A Quasi-digital QPSK Modulator Design for Biomedical Devices
A Quasi-digital QPSK Modulator Design for Biomedical Devices
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DOI：
10.1145/3465379
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发表时间：
2022-03
期刊：
影响因子：
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通讯作者：
Dawei Li;Yang Zhou;Shaoping Chen;Xiaowei Xu
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文献类型：
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作者：
Dawei Li;Yang Zhou;Shaoping Chen;Xiaowei Xu
对于生物医学收发器，数据传输往往是不对称的。在下行链路，收发器只需要接收一个简单的命令就可以控制外部设备的运行，而且接收数据速率很低，大约几百Kb/s。然而，由诸如温度传感器、压力传感器或相机的外部设备收集的数据通常非常大，这导致几Mb/s的传输数据速率。因此，需要高能量效率的调制器。与传统的数字调制器相比，模拟调制器电路在高数据速率下表现出上级能量效率。本文提出了一种用纯模拟电路实现的准数字正交相移键控（QPSK）调制器的设计方法。仿真结果表明，该系统能够产生64 MHz的稳定载波，满足10 Mb/s数据传输速率的体内通信（IBC）要求。当高斯信道的信噪比（SNR）为14 dB时，它仍然可以保持误码率（BER）低于104。
For the biomedical transceiver, the data transmission is often asymmetric. At the downlink, the transceiver only needs to receive a simple command to control the operation of the external device, and the receiving data rate is low, about hundreds of Kb/s. However, data collected by external devices such as temperature sensors, pressure sensors, or cameras are often very large, which results in a transmitting data rate of several Mb/s. Therefore, a high energy-efficient modulator is needed. Compared with conventional digital modulator, analog modulator circuits have demonstrated superior energy efficiency at high data rates. This article presents a quasi-digital quadrature phase-shift keying (QPSK) modulator design realized by pure analog circuits which follows a logic design flow. The simulation results show that the system can generate a stable carrier of 64 MHz that meets intra-body communications (IBCs) requirements with a data transmission rate of 10 Mb/s. When the signal-to-noise ratios (SNRs) of the Gaussian channel is 14 dB, it can still maintain a bit error rate (BER) below 104.