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US 2019/0173426 A1Published application
Control of a quartz crystal oscillator frequency tuning array
AssigneesSTMicroelectronics (Grenoble 2) SAS, STMicroelectronics (Alps) SAS
InventorsBenoit MARCHAND, Francois DRUILHE
Life of this patent
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Abstract
A quartz crystal resonator is connected to an array of switchable capacitors or resistors. The switched actuation of elements of the array is controlled by bits of a control word. At least one of the bits of the control word is controlled by pulse width modulation to effectuate a tuning of the oscillation frequency of the quartz crystal resonator.
Claims21
A method, comprising:
- controlling switches of an array of switchable capacitors or resistors connected to a quartz crystal resonator with bits of a control word;
- wherein controlling comprises performing a pulse width modulation of at least one one bit of the control word to modulate a frequency of the quartz crystal resonator.
An electronic device, comprising:
- a circuit;
- and
- a quartz crystal resonator;
- and
- wherein the circuit is configured to implement a method for controlling switches of an array of switchable capacitors or resistors connected to a quartz crystal resonator with bits of a control word;
- wherein controlling comprises performing a pulse width modulation of at least one one bit of the control word to modulate a frequency of the quartz crystal resonator.
3 more elements
A circuit, comprising:
- a quartz crystal resonator having a first terminal and a second terminal;
- a first switchable capacitor circuit coupled between the first terminal and a reference node;
- a second switchable capacitor circuit coupled between the second terminal and the reference node;
- a control circuit configured to control operation of the first and second switchable capacitor circuits by applying a pulse width modulation signal to control a frequency of oscillation output from the quartz crystal resonator.
1 more element
Dependencies are inferred from the claim text.