Drive loop for MEMS oscillator
First Claim
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1. A method for controlling a MEMS device, comprising:
- generating a current according to a movement of the MEMS device;
the movement is controlled by a control signal;
converting the current to a voltage signal;
amplifying the voltage signal;
generating a peak voltage according to the amplified voltage signal; and
adjusting the control signal during a period that the peak voltage is out of a predetermined range, the predetermined range ranging from a first reference voltage to a second reference voltage.
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Abstract
Some embodiments regard a method comprising: generating a current according to a movement of the MEMS device; the movement is controlled by a control signal; generating a peak voltage according to the current; and adjusting the control signal when the peak voltage is out of a predetermined range.
29 Citations
19 Claims
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1. A method for controlling a MEMS device, comprising:
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generating a current according to a movement of the MEMS device;
the movement is controlled by a control signal;converting the current to a voltage signal; amplifying the voltage signal; generating a peak voltage according to the amplified voltage signal; and adjusting the control signal during a period that the peak voltage is out of a predetermined range, the predetermined range ranging from a first reference voltage to a second reference voltage. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A MEMS circuit comprising:
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a MEMS oscillator configured to generate a current; a current-to-voltage converter configured to convert the current to a first voltage; an amplifier configured to convert the first voltage to a second voltage; a voltage peak detector configured to generate a voltage peak of the second voltage; a calibrating circuit configured to receive the voltage peak and generate a calibrating circuit signal; a voltage generating circuit configured to generate a third voltage based on the calibrating circuit signal; and a driver configured to receive the second voltage as an input and the third voltage as an operation voltage and generate a fourth voltage for use by the MEMS oscillator. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A circuit comprising:
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a node having a first voltage; a voltage peak detector coupled to the first node and configured to generate a voltage peak of the first voltage; a comparator configured to generate a compare-result signal based on the voltage peak, a first reference voltage, and a second reference voltage; a state machine configured to generate a state machine signal based on the compare-result signal; a voltage generating circuit configured to generate a second voltage based on the state machine signal, a voltage level of the second voltage, and a third reference voltage; and a driver coupled to the first node and configured to receive the first voltage as an input and the second voltage as an operation voltage and generate a third voltage for use by an oscillating circuit;
a voltage level of the first voltage corresponding to a voltage level of the third voltage via a feedback loop. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification