Setting a discharge rate and a charge rate of a relaxation oscillator circuit
First Claim
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1. A method, comprising:
- providing a sensor element of a sensing device, the sensor element coupled to a relaxation oscillator including a first programmable current source and a second programmable current source;
receiving a ratio of a discharge rate to a charge rate at a ratio decoder, the ratio decoder coupled to the first programmable current source and the second programmable current source; and
setting the first programmable current source and the second programmable current source based on the received ratio.
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Abstract
An apparatus and method for setting a ratio of a discharge rate to a charge rate for measuring a capacitance on a sensor element of a sensing device. The apparatus may include a sensor element of a sensing device, a relaxation oscillator having a first and a second programmable current source, and a ratio decoder to receive a ratio of a discharge rate to a charge rate, and to set the first and second programmable current sources based on the received ratio.
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Citations
18 Claims
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1. A method, comprising:
- providing a sensor element of a sensing device, the sensor element coupled to a relaxation oscillator including a first programmable current source and a second programmable current source;
receiving a ratio of a discharge rate to a charge rate at a ratio decoder, the ratio decoder coupled to the first programmable current source and the second programmable current source; and
setting the first programmable current source and the second programmable current source based on the received ratio. - View Dependent Claims (2, 3, 4, 5)
- providing a sensor element of a sensing device, the sensor element coupled to a relaxation oscillator including a first programmable current source and a second programmable current source;
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6. An apparatus, comprising:
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a sensor element of a sensing device; a relaxation oscillator, coupled to the sensor element, having a first programmable current source and a second programmable current source; and a ratio decoder coupled to the first and second programmable current sources, wherein the ratio decoder is configured to receive a ratio of a discharge rate to a charge rate, and to set the first and second programmable current sources based on the received ratio. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification