High-speed pulse signal counting device for mercury ion microwave frequency marker and method thereof

Abstract

The invention discloses a high-speed pulse signal counting device for a mercury ion microwave frequency marker and a method thereof, and relates to the detection field of mercury ion microwave frequency marker signals. The counting device comprise an LVDS receiving circuit (10), a posedge detection circuit (20), a counting circuit (30), and a control circuit (40) connected in order; the LVDS receiving circuit (10) is respectively connected with the posedge detection circuit (20), the counting circuit (30), and the control circuit (40). The main circuit disclosed by the invention is realized in a FPGA, and the function realization way is flexible; a work clock of the device can be lowered by use of the LVDS receiving circuit, a FPGA timing design requirement is reduced, the design difficulty is lowered, and the pulse resolution can be improved; the counting device has the advantages of high integration level and small volume; the system is used for the detection field of the mercury ion microwave frequency marker signal, and can be easily popularized to the weak signal detection field based on single photon counting.

Description

technical field [0001] The invention relates to the field of mercury ion microwave frequency standard signal detection, in particular to a high-speed pulse signal counting device and method for mercury ion microwave frequency standard, specifically refers to the high-speed pulse signal counting in mercury ion microwave frequency standard. Background technique [0002] The mercury ion microwave frequency standard is one of the microwave frequency standards with high stability and small drift among the existing microwave frequency standards. Its clock transition frequency is as high as 40.5GHz, and its line width can be compressed to tens of millihertz, so its Q value is very high. In the mercury ion microwave frequency standard, it is necessary to 199 Hg + Ions are trapped in the ion trap, and the ions trapped in the ion trap will not collide with the wall, and the collision frequency shift is small; on the other hand, mercury ions are less sensitive to magnetic fields and ...

AI Technical Summary

Problems solved by technology

Chinese patent CN101860358A counts the signal output by the comparator directly through FPGA (Field-Programmable Gate Array, Field Programmable Gate Array). When capturing narrower pulses, this circuit needs a very high FPGA working clock, which is not conducive to the operation of FPGA. timing design

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