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This paper presents a novel startup circuit that provides a startup operation for bias circuits and reference circuits. The proposed circuit employs delay buffer and series transistors to automatically turn off the startup circuit after the bias circuit has started. Thus, the proposed startup circuit consumes no power during the normal operation of the reference circuit and is useful for low-power...
This work presents a novel synchronization architecture for a 2times2 MIMO OFDM WLAN system. A new CORDIC-based sinusoidal iterative oscillator architecture is also implemented to recover the carrier frequency. The proposed design mainly enhances the traditional digital oscillator, which is a CORDIC-based architecture, and which is adopted at each accumulated phase. Compared to the iterative CORDIC...
Although the maximum transmission speed in IEEE 802.11a WLAN is 54 Mbps, the real throughput is actually limited to 20~30 Mbps. Except for the main effect from multi-path, we should also consider some non-ideal effects from imperfect hardware design, such as the IQ imbalance from direct conversion in RF front-end. IQ imbalance is not apparent in lower-order QAM modulation. However, in higher-order...
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