Learn More
We present a small-area second-order all-digital time-to-digital converter (TDC) with two frequency shift oscillators (FSOs) comprising inverter chains and dynamic flipflops featuring low jitter. The proposed FSOs can maintain their phase states through continuous oscillation, unlike conventional gated ring oscillators (GROs) that are affected by transistor(More)
—This paper presents a two-stage second-order noise shaping time-to-digital converter (TDC) using a one-bit digitally-controlled oscillator (DCO). The clocks output from DCOs are counted and digitized as in a conventional gated ring oscillator (GRO) TDC. A time error is propagated to the second DCO, which provides second-order noise shaping. In the(More)
This paper describes a non-contact and noise-tolerant heart beat monitoring system. The proposed system comprises a microwave Doppler sensor and range imagery using Microsoft Kinect™. The possible application of the proposed system is a driver health monitoring. We introduce the sensor fusion approach to minimize the heart beat detection error. The proposed(More)
— This report describes an all-digital phase-locked loop (ADPLL) with temperature-compensated settling time reduction. The novelty of this work is autonomous oscillation control word estimation without a look-up table or memory circuits. The proposed ADPLL includes a multi-phase oscillator as a digitally controlled oscillator (DCO). Digital timing error(More)