A Noise-Shaping Time-to-Digital Converter Using Switched-Ring Oscillators—Analysis, Design, and

Abstract

A high-resolution time-to-digital converter (TDC) using switched-ring oscillator s (SROs) is presented. Leveraging oversampling and noise shaping, the proposed SRO-TDC achieves high resolution without the need for calibration. Ring oscillators are switched between two frequencies to achieve noise shaping of the quantization error in an open-loop manner. By decoupling the sampling clock and input carrier frequencies, SRO-TDC is ca- pable of operating at high oversam pling ratios (OSRs). This paper also discusses different noise s ources and quantization/device noise tradeoffs in noise-shaping TDCs and presents techniques to characterize TDC linearity, range, and noise performance. Fab- ricated in 90 nm CMOS technology, the proposed TDC operates over a wide range of input carrier frequencies (0.6–750 MHz) and sampling rates (50–750 MS/s). At 500 MS/s and 80 MHz carrier frequency, it achieves an integrated noise of 315 fs in a 1 MHz bandwidth while consuming 1.5 mW from a 1 V supply. The SRO-TDC occupies an active die area of only 0.02 mm .