A 9-Bit, 1.08ps Resolution Two-Step Time-To-Digital Converter In 65 Nm Cmos For Time-Mode Adc

This paper presents the design of a 9-bit, Two-Step Time-to-Digital Converter (TDC) in 65 nm CMOS for the application in a time-mode ADC. The proposed TDC uses body biasing in the fine TDC to obtain the resolution of the entire TDC, which is simulated to be 1.08 ps. With a dynamic range of 555 ps, the maximum conversion time between START and the availability of results is 2.7 ns. The proposed TDC consumes 0.667 mW at 200 MHz, with a FoM of 0.0065 pJ/conversion. The DNL and INL are simulated to be -0.097/0.2 LSB and -0.12/0.41 LSB respectively.