Radar SoC Self-Testing via FMCW Signal Loopback
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Solution Overview
Problem
Testing of radar integrated circuits (SoCs) is costly and time-consuming due to the need for expensive equipment and customized PCB designs, and existing methods fail to account for crucial performance characteristics like inter-channel imbalances and intra-chip leakage.
Innovation Solution
A radar SoC test system that allows for testing at production without additional peripheral equipment, using a local oscillator, transmitters, receivers, and a controller to generate and process frequency modulated continuous waveforms, enabling the assessment of performance characteristics such as intra-channel imbalance and baseband corruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional testing methods with expensive equipment and customized PCB designs are used, then measurement precision and reliability are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The radar SoC tests itself by utilizing its own internal components (local oscillator, transmitters, receivers, controller) to generate test signals and measure performance characteristics. This self-testing approach eliminates the need for external expensive test equipment and customized PCB designs, thereby reducing device complexity while maintaining measurement precision through the use of the device's own functional components.
Solution Approach 2:
The internal components of the radar SoC serve dual purposes: they perform both normal operational functions and testing functions. The local oscillator generates signals for both radar operation and self-testing, the transmitters and receivers are used for both signal transmission/reception and performance measurement. This multi-functionality reduces the need for separate dedicated test equipment, simplifying the overall test system while maintaining accurate measurement capabilities.
2Measurement precision
If traditional testing methods are used, then performance characteristics can be assessed, but production time increases and testing rate decreases
Solution Approach 1:
By enabling the radar SoC to perform self-testing during the manufacturing process, the system eliminates the need for time-consuming external testing procedures. The device uses its own internal resources to quickly assess performance characteristics, significantly reducing production time and increasing the testing rate while maintaining comprehensive performance evaluation capabilities.
Solution Approach 2:
The self-testing capability allows performance assessment to be integrated into the manufacturing process itself, rather than requiring separate post-manufacturing testing steps. This preliminary action approach enables performance verification to occur concurrently with or immediately following device fabrication, thereby reducing overall production time and increasing throughput without compromising measurement accuracy.
3Device complexity
If self-testing with internal components is used, then manufacturing cost and device complexity are reduced, but measurement precision may be compromised
Solution Approach 1:
The radar SoC utilizes its own internal components for self-testing, which are already optimized for high-precision signal generation and measurement during normal operation. The local oscillator, transmitters, receivers, and controller work together to generate frequency modulated continuous waveforms and measure performance characteristics with the same precision required for actual radar operation, eliminating measurement errors that could arise from interfacing with external test equipment.
Solution Approach 2:
The self-testing method involves generating frequency modulated continuous waveforms with specific parameters (frequency modulation, continuous wave format) that are optimized for accurate measurement of performance characteristics such as inter-channel imbalance and baseband corruption. By controlling and varying these parameters through the internal controller, the system achieves precise measurements without requiring external test equipment, thereby maintaining measurement accuracy while simplifying the test system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient and cost-effective testing of radar SoCs at production, verifying correct functionality and performance characteristics without the need for expensive test equipment, thereby reducing production time and increasing testing rate.
Implementation Method 1
cause the LO to generate a frequency modulated continuous waveform (FMCW)
Data Source
AI summary
Methods, apparatus, systems and articles of manufacture are disclosed to test RADAR integrated circuits. A radar circuit comprising a local oscillator (LO), a transmitter coupled to the LO and configured to be coupled to a transmission network, a receiver configured to be coupled to the transmission network, and a controller coupled to the LO, the transmitter, and the receiver, the controller to cause the LO to generate a frequency modulated continuous waveform (FMCW), cause the transmitter to modulate the FMCW as a modulated FMCW, cause the transmitter to transmit the modulated FMCW via the transmission network and the receiver to obtain a received FMCW from the transmission network, and in response to obtaining the received FMCW from the receiver, generate a performance characteristic of the radar circuit based on the received FMCW.