FMCW Radar Temperature Sensor Polling Glitch Reduction
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Solution Overview
Problem
Temperature sensor systems in FMCW radar devices often disturb frequency-modulated continuous wave (FMCW) modulation waveforms, causing glitches and compromising radar performance and target detection due to the need for continuous monitoring and switching between sensors.
Innovation Solution
A temperature sensing system that uses polling to monitor multiple temperature sensors, halting sensor polling when switching to an IDLE mode and employing a digital controller to select and read temperature values, thereby reducing timing glitches and using a single processing pipeline and shared circuitry to minimize chip area and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous temperature sensor polling is performed to ensure accurate temperature monitoring, then temperature tracking accuracy is improved, but FMCW modulation waveform stability deteriorates due to timing glitches
Solution Approach 1:
The patent implements periodic temperature sensing only during IDLE periods between FMCW chirps, rather than continuous polling. The temperature sensor is enabled during IDLE mode to perform measurements, and disabled during FMCW transmission to avoid interfering with the modulation waveform. This periodic action during non-critical periods maintains temperature monitoring capability while preserving FMCW signal stability.
Solution Approach 2:
The patent performs temperature sensing actions in advance during IDLE periods before the next FMCW chirp begins. By completing temperature measurements before the critical FMCW transmission starts, the system ensures temperature data is available for thermal management decisions without introducing glitches during the actual radar signal transmission.
2Reliability
If multiple temperature sensors are used for comprehensive temperature monitoring, then temperature measurement coverage is improved, but device complexity increases due to sensor switching requirements
Solution Approach 1:
The patent divides the temperature monitoring function into separate temperature sensing units, each with its own dedicated ADC and processing pipeline. This segmentation allows multiple sensors to operate independently without requiring complex switching mechanisms, as each sensor unit is self-contained and can be managed separately by the digital controller.
Solution Approach 2:
The patent implements a universal temperature sensing architecture where multiple temperature sensors share common functional blocks including the temperature sensor system interface and digital controller. This multi-functionality approach allows the same hardware infrastructure to support multiple sensors, reducing overall complexity compared to dedicated processing for each sensor.
3Speed
If temperature sensing is performed during FMCW operation to maintain real-time monitoring, then responsiveness is improved, but FMCW chirp linearity deteriorates due to sensor disturbances
Solution Approach 1:
The patent performs temperature sensing periodically during IDLE periods between FMCW chirps rather than continuously during FMCW transmission. This timing strategy ensures that temperature measurements are taken at regular intervals without interrupting the FMCW modulation process, maintaining both chirp linearity and adequate temperature monitoring responsiveness.
Solution Approach 2:
The patent uses the IDLE period as an intermediary time window to perform temperature sensing operations. This intermediary period serves as a buffer that allows temperature measurements to be taken without directly interfering with the FMCW transmission, effectively decoupling the temperature sensing function from the radar signal generation function.
Data Source
AI summary
A radar device (100) is described that includes at least one transceiver (205) configured to support frequency modulated continuous wave (FMCW); a digital controller (262); and a temperature sensor system comprising a plurality of temperature sensors (222, 232, 242) coupled to various circuits (220, 230, 240) in the at least one transceiver (205). The digital controller (262) of the radar device (100) is configured to monitor a temperature of the various circuits (220, 230, 240) by polling temperature values of the plurality of temperature sensors (222, 232, 242).