This paper describes the implementation of a multi-hit, multi-channel, multi-mode time-to-digital converter ASIC implemented in 0.$35\mathrm{\mu }\mathrm{m}$ commercial CMOS technology. The ASIC is designed to meet the India-based Neutrino Observatory (INO) experimental requirements. The ASIC has eight channels, each channel capable of handling four hits: a pair of rising and falling edges. The core TDC channels are designed using Vernier ring oscillator method which provides high resolution and large dynamic range simultaneously. Each channel has an in-built separate calibration capable of determining the period of oscillators with an accuracy of few picoseconds. The TDC ASIC has both serial and parallel interfaces. The TDC has a selectable dynamic range of 4 $\mathrm{\mu }$s, 16 $\mathrm{\mu }$s, 32 $\mathrm{\mu }$s & 64 $\mathrm{\mu }$s. The conversion time for each hit measurement is maximum $\sim$500 ns. The TDC ASIC is tested and has the resolution of $\sim$120 ps (LSB) and precision ($\sigma$) of less than 70 ps across the channels. The measured values of differential non-linearity (DNL) is [−0.459, 0.510] LSB and the integral non-linearity over 4 $\mathrm{\mu }$s dynamic range is [−0.0156, 0.0154] % of the full scale.

本文描述了以0实现的多点击，多通道，多模式时间数字转换器ASIC的实现。$35\mathrm{\mu }\mathrm{米}$商业CMOS技术。ASIC旨在满足印度的Neutrino天文台（INO）实验要求。ASIC具有八个通道，每个通道能够处理四个命中点：一对上升沿和下降沿。核心TDC通道采用Vernier环形振荡器方法设计，可以同时提供高分辨率和大动态范围。每个通道都有一个内置的独立校准，能够以几皮秒的精度确定振荡器的周期。TDC ASIC具有串行和并行接口。TDC的动态范围为4$\mathrm{\mu }$s，16 $\mathrm{\mu }$s，32 $\mathrm{\mu }$s＆64 $\mathrm{\mu }$s。每次点击测量的转换时间最长$〜$500 ns。TDC ASIC经过测试，分辨率为$〜$120 ps（LSB）和精度（$\sigma$）小于70 ps。微分非线性（DNL）的测量值为[-0.459，0.510] LSB，积分非线性在4$\mathrm{\mu }$s动态范围为满量程的[-0.0156，0.0154]％。