READ-OUT CIRCUITS AND PROCEDURES
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- OBSIDIAN SENSORS INC
- Filing Date
- 2019-04-17
- Publication Date
- 2026-06-03
AI Technical Summary
MEMS sensors, particularly bolometer arrays, face overwhelming interference from common mode changes due to ambient conditions and self-heating, which dominate the intended thermal image signal by several orders of magnitude, leading to reduced dynamic range and accuracy in measurements.
The implementation of a sensor readout circuit with a reference sensor and an active sensor, utilizing constant current sources and a voltage driver to generate a bias voltage that tracks common mode effects, allowing for compensation of these changes without additional circuitry, thus improving accuracy and reducing the input range requirements of subsequent analog-to-digital converters.
This approach efficiently compensates for common mode effects, enhancing the accuracy of thermal image signals and reducing the complexity and cost of subsequent measurement stages by maintaining column voltages at fixed levels, unaffected by parasitic elements.