Front-end circuit performing analog-to-digital conversion and touch processing circuit including the same
AssigneeSamsung Electronics Co., Ltd.
InventorsSanho Byun, Minsung Kim, Jungmoon Kim
Life of this patent
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Abstract
A touch processing circuit includes: a front-end circuit including an amplifier, a first capacitor, a second capacitor, a third capacitor, and a plurality of switches each having two ends that are selectively connected each other, the front-end circuit being configured to process an input signal varying according to a touch; and a controller controlling the plurality of switches so that the front-end circuit is configured as a first circuit that accumulates deviation of the input signal between a first phase and a second phase during an integration period and a second circuit that converts the accumulated deviation into a digital signal during a conversion period.
Claims20
A method for controlling a front-end-circuit configured to process an input signal that varies according to a touch, the method comprising:
- configuring the front-end-circuit as a first circuit to accumulate a deviation of the input signal between a first phase and a second phase as an accumulated deviation during an integration period by switching ones of a plurality of switches included in the front-end circuit such that an output of an amplifier included in the front-end-circuit is fed-back to an input of the amplifier;
- determining whether the integration period has completed, based on the number of periods each including the first phase and the second phase;
- and
- configuring the front-end-circuit as a second circuit to convert the accumulated deviation into a digital signal during a conversion period by switching ones of the plurality of switches such that the output of the amplifier is provided to a comparator.
A controller for a front-end-circuit configured to process an input signal that varies according to a touch, the controller configured to:
- configure the front-end-circuit as a first circuit to accumulate a deviation of the input signal between a first phase and a second phase as an accumulated deviation during an integration period by switching ones of a plurality of switches included in the front-end circuit such that an output of an amplifier included in the front-end-circuit is fed-back to an input of the amplifier;
- determine whether the integration period is completed, based on the number of periods each including the first phase and the second phase;
- and
- configure the front-end-circuit as a second circuit to convert the accumulated deviation into a digital signal during a conversion period by switching ones of the plurality of switches such that the output of the amplifier is provided to a comparator.
A method for processing an input signal that varies according to a touch, the method comprising:
- accumulating a deviation of the input signal between a first phase and a second phase as an accumulated deviation during an integration period by feeding back an output of an amplifier to an input of the amplifier;
- sampling the accumulated deviation during a sampling period;
- and
- converting the sampled deviation into a digital signal during a conversion period by providing the output of the amplifier to a comparator,
- wherein the sampling period is between the integration period and the conversion period.
Dependencies are inferred from the claim text.