发明名称 |
VERFAHREN ZUR STEUERUNG DER LADE- UND ENTLADEPHASEN EINES STÜTZKONDENSATORS |
摘要 |
A method for controlling the charging and discharging phases of a backup capacitor for a data storage medium has the step where the backup capacitor is first discharged to a defined voltage level before it is charged. The capacitor is discharged using a constant current. This ensures that the charging current for the backup capacitor cannot be used to identify what the charge-state of the capacitor was before discharging. Therefore, it is no longer possible to infer the currents that flowed during security-related arithmetic operations in a data processing unit. In one advantageous circuit configuration, a constant current source is formed by a current-mirror circuit, and a comparator is used to compare the voltage on the backup capacitor with a bandgap reference. |
申请公布号 |
AT289103(T) |
申请公布日期 |
2005.02.15 |
申请号 |
AT20010993048T |
申请日期 |
2001.11.06 |
申请人 |
INFINEON TECHNOLOGIES AG |
发明人 |
TSCHETERNIGG, SIEGFRIED;WEDEL, ARMIN |
分类号 |
H02J7/00;G06K19/07;G06K19/073;H02J1/00;(IPC1-7):G06K19/073;H02J9/06 |
主分类号 |
H02J7/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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