使用共享模拟CMOS前端扩展频谱调制多通道生物信号采集
IEEE transactions on biomedical circuits and systems
|September 19, 2023
概括
这项研究引入了一种新的扩散频谱生物信号采集系统,可以减少多通道医疗设备的功率和电线数量. 创新的设计实现了心房电图的高性能,使得门诊和侵入性监测更有效.
科学领域:
- 生物医学工程 生物医学工程
- 集成电路设计 集成电路设计
- 信号处理 信号处理
背景情况:
- 设计用于门诊或侵入性医疗应用的多通道生物信号采集系统面临电力消耗,面积和电线数量的挑战.
- 高频道数量加剧了这些设计限制,影响了设备的便携性和成本.
研究的目的:
- 提出和验证一个扩散频谱调制的生物信号采集系统,以应对功率,面积和电线数量的挑战.
- 根据SNR,输入数和区域要求,开发一个设计方法来优化记录系统.
- 为了展示一种低功耗,紧的模拟前端,用于高通道计数生物信号采集.
主要方法:
- 采用了使用共享放大器和模拟数字转换器 (ADC) 的扩频调制技术.
- 开发了一种设计方法,以优化记录系统的特定应用需求 (SNR,输入数量,区域).
- 用511的代码长度的伪随机二进制序列 (PRBS) 代码用于16个输入,并在0.18μm CMOS过程中实现了4个输入的模拟前端.
主要成果:
- 该系统在预先记录的心房电图上,在鼻节律 (SR) 中获得了2.65%的平均百分比根-平均-平方差 (PRD),在心房动 (AF) 中达到3.02%的平均百分比根-平均-平方差.
- 实现的4输入模拟前端显示了 4:1的输入到输出线比.
- 该系统实现了23μA/输入的低功耗和0.067mm2的小面积.
结论:
- 拟议的扩散频谱生物信号采集系统有效地减少了高频道应用的功耗,面积和输出线数.
- 设计方法允许针对特定医疗监测要求进行系统优化.
- 实施的CMOS模拟前端验证了用于先进生物信号采集的扩散频谱方法的可行性和效率.
相关概念视频
Small-Signal Analysis of MOSFET Amplifiers
594
In small-signal analysis, a MOSFET transistor amplifier acts as a linear amplifier when operating in its saturation region. The gate-to-source voltage (VGS) of the MOSFET is the sum of the DC biasing voltage and the small time-varying input signal. This combination sets up the operating point and modulates the drain current (ID) that flows from the drain to the source. When a small AC signal is superimposed on the DC bias voltage at the gate, the instantaneous drain current comprises three...
594
Instrumentation Amplifier
564
An electrocardiography (ECG) machine is an essential piece of medical equipment used to monitor the electrical activity of the heart. It operates by detecting small electrical changes on the skin that result from the depolarization of the heart muscle during each heartbeat. However, these signals are in the microvolt range and can be easily overwhelmed by noise or interference.
To overcome this challenge, an ECG machine utilizes an instrumentation amplifier. This specialized amplifier is...
To overcome this challenge, an ECG machine utilizes an instrumentation amplifier. This specialized amplifier is...
564
MOSFET Amplifiers
185
The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
185
Cascaded Op Amps
663
Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
663


