With its compact design and enhanced sensitivity in visible and near-infrared wavelengths, this photodiode is ideal for integration into low-profile devices such as smartwatches.
Vishay Intertechnology, Inc. has introduced a new silicon PIN photodiode, the VEMD8082, designed for biomedical applications, including heart rate and blood oxygen monitoring. This photodiode offers enhanced sensitivity in the visible and near-infrared wavelength range, making it suitable for detecting changes in blood volume and flow in applications such as photoplethysmography (PPG). It is designed with a compact form factor, measuring 4.8 mm by 2.5 mm by 0.5 mm, which enables its integration into low-profile devices like smartwatches.
It provides several advancements over previous-generation photodiodes. It features increased reverse light current and reduced diode capacitance, contributing to its higher sensitivity. The device offers faster rise and fall times, which support higher sampling rates in biomedical monitoring applications. These specifications makes it a suitable component for precise measurements in medical diagnostics, particularly in monitoring cardiovascular health.
Key specifications include:
- Radiant sensitive area of 6.0 mm²
- Increase in reverse light current of 18% to 20%Â
- Diode capacitance reduced from 50 pF to 46 pF
- Improved rise time from 40 ns from 110 ns
The improved rise time enhancing the photodiode’s performance in detecting and responding to changes in light levels.It is suited for various applications, including wearables, health monitoring, and high-speed photodetection. Its compact form factor and enhanced sensitivity in the visible and near-infrared wavelengths make it an ideal component for integration into wearable devices such as smartwatches. In health monitoring, it is particularly effective in detecting changes in blood volume and flow, crucial for heart rate and blood oxygen monitoring. Its faster rise and fall times support its use in high-speed photodetector applications, where rapid response to light changes is essential.
