Floating biopotential samplings
The disclosed biopotential measurement device may include a front end comprising a biopotential measurement sensor and a back end comprising a processor programmed to process biopotential signals detected by the biopotential measurement sensor. The biopotential measurement device may also include an isolation circuit that, during at least a sampling phase of the biopotential measurement sensor, electrically isolates the front end from the back end. Various other methods, systems, and computer-readable media are also disclosed.
1. A biopotential measurement device comprising:
a front end comprising a biopotential measurement sensor;
a back end comprising a processor programmed to process biopotential signals detected by the biopotential measurement sensor; and
an isolation circuit that electrically isolates the front end from the back end during a sampling phase of the biopotential measurement sensor and recouples the front end to the back end after the sampling phase ends;
wherein the front end discharges during the sampling phase and the back end recharges the front end during the recoupling.
2. The biopotential measurement device of claim 1 , wherein the isolation circuit comprises a data isolation circuit that electrically isolates the front end from the processor during the sampling phase.
3. The biopotential measurement device of claim 2 , wherein the data isolation circuit comprises at least one of a switch, an inductive isolation circuit, a galvanic isolation circuit, or a radio frequency (RF) module.
4. The biopotential measurement device of claim 1 , wherein:
the back end comprises a back-end power source that provides power to the processor; and
the isolation circuit comprises a power isolation circuit that electrically isolates the front end from the back-end power source during the sampling phase.
5. The biopotential measurement device of claim 4 , wherein the front end comprises a front-end power source that provides power to the biopotential measurement sensor during the sampling phase.
6. The biopotential measurement device of claim 5 , wherein the front-end power source comprises at least one of a battery, an inductor, a capacitor, or a super capacitor.
7. The biopotential measurement device of claim 5 , wherein the back-end power source provides power to the front-end power source when the back-end power source is coupled to the front-end power source and the isolation circuit electrically isolates the front-end power source from the back-end power source during the sampling phase.
8. The biopotential measurement device of claim 4 , wherein the power isolation circuit comprises at least one of a switch or an inductive isolation circuit.
9. The biopotential measurement device of claim 1 , wherein the front end further comprises a signal storage device that stores biopotential data of detected biopotential signals.
10. The biopotential measurement device of claim 9 , wherein the signal storage device comprises at least one of an analog-to-digital converter (ADC), a memory device for digitally storing detected biopotential signals as biopotential data, a capacitor, a sample and hold, or an analog device for storing the biopotential data as an analog signal.
11. The biopotential measurement device of claim 1 , wherein the biopotential measurement sensor is coupled to an analog ground and the processor is coupled to a digital ground electrically isolated from the analog ground.
12. A system comprising:
at least one physical processor;
physical memory comprising computer-executable instructions; and
a biopotential measurement device comprising:
a front end comprising a biopotential measurement sensor;
a back end comprising a back-end processor programmed to process biopotential signals detected by the biopotential measurement sensor; and
an isolation circuit that electrically isolates the front end from the back end during a sampling phase of the biopotential measurement sensor and recouples the front end to the back end after the sampling phase ends;
wherein the front end discharges during the sampling phase and the back end recharges the front end during the recoupling.
13. The system of claim 12 , wherein the isolation circuit comprises a data isolation circuit that electrically isolates the front end from the back-end processor during the sampling phase.
14. The system of claim 12 , wherein:
the back end comprises a back-end power source that provides power to the back-end processor; and
the isolation circuit comprises a power isolation circuit that electrically isolates the front end from the back-end power source during the sampling phase.
15. The system of claim 14 , wherein:
the front end comprises a front-end power source that provides power to the biopotential measurement sensor during the sampling phase; and
the back-end power source provides power to the front-end power source when the back-end power source is coupled to the front-end power source and the isolation circuit electrically isolates the front-end power source from the back-end power source during the sampling phase.
16. The system of claim 12 , wherein the front end further comprises a signal storage device that stores biopotential data of detected biopotential signals.
17. The system of claim 12 , wherein the biopotential measurement sensor is coupled to an analog ground and the back-end processor is coupled to a digital ground electrically isolated from the analog ground.
18. A method comprising:
decoupling, using an isolation circuit during a sampling phase of a biopotential measurement sensor, a front end of a biopotential measurement device having the biopotential measurement sensor from a back end of the biopotential measurement device;
sampling a biopotential signal using the biopotential measurement sensor, wherein the front end discharges during the sampling phase;
recoupling, using the isolation circuit after the sampling phase ends, the front end to the back end, wherein the back end recharges the front end during the recoupling; and
processing, using a processor of the back end, the sampled biopotential signal.
19. The method of claim 18 , further comprising charging a front-end power source of the front end using a back-end power source of the back end, wherein decoupling the front end from the back end further comprises electrically isolating the front-end power source from the back-end power source, and sampling the biopotential signal further comprises powering the biopotential measurement sensor with the front-end power source.
20. The method of claim 18 , further comprising:
storing, as biopotential data, the sampled biopotential signal in a signal storage device of the front end after sampling the biopotential signal; and
sending the stored biopotential data to the processor after recoupling the front end to the back end.