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High performance passive devices for millimeter wave (MMW) system, including inductor, ring resonator, power combiner, coupler, balun, transmission line, and antenna, are first realized using integrated fan-out (InFO) wafer level packaging technology. The inductors has quality factor over 40; the power combiner, coupler, and balun show lower transmission loss than on-chip passives; antenna has the...
The aim of this paper is to propose a new integrated permanent magnet synchronous motor (PMSM) drive to improve performance for the whole speed range. Conventionally, in the field-weakening PMSM (or interior PMSM) drive, there are three common drawbacks, which are high copper loss, poor current transient performance, and greatly sensitive to the variation of dc-link voltage. The proposed control strategy...
A new concept of stacked-spiral inductor fully-filled with VERTICAL closed-circuit nano-particle magnetic core in CMOS is reported. Prototypes, fabricated in a six Al metal layer CMOS backend process using ferrite nanoparticles, show a high inductance-density up to 920 nH/mm2 in multi-GHz, which is promising for making super compact inductors in RF system-on-a-chip (SoC).
This paper presented a battery-free energy harvesting system with an auto-startup mechanism to achieve AC power monitoring. The proposed switch capacitor sampler (SCS) technique suppresses the total harmonic distortion (THD) since the energy is derived from the AC power lines. It can improve the performance of the power factor correction (PFC) in the harvesting system to achieve high power utilization...
The proposed current-mode synthetic control (CSC) technique in the design of boost converters can improve the transient response time and maintain high conversion efficiency over a wide load range. The CSC technique has high accuracy similar to the current-mode control and doesn't need the slope compensation for simplicity. Besides, the transient response is also improved due to the current-mode hysteresis...
The Avalanche Photodiodes (APDs) are widely used in a variety of optical application requiring high sensitivity, such as long-distance optical communication and optical distance measurement, because the APDs can detect the low level light. APDs accompanied with the Transimpedance Amplifier (TIA) are utilized on the receiver side in the communication system. The trend of integrating the active optical...
A single-inductor dual-output (SIDO) step-down converter with continuous conduction mode (CCM) control is proposed for high efficiency system-on-a-chip (Soc) integration. The cross regulation in steady-state output voltage ripple, which is rarely mentioned, is effectively reduced as well as in transient response. The low-voltage energy distribution controller (LV-EDC) circuit guarantees good voltage...
This interleaving energy-conservation mode control for single-inductor dual-output converter uses the superposition technique to yield the optimal average inductor current and 91% peak efficiency. Neither a freewheel stage nor a post-regulator is needed at nominal conditions. The output voltage ripple appears notably minimized over 50% by means of current interleaving at full load. The chip occupies...
Methyl tert-butyl ether(MTBE) is widely used as gasoline additive. Surface waters in China were polluted by MTBE with different degrees. MTBE was found to be one of the most resistant towards molecular ozone attack and difficult to be degraded by microbe. In this study, experiments were carried out to investigate the removal efficiency of MTBE by catalytic ozonation in the presence of two kinds of...
In this paper, we report both circuits design and system simulations using highly-efficient monolithic SiGe class-E power amplifier (PA) with an open-loop envelope tracking (ET) technique for mobile WiMAX/Wibro applications. The 1-stage and 2-stage class-E PAs were designed and fabricated in a 0.18 mum BiCMOS SiGe technology. The 1-stage class-E PA achieved peak power added efficiency (PAE) of 62%...
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