Low-power-consumption high-precision array-type time digital conversion circuit based on multiple VCOs (voltage controlled oscillators)

Abstract

The invention discloses a low-power-consumption high-precision array-type time digital conversion circuit based on multiple VCOs (voltage controlled oscillators). The low-power-consumption high-precision array-type time digital conversion circuit comprises an ultrahigh-phase TDC (time-to-digital converter) circuit, a high-phase TDC circuit, a middle-phase TDC circuit, a low-phase TDC circuit and a DFF latch chain, the ultrahigh-phase TDC circuit, the high-phase TDC circuit and the DFF latch chain are in a pixel exclusive circuit and are arranged in a pixel, and the middle-phase TDC circuit and the low-phase TDC circuit are in a global shared circuit and arranged outside the pixel; measuring of time interval is completed through orderly cooperation of the ultrahigh-phase TDC circuit, the high-phase TDC circuit, the middle-phase TDC circuit and the low-phase TDC circuit, and finally the time interval is converted into a numerical value for representation. The low-power-consumption high-precision wide-range four-phase array-type time digital conversion circuit can be used for an array-type detector timing system and can obviously improve resolution of the system and lower power consumption of the system.

Description

technical field [0001] The invention relates to a low-power and high-precision array-type time-to-digital conversion circuit based on multiple VCOs (Voltage Controlled Oscillator, voltage-controlled ring oscillation), which is a low-power and high-precision quadcopter that can be applied to infrared sensing readout circuits. A segmented array type time-to-digital conversion circuit, which can effectively improve system resolution and reduce system power consumption without affecting the pixel area. Background technique [0002] According to the time measurement principle of TOF (Time of Flight), different pixel single-photon sending and receiving intervals in the infrared ROIC (Readout Integrated Circuit) readout circuit correspond to different spatial distances, and the relative distance between each pixel in the pixel array can show the waiting time The contour of the object is measured, and the high-precision, wide-range TDC circuit is the guarantee that the detection sys...

AI Technical Summary

Problems solved by technology

However, due to the finer error extraction and quantization process in the general multi-stage structure, there must be a response time, and another time amount cannot be detected at the same time, so the multi-stage TDC is difficult to apply to large arrays, so it is currently suitable for large arrays. Type TDC mainly focuses on the two-stage structure

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