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Programmable Gain Amplifiers with DC Suppression and Low Output Offset for Bioelectric Sensors

机译:用于生物电传感器的具有直流抑制和低输出失调的可编程增益放大器

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摘要

DC-offset and DC-suppression are key parameters in bioelectric amplifiers. However, specific DC analyses are not often explained. Several factors influence the DC-budget: the programmable gain, the programmable cut-off frequencies for high pass filtering and, the low cut-off values and the capacitor blocking issues involved. A new intermediate stage is proposed to address the DC problem entirely. Two implementations were tested. The stage is composed of a programmable gain amplifier (PGA) with DC-rejection and low output offset. Cut-off frequencies are selectable and values from 0.016 to 31.83 Hz were tested, and the capacitor deblocking is embedded in the design. Hence, this PGA delivers most of the required gain with constant low output offset, notwithstanding the gain or cut-off frequency selected.
机译:直流偏移和直流抑制是生物电放大器中的关键参数。但是,通常不解释特定的DC分析。有几个因素会影响DC预算:可编程增益,用于高通滤波的可编程截止频率,低截止值和所涉及的电容器阻塞问题。提出了一个新的中间阶段来完全解决DC问题。测试了两种实现。该级由具有直流抑制和低输出失调的可编程增益放大器(PGA)组成。截止频率是可选的,并且测试了从0.016到31.83 Hz的值,并且电容器去块化被嵌入到设计中。因此,尽管选择了增益或截止频率,该PGA仍可提供恒定的低输出失调所需的大部分增益。

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