
- wherein the discharge and/or charging time of at least the first charging circuit is shortened when the input voltage is no longer within a voltage window defined by the respective charging voltages, and the discharge and/or charging time of at least the first charging circuit is lengthened when the input voltage is within the voltage window.
A method for analog/digital conversion of a voltage which is ASK modulated by alternating the amplitude between a low and a high level, the method comprising the steps of:
- providing a rectifier circuit located downstream of a radio-frequency input;
- providing a first charging circuit and a second charging circuit which are connected in parallel to one another to an output of the rectifier circuit, wherein each of the first and second charging circuits produces a charging voltage;
- decoupling the charging voltages at a prescribed ratio between the respective charging voltages of an input voltage for the rectifier circuit;
- ai*4 ascertaining a level change from the ratio between the charging voltages;
- decreasing the discharge and/or charging time of at least the first charging circuit when the input voltage is no longer within a voltage window defined by the respective charging voltages;
- and
- increasing the discharge and/or charging time of at least the first charging circuit is lengthened when the input voltage is within the voltage window.
Dependencies are inferred from the claim text.