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Terahertz Band (0.1–10 THz) wireless communication, which escalates the frequency and provides unprecedented data rates, is envisioned as the key picocell wireless technology in the next five to ten years. In this band, the medium access control (MAC) is more about "scheduling transmissions," instead of "fighting for access," thanks to the huge bandwidth. On the one hand, an electronically...
A fully integrated, 5.6 GHz low-phase noise Colpitts quadrature voltage-controlled oscillator (QVCO) and broadband CMOS double-balance mixer are presented. This QVCO is a complementary cross-coupled voltage-controlled Colpitts oscillator with a 3-bit switched capacitor array parallel to the inductor to form LC resonant tank. Without buffer circuits, measured results achieve a tunable frequency range...
Aimed at the problems of larger torque ripple and non-constant inverter switch frequency in the direct torque control for asynchronous motor, this article puts forward a new idea. In same words, the idea is that the traditional PI controller is replaced by speed controller of sliding mode variable structure (SMVS). What's more, according to the mathematical models of induction motor in synchronous...
This paper proposes that the typical inductance filter in the grid-connected converter should be substituted by T-filter for the increase of harmonic component in the output current to electrical network due to lower PWM switch frequencies in the grid-connected matrix converter of variable-speed constant-frequency wind power generation system. And it has also analyzed the stability of the grid-connected...
The electromagnetic torque ripple is one of the most important drawbacks of the Direct Torque Control for Induction Motors using Matrix Converters at low speed. This paper investigate the use of multiple voltage vectors of Matrix Converters to reduce the electromagnetic torque ripple which appears when Direct Torque Control technique is used in Induction Motors. The standard look up table for Direct...
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