In This Issue    • GMR Sensors in Medical Applications    • Active Filters for Line Noise    • Respiration Monitor   GMR Sensors in Medical Applications AA00x-Series analog GMR magnetic sensors are extremely popular for medical applications because of their ease of interface, wide supply range, temperature stability, and low noise. Popular applications include medical instruments, biosensors and surgical robotics. Features of these sensors include:    • Field ranges from <<0.1 mT to >45 mT    • Typical output impedance of 2.5 kΩ    • 0 V to 24 V supply range    • 0.05%/°C output temperature coefficient (-40 to 125°C)    • DFN6, MSOP8, and SOIC8 packages These are some examples of medical applications of these versatile parts:   •   A GMR-Based Smart Respiration Belt for Noninvasive Real-Time Monitoring     •   Magnetic ferrofluids nanotag for GMR biosensor   •   Better learning in embedded eyeblink conditioning in young human adults   •   Empowering Wearables with Ballistocardiography-based Key Generation through Magnetic Field Vibration Sensing   •   Exploring Biomagnetism for Inclusive Vital Sign Monitoring: Modeling and Implementation   •   Analysis of a GMR-Based Plethysmograph Transducer and its Utility for Real-time Blood Pressure Measurement A wide range of part types is in stock and available for immediate delivery. 0.8 x 0.4 inch (21 x 10 mm) breakout boards with easy connections are available. Download the datasheet »   Sensor Reference Circuit Corner Active Filters to Reduce 50/60 Hz Noise Line voltage noise is the bane of many sensor applications, including magnetic sensing. This low part-count reference circuit uses an instrumentation amplifier and a classic filter circuit to reduce 50 Hz or 60 Hz line-voltage noise. The filter is a second-order Sallen-Key low-pass Chebyshev filter with a 20 Hz cutoff frequency. A similar circuit was also used in a recent independent paper summarized below.       Here's a demonstration of the filter in an EKG amplifier.     Respiration Monitor A recent independent paper uses an NVE AA002-02E analog magnetic sensor in a smart respiration monitor. The system includes a Sallen-Key lowpass filter, similar to the reference design above, to attenuate power-line interference.   According to the authors, potential applications include remote health care, sleep apnea detection, and automotive safety.     Upcoming Tradeshows NVE distributor Rhopoint Components will exhibit at Space-Comm Europe, March 4-5 in London. NVE's spintronic isolators and sensors are inherently radiation tolerant. The company offers a space-grade isolator for satellites and other space applications.

Quick Links Buy Direct from NVE Sensor Selector Guide Isolator Selector Guide Contact Us	New Videos Off-Axis Angle Sensing with Legos NVE's Most Popular Sensors for Robotics Measuring Yo-Yo Speed at a Distance Live Demonstrations at MD&M Demonstrating TMR Magnetometer Sensitivity Using a Newton's Cradle EKG Amplifier