Application Design Center - Medical Portable Devices
Circuit Protection of Sensor Input
Solutions
Design Notes:
- Protection Application:
- The sensor input provides an interface between the patient and the measurement circuits. The electrical threat will be ESD.
- Solution Description:
- As shown at the left, a single multilayer varistor is used to protect the sensor input.
- Companion Solutions:
- Higher-voltage ratings are available. For ultra-low leakage current requirements, the PulseGuard technology can be used.
- Regulatory Issues:
- The IEC 61000-4-2 will be the most appropriate standard that applies for this circuit. It supplies a test method for verifying that the end product is not susceptible to ESD events.
- Unique Features:
- Does not apply.
- Application Warnings:
- Does not apply.
