A Time-to-Digital Converter Based on PVT Detection Circuit

Abstract

A time-to-digital converter based on a PVT detection circuit. The PVT detection circuit uses a delay line with an optimized locking condition to distinguish PVT process corners, and adjusts the delay time in the TDC according to the delay time at different process corners to improve The accuracy of TDC, the design can detect the corner and automatically adjust the delay time, compared with the existing TDC, it has better resistance to PVT.

Description

technical field [0001] The invention relates to a time-to-digital converter based on a PVT detection circuit, belonging to the technical field of digital-analog hybrid integrated circuits. Background technique [0002] TDC is widely used in integrated circuits and is an important unit for synchronization and measurement in digital circuits. According to its application, it can be roughly divided into two categories: one is the TDC used to measure the time of flight (Time-of-Flight, TOF). Most of this type of TDC detects the distance to the target object by measuring the time-of-flight of particles or lasers, such as high-energy physics experiments, lidar detection, 3D imaging technology, etc. Another type of application is the TDC used to quantize the phase error in an all digital phase-locked loop (ADPLL). As a phase detection module of ADPLL, TDC compares the time difference between its reference clock and feedback clock and quantizes it into a digital signal. The uncer...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to automatically adjust the delay time of TDC through the PVT detection circuit, which can improve the quantization noise and delay drift caused by PVT changes, and enhance the anti-PVT performance of TDC

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