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1. (WO2018102068) TIME-TO-DIGITAL CONVERSION WITH LATCH-BASED RING

Pub. No.:    WO/2018/102068    International Application No.:    PCT/US2017/059734
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Fri Nov 03 00:59:59 CET 2017
IPC: G04F 10/00
Applicants: QUALCOMM INCORPORATED
Inventors: ZHUANG, Jingcheng
Title: TIME-TO-DIGITAL CONVERSION WITH LATCH-BASED RING
Abstract:
An integrated circuit (IC) is disclosed for time-to-digital conversion with a latch-based ring. In example aspects, the IC includes a ring, a counter, an encoder, and time-to-digital converter (TDC) control circuitry. The ring includes multiple ring stages and propagates a ring signal between successive ring stages. Each respective ring stage includes latch circuitry to secure a state of the ring signal at the respective ring stage. The ring provides a ring output signal using the latch circuitry of each of the ring stages. The ring is coupled to the counter. The counter increments a counter value responsive to the ring signal and provides a counter output signal based on the counter value. The encoder is coupled to the ring and the counter. The encoder generates a TDC output signal based on the ring and counter output signals. The TDC control circuitry operates the ring responsive to a TDC input signal.