High-precision TDC based on equivalent segmentation and equivalent measurement method thereof

Abstract

The invention discloses a high-precision TDC based on equivalent segmentation. A second-order time digital conversion structure of equivalent segmentation based on an FPGA is adopted, and the high-precision TDC comprises a first-order delay ring reduction interpolator, a second-order interpolator based on equivalent segmentation, a triggering pulse generation module, a synchronization module, an integer period counter, a data storage module and a delay line phase-locked oscillator. According to the first-order interpolator, the conversion rate of the TDC is increased with a low measurement resolution ratio, the second-order interpolator is composed of multiple delay ring reduction interpolators connected in parallel, by the adoption of an equivalent segmentation method, the measurement resolution ratio is increased, measurement precision is improved, the triggering pulse generation module is used for generating a starting signal and an ending signal for the TDC, the synchronization module eliminates the semi-stable state effect of a register through multiple trigger structures, the integer period counter is composed of multiple counters based on the principle of the shifting register, and the delay line phase-locked oscillator uses feedback for controlling core voltage of the FPGA to stabilize the measurement result of the TDC. The measurement prevision is high, and the conversion rate is high.

Description

technical field [0001] The invention belongs to the technical field of high-precision time-frequency measurement, and in particular relates to a high-precision TDC based on equivalent subdivision and an equivalent measurement method thereof. Background technique [0002] High-precision time interval measurement equipment is widely used in basic research and engineering applications. However, the high-precision time interval measurement method based on FPGA is one of the most popular and high-precision time interval measurement methods at present. FPGA-based TDC has Realize the characteristics of short cycle, low cost, and flexibility. Single logic gates, differential logic gates and fast carry chains are used to achieve high-precision time interval measurement. However, the delay of a single logic gate inside FPGA limits the measurement resolution and measurement accuracy of TDC based on FPGA logic gates. In order to overcome these limiting factors , delay line redundant me...

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Problems solved by technology

Single logic gates, differential logic gates and fast carry chains are used to achieve high-precision time interval measurement. However, the delay of a single logic gate inside FPGA limits the measurement resolution and measurement accuracy of TDC ba

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