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A 13.56 MHz 64.8 mW fully-integrated CMOS active rectifier for biomedical wireless power transfer system is presented in this summary. It employs an adaptive on/off delay compensation technique to accurately compensate for the circuit delays despite PVT variations and mismatches. With an AC input that ranges from 1.8 V to 3.6 V, the measured voltage conversion ratio is higher than 90% and the measured...
An adaptive on/off delay-compensation technique is proposed to improve the performance of CMOS active rectifiers for wireless power transfer (WPT) systems. The effects of the on/off delays on the performance of the active rectifiers with either a parallel-resonant or a series-resonant circuit at the secondary coil are studied, which include power conversion efficiency (PCE), voltage conversion ratio...
Wireless charging is developing into a standard feature of portable electronic devices to cut the last wire. Resonant wireless power transfer (R-WPT) using magnetic resonance emerges as a promising approach, as it provides spatial freedom and can charge multiple devices simultaneously. ISM-band frequencies such as 6.78MHz or 13.56MHz are commonly used as the resonant frequency of the LC tank [1–4]...
This paper presents the first IEEE 802.15.7 PHY-I standard compliant visible light communication (VLC) transmitter and LED driver SoC for location-based applications using standard white LED lights as beacons or broadcasters. Implemented in a 0.35μm CMOS process with 20-V high-voltage device, the mixed-signal SoC integrates a baseband DSP unit, a VLC modulator, and a switching boost converter with...
This paper presents a high-frequency half-bridge driver for enhancement-mode GaN-on-Si HEMTs with digital dead-time correction (DDTC) to optimize the dead-time. Due to the lateral HEMT structure, dead-time optimization is essential for synchronous driving. It helps reducing the reverse conduction loss to enhance the efficiency and reliability. The DDTC scheme achieves instant sensing with all-digital...
Continuous-time common-mode feedback (CMFB) detector circuits for a fully differential amplifier with improved common-mode voltage detection accuracy are proposed, designed and analyzed. Firstly, we analyzed the proposed N-type CMFB detector, showing that it has two turning points when the differential voltage increases and it achieves very small deviation from the detected common-mode voltage. By...
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