Master-Slave Clock Signal Embedding for Radar Phase Error Reduction
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Solution Overview
Problem
Current radar systems face challenges in clock distribution and synchronization due to misalignment between clock valid and frame start timings, particularly in cascaded systems with multiple ICs, leading to phase errors that compromise angular resolution and system performance.
Innovation Solution
Embedding a frame start signal, such as a chirp start signal, within the clock signal for distribution between master and slave devices, allowing for inherent synchronization and reducing reliance on PCB construction, thereby minimizing delays and phase errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate clock and frame start signals are distributed to multiple devices, then synchronization control is flexible, but timing misalignment and phase errors occur
Solution Approach 1:
The patent combines the frame start signal and clock signal into a single integrated signal that is distributed to all devices. This merging eliminates the timing misalignment between separate signals while reducing the complexity of distributing and synchronizing multiple independent signals across multiple devices.
Solution Approach 2:
The integrated signal serves multiple functions simultaneously: it provides both the frame start timing and the clock synchronization for all devices. This multi-functionality approach resolves the contradiction by achieving reliable synchronization without requiring complex separate signal distribution paths.
2Reliability
If multiple reference oscillators are used in cascaded systems, then each device has independent clock source, but phase errors and synchronization issues arise
Solution Approach 1:
The patent extracts the reference clock source to a single master device and distributes it to all slave devices through the integrated signal. This eliminates phase errors caused by multiple independent oscillators while maintaining reliable clock distribution across the cascaded system.
3Manufacturing precision
If strict PCB routing constraints are imposed for signal synchronization, then timing alignment is achieved, but design flexibility and ease of manufacture decrease
Solution Approach 1:
By merging the frame start and clock signals into one integrated signal path, the patent reduces the number of critical routing constraints needed on the PCB. This maintains timing alignment while significantly improving PCB design flexibility and ease of manufacture.
Data Source
AI summary
A communication unit (300) is described that includes a plurality of cascaded devices that includes at least one master device and at least one slave device configured in a master-slave arrangement. The at least one master device comprises a modulator circuit (362) configured to: receive a system clock signal and a frame start signal; modulate the system clock signal with the frame start signal to produce a modulated master-slave clock signal (384); and transmit the modulated master-slave clock signal (384) to the at least one slave device. The at least one slave device comprises a demodulator circuit (364) configured to: receive and demodulate the modulated master-slave clock signal (384); and re-create therefrom the system clock signal (388, 385) and the frame start signal (390, 386).