Chen Du, Harris John G, Principe Jose C
Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL, USA.
Conf Proc IEEE Eng Med Biol Soc. 2004;2004:4071-4. doi: 10.1109/IEMBS.2004.1404136.
A low-power fully integrated bioamplifier is presented that can amplify signals in the range from mHz to kHz while rejecting large DC offsets generated at the electrode-tissue interface. The novel aspect of this amplifier is that its analog output is represented by a series of pulses which provide a low-power, noise-resistant means for coding and transmission. The original analog signal can be reconstructed from the resulting pulse train with 13 bit precision at a remote site where power consumption is not so crucial. The fabricated analog amplifier exhibits a gain of 39.5 dB from 0.3 Hz to 5.4 kHz. The power consumption of the whole system is less than 300 microW/channel from a 5-V supply. The fully integrated system was designed in the AMI 0.6 microm CMOS process and it consumes 0.088 mm(2) channel of chip area.
本文介绍了一种低功耗全集成生物放大器，它能够放大从毫赫兹到千赫兹范围内的信号，同时抑制在电极 - 组织界面产生的大直流偏移。该放大器的新颖之处在于其模拟输出由一系列脉冲表示，这些脉冲为编码和传输提供了一种低功耗、抗噪声的方式。原始模拟信号可以在功耗不太关键的远程站点以13位精度从所得脉冲序列中重建。所制造的模拟放大器在0.3Hz至5.4kHz范围内具有39.5dB的增益。整个系统从5V电源供电时，每通道功耗小于300微瓦。该全集成系统采用AMI 0.6微米CMOS工艺设计，每通道占用0.088平方毫米的芯片面积。
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