Mismatch compensation for biosensor electrodes
The disclosed computer-implemented method may include measuring one or more electrical properties from a plurality of electrodes for biosignal measurement, determining, based on the measured one or more electrical properties, an impedance mismatch between at least a first electrode and a second electrode of the plurality of electrodes, and reducing the impedance mismatch by modulating an impedance of the first electrode. Various other methods, systems, and computer-readable media are also disclosed.
1 . A method comprising:
measuring one or more electrical properties from a plurality of electrodes for biosignal measurement;
selecting a reference electrode from the plurality of electrodes based on the measured one or more electrical properties, wherein a second electrode corresponds to the reference electrode;
determining, based on the measured one or more electrical properties, an impedance mismatch between at least a first electrode and the second electrode of the plurality of electrodes; and
reducing the impedance mismatch by modulating an impedance of the first electrode.
2 . The method of claim 1 , wherein:
measuring the one or more electrical properties includes measuring a first impedance of the first electrode and a second impedance of the second electrode;
determining the impedance mismatch includes comparing the first impedance to the second impedance; and
reducing the impedance mismatch includes modulating the impedance of the first electrode based on the comparison.
3 . The method of claim 1 , wherein:
measuring the one or more electrical properties includes measuring a signal using the plurality of electrodes;
determining the impedance mismatch includes predicting the impedance mismatch using the measured signal; and
reducing the impedance mismatch includes modulating the impedance of the first electrode based on the predicted impedance mismatch.
4 . The method of claim 1 , wherein reducing the impedance mismatch further comprises:
determining an updated impedance mismatch in response to modulating the impedance of the first electrode;
determining whether the updated impedance mismatch satisfies an error margin; and
modulating the impedance of the first electrode in response to determining that the updated impedance mismatch does not satisfy the error margin.
5 . The method of claim 1 , further comprising selecting a weak electrode from the plurality of electrodes and disregarding measurements from the weak electrode.
6 . The method of claim 1 , wherein reducing the impedance mismatch further comprises modulating the impedance of the first electrode using an impedance modulating circuit.
7 . The method of claim 6 , wherein the impedance modulating circuit comprises one or more variable impedance blocks.
8 . The method of claim 6 , wherein the impedance modulating circuit comprises one or more switched capacitors.
9 . The method of claim 6 , further comprising:
measuring a signal using the plurality of electrodes; and
downconverting the measured signal using the impedance modulating circuit.
10 . A biosensing device comprising:
a plurality of electrodes for biosignal measurement;
an electrical property measurement circuit;
an impedance modulating circuit; and
at least one physical processor configured to:
measure, using the electrical property measurement circuit, one or more electrical properties from the plurality of electrodes;
select a reference electrode from the plurality of electrodes based on the measured one or more electrical properties, wherein a second electrode corresponds to the reference electrode;
determine, based on the measured one or more electrical properties, an impedance mismatch between at least a first electrode and the second electrode of the plurality of electrodes; and
reduce the impedance mismatch by modulating an impedance of the first electrode using the impedance modulating circuit.
11 . The biosensing device of claim 10 , wherein:
measuring the one or more electrical properties includes measuring a first impedance of the first electrode and a second impedance of the second electrode;
determining the impedance mismatch includes comparing the first impedance to the second impedance; and
reducing the impedance mismatch includes modulating the impedance of the first electrode based on the comparison.
12 . The biosensing device of claim 10 , wherein:
measuring the one or more electrical properties includes measuring a signal using the plurality of electrodes;
determining the impedance mismatch includes predicting the impedance mismatch using the measured signal; and
reducing the impedance mismatch includes modulating the impedance of the first electrode based on the predicted impedance mismatch.
13 . The biosensing device of claim 10 , wherein reducing the impedance mismatch further comprises:
determining an updated impedance mismatch in response to modulating the impedance of the first electrode;
determining whether the updated impedance mismatch satisfies an error margin; and
modulating the impedance of the first electrode in response to determining that the updated impedance mismatch does not satisfy the error margin.
14 . The biosensing device of claim 10 , further comprising selecting a weak electrode from the plurality of electrodes and disregarding measurements from the weak electrode.
15 . The biosensing device of claim 10 , wherein the impedance modulating circuit comprises one or more variable impedance blocks.
16 . The biosensing device of claim 10 , wherein the impedance modulating circuit comprises one or more switched capacitors.
17 . The biosensing device of claim 10 , further comprising:
measuring a signal using the plurality of electrodes; and
downconverting the measured signal using the impedance modulating circuit.
18 . A system comprising:
at least one physical processor;
physical memory comprising computer-executable instructions; and
a biosensing device comprising:
a plurality of electrodes for biosignal measurement;
an electrical property measurement circuit; and
an impedance modulating circuit;
wherein the at least one physical processor is configured to:
measure, using the electrical property measurement circuit, one or more electrical properties from the plurality of electrodes;
select a reference electrode from the plurality of electrodes based on the measured one or more electrical properties, wherein a second electrode corresponds to the reference electrode;
determine, based on the measured one or more electrical properties, an impedance mismatch between at least a first electrode and the second electrode of the plurality of electrodes; and
reduce the impedance mismatch by modulating an impedance of the first electrode using the impedance modulating circuit.
19 . The system of claim 18 , wherein:
measuring the one or more electrical properties includes measuring a first impedance of the first electrode and a second impedance of the second electrode;
determining the impedance mismatch includes comparing the first impedance to the second impedance; and
reducing the impedance mismatch includes modulating the impedance of the first electrode based on the comparison.
20 . The system of claim 18 , wherein:
measuring the one or more electrical properties includes measuring a signal using the plurality of electrodes;
determining the impedance mismatch includes predicting the impedance mismatch using the measured signal; and
reducing the impedance mismatch includes modulating the impedance of the first electrode based on the predicted impedance mismatch.