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A new headphone driver IC based on a switching output stage in continuous conduction mode is described. The driver uses a sliding-mode peak-valley control scheme to regulate the inductor current. The output stage is switched between the battery voltage and the output of an integrated non-regulated inverting charge pump, and a second-order loop filter is used to regulate the output voltage. The system...
This paper presents an adaptive edge decision feedback equalizer (DFE) with 4PAM signaling. Optimal DFE tap coefficients and threshold voltages for data recovery are obtained adaptively using sign-sign least-mean-square (SS-LMS) algorithms that minimize data jitter. Clock and data recovery is carried out using a dual phase/frequency-locked loop. A 10 Gbps 4PAM serial link has been designed in a 65...
A novel offset calibration technique with fast convergence rate for high-speed dynamic comparators is presented. The circuit utilizes a multi-rate charge pump circuitry to speed up the calibration process while maintaining the precision which leads to better energy efficiency. The circuit is designed in a 0.13μm CMOS process. Based on Monte-Carlo simulation results the comparator achieves 183.1μV...
This paper presents a comparative study of dual-adaptive DFE for 4PAM serial links with a reduced number of error slicers. Two set of SS-LMS DFE, one for optimal DFE tap coefficients and the other for optimal reference for error generation are employed. The data-dependent nonlinear characteristics of channels and their effect on the choice of the reference for error generation are investigated. We...
This paper presents a wideband LC PLL designed for multi-protocol serial link applications. Dual LC voltage controlled oscillator (VCO) cores are used to cover a wide frequency range while keeping a high Q factor of the LC tank, and multi-ratio dividers are used to satisfy the multi-protocol requirements. Each LC VCO adopts a 4-bit switch capacitor to increase the frequency tuning range and decrease...
In this paper, an advanced layout scheme of an integrated capacitor is presented which improves the efficiency of a poly-poly capacitor based voltage doubler charge pump. The main losses in voltage doubler charge pumps are mathematically described and the importance of low stray capacitances are discussed. By means of the improved poly-poly capacitor layout, the usable capacitance is increased while...
Although recent research has theoretically demonstrated that enzymatic glucose biofuel cell can be used to power a contact lens-based glucose sensor, such a practical system does not exist. Here, we developed a novel closed loop system consisting of a charge pump circuit and a step up DC converter circuit that is powered by a single enzymatic glucose biofuel cell at physiological conditions. This...
An ultra-low power autonomous MPPT algorithm that maximizes the efficiency of a monolithic 0.98 mm2 solar harvester is presented. Using only the pn-junctions of the standard 130 nm single n-well process, the monolithic harvester can serve as supply for wireless sensor grains. Based on the perturbation and observation method, the MPPT algorithm maximizes the output current of the integrated charge...
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