Oscillator calibrated to a microelectromechanical system (MEMS) resonator-based oscillator
AssigneeTexas Instruments Incorporated
InventorsBichoy Bahr, Yogesh Ramadass
Life of this patent
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Abstract
In one example, an apparatus comprises an oscillator having a control input and a clock output. The apparatus also comprises a frequency control circuit having an input and a control output, the control output coupled to the control input, and a reference clock generator having a reference clock output. The apparatus also comprises a multiplexer having a first multiplexer input, a second multiplexer input, a selection input, and a multiplexer output, the first multiplexer input coupled to the clock output, the second multiplexer input coupled to the reference clock output, and the multiplexer output coupled to the input of the frequency control circuit.
Claims21
An apparatus comprising:
- an oscillator having a control input and a clock output;
- a frequency control circuit having an input and a control output, the control output coupled to the control input;
- a reference clock generator having a reference clock output;
- and
- a multiplexer having a first multiplexer input, a second multiplexer input, a selection input, and a multiplexer output, the first multiplexer input coupled to the clock output, the second multiplexer input coupled to the reference clock output, and the multiplexer output coupled to the input of the frequency control circuit.
An integrated circuit (IC), comprising:
- a clock circuit having a first output, the clock circuit including:
- an oscillator having a control input and a clock output;
- a frequency control circuit having an input and a control output, the control output coupled to the control input;
- a reference clock generator having a reference clock output;
- and
- a multiplexer having a first multiplexer input, a second multiplexer input, a selection input, and a multiplexer output, the first multiplexer input coupled to the clock output, the second multiplexer input coupled to the reference clock output, and the multiplexer output coupled to the input of the frequency control circuit;
- and
- a second circuit having a clock input coupled to the clock output.
Dependencies are inferred from the claim text.