Abstract

This paper presents a new pulse shaping technique to achieve an improved and optimized power spectral density for wireless body area network applications. A half sine-offset quadrature phase shift keying modulation is chosen to approach the standard demands on a direct modulation transmitter. Proposed technique is based on the direct multiplexing architecture and is implemented with nearly passive elements. A switched-resistor based structure which works with cooperating of digital pulse generator (DPG), acts as a semi-digital filter for half-sine pulse shaping. Besides, this technique has the capability of being implemented in any data rates up to 50 Mbps by applying a phase locked loop in DPG block. For the first side lobes of power spectral density − 26 dBc is achievable by using this technique; while the proposed modulator consumes just 200 uA current from power supply. Post layout simulation results show the adjacent channel power ratio of − 30 dBc for OQPSK modulation at 50 Mbps and maximum output power is − 9 dBm. The transmitter consumes the power of 5.7 mW from 1.5 V power supply.

中文翻译：

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一种新的基于直接多路复用的直接脉冲整形思想，用于生物医学应用中带宽高效的OQPSK发射机

摘要

本文提出了一种新的脉冲整形技术，以实现针对无线人体局域网应用的改进和优化的功率谱密度。选择半正弦偏移正交相移键控调制来满足直接调制发射机的标准要求。提出的技术基于直接多路复用架构，并以几乎无源的元件实现。基于开关电阻的结构可与数字脉冲发生器（DPG）协同工作，用作半正弦脉冲整形的半数字滤波器。此外，通过在DPG块中应用锁相环，该技术具有以高达50 Mbps的任何数据速率实现的能力。对于第一个旁瓣，功率谱密度为-26 dBc，可通过使用该技术实现；而拟议的调制器仅从电源消耗200 uA电流。布局后的仿真结果表明，对于50 Mbps的OQPSK调制，相邻信道的功率比为− 30 dBc，最大输出功率为− 9 dBm。发送器通过1.5 V电源消耗5.7 mW的功率。