A Two-Step Time-to-Digital Converter using Ring Oscillator Time Amplifier

초록

A two-step time-to-digital converter using a ring oscillator time amplifier is presented. The time amplifier structure does not accumulates the error in the iterative process of time. There are 8 bits in total, of which 4 bits are obtained in the coarse conversion and 4 bits are obtained in the fine conversion by amplifying the remaining time. The TDC circuit occupied an area of 0.34 mm(2) using 180 nm CMOS process. The effective number of bits is 7.42bits. The TDC circuit has shown 10.5 ps resolution for a 50 MHz. The DNL and INL are 0.7(LSB) and 0.5(LSB), respectively. The power consumption is 1.34 mW with a 1.8 V supply.

키워드