High-precision time delay system and method based on FPGA and time delay chip

Abstract

The invention belongs to the technical field of high-precision time delay, and particularly relates to a high-precision time delay system and method based on an FPGA and a time delay chip, and the system comprises an external triggering input module, an FPGA module, a low-jitter clock module, a fine time delay generation module, and an ultra-narrow pulse width signal generation module. The external triggering input module is connected with an I / O port of the FPGA module. The FPGA module is connected with a low-jitter clock module, the low-jitter clock module U3 provides a low-jitter clock signal for the FPGA module, the FPGA module is connected with the fine delay generation module, and the fine delay generation module is connected to the ultra-narrow pulse width signal generation module.Coarse time delay is achieved through counting of the FPGA module, and the time delay range is large; the fine time delay generation module can realize fine time delay through a special time delay chip, and the time delay resolution is high and can reach a time delay range of 5 ps to 5.115 ns; and the low-jitter clock module is adopted to generate low-jitter clock signals, and low-jitter and high-quality reference clock signals are provided for the FPGA. The system and the method are used for signal delay.

Description

technical field [0001] The invention belongs to the technical field of high-precision time-delay, and in particular relates to a high-precision time-delay system and method based on an FPGA and a time-delay chip. Background technique [0002] The delay circuit in the prior art may have problems such as low delay accuracy or insufficient delay range. For example, although the dual-ramp comparison method can achieve a delay accuracy of 8.6ps, it has problems such as uneven step delay and relatively large noise of the ramp itself. The dedicated delay chip can achieve a delay accuracy of less than 10 ps, ​​but the delay range is relatively small, and it is also not enough for the sampler to sample high-frequency signals of 25 GHz and above. Contents of the invention [0003] Aiming at the technical problems of the above-mentioned double-ramp wave comparison method with uneven step delay, relatively large noise of the ramp itself, and relatively small delay range, the present ...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the technical problems of the above-mentioned double-ramp wave comparison method with uneven step delay, relatively large noise of the ramp itself, and relatively small delay range, the present invention provides a device with high delay accuracy, large delay range, and strong anti-interference ability. High-precision delay system and method based on FPGA and delay chip

Images