Trigger Encoding in Cascading Radar MMIC Clock Signals
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Solution Overview
Problem
Existing radar sensor systems face challenges in synchronizing multiple radar monolithic microwave integrated circuits (MMICs) due to mismatches in trigger distribution delay and clock signal distribution, leading to synchronization errors.
Innovation Solution
A cascaded radar MMIC system is implemented, where a trigger signal is encoded into a distributed clock signal by skipping or modifying clock pulses, allowing the second radar MMIC to detect the trigger event and initiate radar operations synchronously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated trigger distribution network is used to synchronize multiple radar MMICs, then synchronization accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges the trigger signal distribution function with the existing clock signal distribution infrastructure. The trigger signal is encoded into the clock signal lines, eliminating the need for separate trigger distribution networks. This is achieved by modulating the clock signal with trigger information, allowing both clock and trigger signals to be transmitted through the same physical pathways, thereby reducing system complexity while maintaining synchronization accuracy.
Solution Approach 2:
The clock signal lines are given multiple functions: they serve both as timing references for the radar MMICs and as carry the trigger signal for synchronization. By making the clock distribution network universal, the patent eliminates redundant components and reduces overall system complexity while ensuring reliable trigger distribution to all MMICs in the array.
2Device complexity
If trigger signal is encoded into distributed clock signal by skipping clock pulses, then device complexity is reduced, but measurement precision of trigger detection may worsen
Solution Approach 1:
The receiving MMICs use feedback mechanisms to detect skipped clock pulses and accurately reconstruct the trigger signal. The system monitors the clock signal pattern and identifies deviations (skipped pulses) that encode trigger information, allowing precise trigger detection despite the modified clock signal structure. This feedback-based detection ensures measurement precision is maintained while reducing system complexity.
Data Source
AI summary
A radar monolithic microwave integrated circuit (MMIC) includes a trigger encoder configured to receive a clock signal comprising a plurality of clock pulses having a fixed amplitude and a trigger signal configured to indicate trigger events. The trigger encoder is configured to encode the trigger signal into the clock signal to generate a distributed clock signal by skipping at least one clock pulse of the plurality of clock pulses to indicate a trigger event. The radar MMIC is configured to output the distributed clock signal having the at least one clock pulse skipped to indicate the trigger event. The radar MMIC is configured to receive the distributed clock signal as a received distributed clock signal. The radar MMIC further includes a radar operation controller configured to detect the trigger event based on the received distributed clock signal and initiate a radar operation based on detecting the trigger event.