Parameter correction circuit and parameter correction method
AssigneePanasonic Corporation
InventorsTakahiro Bokui, Kazuhiko Nishikawa
Life of this patent
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Abstract
In a parameter correction circuit in an LSI, a reference resistor element with high precision having a resistance value set to a target value is connected to an external terminal of the LSI. A constant current from a mirror circuit connected to a current supply flows through the reference resistor element. A voltage value generated in the reference resistor element is measured by a voltage measuring circuit. The constant current also flows through a variable resistor element. The resistance value of the variable resistor element is adjusted so that a voltage generated in the variable resistor element corresponds to the voltage generated by the reference resistor element.
Claims2
A semiconductor integrated circuit comprising:
- a terminal to be connected to a reference parameter component having a known parameter value;
- a variable parameter component whose parameter value is controllable;
- a voltage measuring circuit to measure a voltage at the terminal and a voltage across the variable parameter component respectively;
- a current supply circuit configured to supply current to the terminal or to the variable parameter component;
- a first switching circuit between the current supply circuit and the terminal;
- and
- a second switching circuit between the current supply circuit and the variable parameter component, wherein
- an amount of the current supplied to the terminal is equal to an amount of the current supplied to the variable parameter component.
A semiconductor integrated circuit comprising:
- a terminal to be connected to a reference parameter component having a known parameter value;
- a variable parameter component whose parameter value is controllable;
- a voltage measuring circuit to measure a voltage at the terminal and a voltage across the variable parameter component respectively;
- a current supply circuit configured to supply current to the terminal or to the variable parameter component;
- a first switching circuit between the terminal and the voltage measuring circuit;
- and
- a second switching circuit between the variable parameter component and the voltage measuring circuit, wherein
- an amount of the current supplied to the terminal is equal to an amount of the current supplied to the variable parameter component.
Dependencies are inferred from the claim text.