一种增益可编程的时间数字转换器

A Time-to-Digital Converter with Programmable Gain

提出了一种增益可编程时间放大器结构。采用并行输入、串行输出结构,将TDC(Time-to-Digital Converter,时间数字控制器)每级START与STOP信号异或操作并送至可编程增益时间放大器(Programmable Gain Time Amplifier,PGTA),通过数字控制部分控制PGTA增益N,TDC跳变点靠前时,将跳变点之后的N级异或门输出做累加;TDC跳变点靠后时,将跳变点之前的N级异或门输出做累加,实现时间放大功能且增益可编程、高线性度的PGTA。PGTA增益误差通过补偿器来补偿。TSMC 130nm流片验证结果显示:该TDC具有高分辨率、高线性度且增益可编程。

A gain programmable time amplifier structure is proposed.Parallel input,serial output structure,at each stage,the START and STOP signal are sent to the Programmable Gain Time Amplifier(PGTA)for XOR operation,through the digital control part to control the gain N of PGTA,When the TDC jump point is forward,the N-level XOR gates output after the jump point is accumulated,and when the TDC jump point is backward,the N-level XOR gate output before the jump point is accumulated,which could achieve time amplification as well as gain programmable,high linearity PGTA.The gain error of the PGTA can be compensated by a novel compensator.A new type of TDC based on TSMC-130nm CMOS process,and carries out the filming and testing.Test results indicate that the TDC could achieve high resolution and high linearity as well as the programmable gain.