Barium-strontium-titanium (BST) capacitor configuration method
AssigneeSTMicroelectronics (Tours) SAS
InventorSylvain Charley
Life of this patent
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Abstract
A capacitor has a variable capacitance settable by a bias voltage. A method for setting the bias voltage including the steps of: (a) injecting a constant current to bias the capacitor; (b) measuring the capacitor voltage at the end of a time interval; (c) calculating the capacitance value obtained at the end of the time interval; (d) comparing this value with a desired value; and (e) repeating steps (a) to (d) so as long as the calculated value is different from the set point value. When calculated value matches the set point value; the measured capacitor voltage is stored as a bias voltage to be applied to the capacitor for setting the variable capacitance.
Claims15
A method of configuring a settable capacitance of a capacitor, comprising the steps of:
- (a) biasing the capacitor for a time interval;
- (b) calculating a capacitance value of the capacitor at the end of the time interval;
- (c) comparing the calculated capacitance value with a desired capacitance value;
- (d) repeating steps (a) to (c) with a different biasing of the capacitor if the calculated capacitance value differs from the desired capacitance value;
- and
- (e) if the calculated capacitance value does not differ from the desired capacitance value, then measuring a capacitor bias voltage at the end of the time interval and storing a value of the measured capacitor bias voltage as a bias voltage to be applied to the capacitor for configuring the settable capacitance of the capacitor.
A method, comprising the steps of:
- (a) biasing a control input of a Barium-Strontium-Titanium (BST) variable capacitor;
- (b) determining a capacitance value of the BST variable capacitor as a function of said biasing;
- (c) determining if the determined capacitance value matches a desired capacitance value;
- and
- (d) if yes from step (c), storing a bias voltage value of said biasing for application to the control input of the BST variable capacitor so as to set a variable capacitance of the BST variable capacitor.
Dependencies are inferred from the claim text.