An On-Chip Synchronous Self-Repair System Based on Low Frequency Reference Signal

Abstract

The invention discloses an on-chip synchronous self-repair system based on a low-frequency reference signal. The system adopts a dual-input PLL star coupling structure or a dual-input PLL butterfly coupling structure. Synchronization makes the delay of the whole loop an integer multiple of the reference signal, so as to ensure the synchronization of the local oscillator signals of each IC chip, and uses a transmission line based on an adjustable left-hand material as a delay line to connect to a dual-input PLL to achieve low loss and reduce The physical distance of the delay line is reduced. The system has the advantages of small area, low loss, strong self-adaptation, and strict synchronization in various environments.

Description

technical field [0001] The invention relates to the field of radar phased arrays, in particular to a synchronous self-repairing system for phases of local oscillator signals between digital transceiver chips on array element tiles in the phased array. Background technique [0002] In a large array, how to synchronize each array element is the key technology of phased array. The use of the array requires strict synchronization. For the analog array, the phase difference between the array elements is fixed, and for the digital array, the phases between the array elements are the same; large-scale digital phased arrays are usually composed of multiple array element tiles, and each array element tile contains Several to dozens of digital transceiver chips. There are two types of synchronization requirements in the system: intra-tile synchronization and inter-tile synchronization. Changes in the environment will lead to failure of synchronization during installation. There is a...

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Problems solved by technology

Changes in the environment will lead to failure of synchronization during installation. There is a phase offset between the LO signals of multiple IC chips in the array tile. This static offset is undesirable for phased arrays and needs to be minimized. Achieving synchronization within array tiles

[0003] In addition, the synchronization system needs to make up the delay to an integer multiple of the period. Since the wavelength of the low-frequency signal is too long (for example, the wavelength of the 10MHz reference signal in the air is 30 meters), and the size of the array element tile is usually much smaller than 1 meter, The use of low-frequency synchronous systems requires an equivalent delay line of up to 30 meters, which is unacceptable

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