Impedance ratio-based current conveyor
AssigneeSynaptics Incorporated
InventorEric Bohannon
Life of this patent
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Abstract
An input device associated with a sensing region is disclosed. The input device includes: a first sensor electrode associated with the sensing region and configured to propagate a resulting signal; an first auxiliary component configured to generate an output using a scaled signal; and a first impedance ratio-based current conveyor coupled to the first sensor electrode and including: a staging circuit configured to generate an input signal using the resulting signal and a ratio of a first impedance to a second impedance; and a set of current mirrors configured to generate the scaled signal from the input signal.
Claims20
An input device associated with a sensing region, comprising:
- a first sensor electrode associated with the sensing region and configured to propagate a resulting signal;
- a first auxiliary component configured to generate an output using a scaled signal;
- and
- a first impedance ratio-based current conveyor coupled to the first sensor electrode and comprising:
- a staging circuit configured to generate an input signal using the resulting signal and a ratio of a first impedance to a second impedance, wherein the ratio of the first impedance to the second impedance establishes a gain applied to the resulting signal when generating the input signal;
- and
- a set of current mirrors configured to generate the scaled signal from the input signal.
A method for operating an input device associated with a sensing region, comprising:
- propagating, through a sensor electrode associated with the sensing region, a resulting signal;
- generating, by a staging circuit of an impedance ratio-based current conveyor, an input signal using the resulting signal and a ratio of a first impedance to a second impedance wherein the ratio of the first impedance to the second impedance establishes a gain applied to the resulting signal when generating the input signal;
- generating, by a set of current mirrors of the impedance ratio-based current conveyor, a scaled signal using the input signal;
- and
- generating, by an auxiliary component, an output using the scaled signal.
A processing system for an input device associated with a sensing region, comprising:
- a sensor circuitry configured to:
- propagate, through a sensor electrode associated with the sensing region, a resulting signal;
- generate, by a staging circuit of an impedance ratio-based current conveyor, an input signal using the resulting signal and a ratio of a first impedance to a second impedance, wherein the ratio of the first impedance to the second impedance establishes a gain applied to the resulting signal when generating the input signal;
- generate, by a set of current mirrors of the impedance ratio-based current conveyor, a scaled signal using the input signal;
- and
- generate, by an auxiliary component, an output using the scaled signal;
- and
- a determination circuitry configured to:
- determine a presence of an input object in the sensing region using the output.
Dependencies are inferred from the claim text.