RPI ID:
2019-088-401

Innovation Summary:
A system is disclosed for sensing arterial pulse waveforms using a resistive bridge sensor with integrated offset calibration circuitry. The calibration system includes dual current digital-to-analog converters (IDACs), successive approximation registers (SARs), and a comparator that adjusts compensation currents based on voltage comparisons to a common mode reference. The sensing system also includes a low-pass filter with duty cycle-controlled bandwidth, instrumentation amplifier, and analog-to-digital converter. The architecture enables precise offset correction and low-power operation suitable for continuous cardiovascular monitoring.

Challenges / Opportunities:
Traditional pulse waveform sensing systems often rely on light-based methods or complex instrumentation, which can be power-intensive or uncomfortable for long-term use. This system offers a compact, low-power alternative with enhanced calibration accuracy. It is well-suited for wearable or implantable health monitoring devices and may improve diagnostic precision for cardiovascular conditions.

Key Benefits / Advantages:
✔ Low power consumption
✔ Accurate offset calibration via SAR-controlled IDACs
✔ Compatible with pressure, humidity, and temperature sensing
✔ Suitable for long-term monitoring applications
✔ Enables precise arterial pulse waveform detection

Applications:
• Cardiovascular diagnostics
• Wearable health monitors
• Implantable biosensors
• Continuous vital sign tracking

Keywords:
arterial pulse waveform, resistive bridge sensor, offset calibration, SAR controller, low-power sensing, cardiovascular monitoring

Intellectual Property:
US Issued Patent no. US12478264B2