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US 9,859,843 B2Granted
Device for controlling a capacitor having an adjustable capacitance
AssigneeSTMicroelectronics (Tours) SAS
InventorsSylvain Charley, Jerome Heurtier, Laurent Jeuffrault
Life of this patent
Estimating the term…
Abstract
A first capacitor has a capacitance adjustable to a set point value by application of a bias voltage. A second capacitor also has a capacitance adjustable to a set point value by application of a bias voltage. The first and second capacitors are arranged to receive the same bias voltage generated by a control circuit. The control circuit receiving the set point value as an input and generates that bias voltage in response to a quantity representative of a capacitance of the second capacitor.
Claims20
A device, comprising:
- a first capacitor having a capacitance that is adjustable to a set point value in response to application of a bias voltage;
- a second capacitor having a capacitance that is adjustable to a set point value in response to application of a bias voltage, wherein the first and second capacitors are configured to receive a same bias voltage;
- and
- a control circuit having an input to receive said set point value and configured to generate said bias voltage while taking into account a quantity representative of the capacitance of the second capacitor.
1 more element
A device, comprising:
- a first integrated circuit chip including:
- a first capacitor having a capacitance that is adjustable to a set point value in response to application of a bias voltage;
- and
- a second capacitor having a capacitance that is adjustable to a set point value in response to application of a bias voltage, wherein the first and second capacitors are configured to receive a same bias voltage;
- a reference capacitor;
- and
- a second integrated circuit chip including:
- a first oscillator circuit coupled to the second capacitor and configured to generate a first frequency varying according to the capacitance of the second capacitor;
- a second oscillator circuit coupled to said reference capacitor and configured to generate a second frequency fixed according to the capacitance of the reference capacitor;
- a frequency difference circuit configured to receive the first and second frequencies and generate a control signal indicative of a magnitude of a difference between the first and second frequencies;
- a bias generator circuit figured to output said bias voltage in response to said control signal.
8 more elements
Dependencies are inferred from the claim text.