Satellite state of health: how space-grade ICs are improving telemetry circuit design

Because satellites on space missions are inaccessible once launched, acquiring accurate telemetry data to monitor the state of health of the satellite sub-systems can help set a baseline to indicate a working system, while fluctuations can indicate failures. Two examples of sensitive components would require accurate monitoring of voltage, temperature and current are the radio-frequency (RF) power amplifiers and thermoelectric coolers. In both applications, performance fluctuates with temperature and radiation effects, and requires adjustments to the applied voltage and current in order to ensure efficient and safe operation. A telemetry circuit monitors critical system power rails and components, gathers performance data (which has value both now and for future satellite designs) and adjusts system settings accordingly.