一个7mHz - 6.29Hz可配置的高通模拟前端,具有直接道偏差和输出直流伺服循环
IEEE transactions on biomedical circuits and systems
|December 29, 2025
概括
这项研究介绍了一种新的模拟前端,可调节的高通波从7mHz到6.29Hz. 它通过使用先进的直流伺服循环技术实现了超低的切断频率和高的输入阻抗.
科学领域:
- 模拟电路设计 模拟电路设计
- 生物医学电子产品
- 在CMOS集成电路中.
背景情况:
- 在各种应用中,非常低频率的准确信号采集是至关重要的.
- 传统的模拟前端在实现超低切断频率和高输入阻抗同时面临挑战.
- 保持直流操作点的稳定性对于可靠的模拟信号处理至关重要.
研究的目的:
- 引入一种新的容量合模拟前端,具有可调节的高通断路频率.
- 为了实现7mHz的超低高通断路频率.
- 为了提高低频信号采集的输入阻抗和稳定性.
主要方法:
- 用直流道 (DT) 电流的动态平衡来设置直流操作点.
- 实现一个输出直流伺服循环 (O-DSL) 与一个工作循环运行传导放大器 (DC-OTA) 和一个数字辅助传导放大器 (DA-OTA).
- 采用正反电容器和双循环控制机制,以改善输入阻抗.
主要成果:
- 通过使用DC-OTA技术,达到低至0.18 pA/V的等效透导率.
- 启用了7mHz的高通断路频率,并使用了6 pF的芯片集成电容器.
- 在30毫秒的校准时间内,在50Hz时提升输入阻抗到5.2GΩ.
- 采用180纳米CMOS工艺制造,低电流消耗 (3.01μA) 和6.37 NEF.
结论:
- 开发的模拟前端成功实现了超低频过和高输入阻抗.
- 在O-DSL中集成DC-OTA和DA-OTA技术为稳定的直流运行提供了强大的解决方案.
- 这种设计为各种电子系统中敏感的低频信号采集提供了有前途的解决方案.
相关概念视频
Biasing of FET
648
Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
648
Cut-off Frequency of BJT
1.3K
Cut-off frequencies in Bipolar Junction Transistors (BJTs) mark the transition between the signal's pass band and stop band, influencing their performance in amplifying or attenuating frequencies. These frequencies are crucial for designing BJTs to meet specific operational requirements in electronic circuits.
Alpha Cut-Off Frequency: Pertinent to the common-base configuration, the alpha cut-off frequency defines the upper-frequency limit at which the current gain, alpha, remains stable. As...
Alpha Cut-Off Frequency: Pertinent to the common-base configuration, the alpha cut-off frequency defines the upper-frequency limit at which the current gain, alpha, remains stable. As...
1.3K
Cascaded Op Amps
1.1K
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...
1.1K
MOSFET Amplifiers
457
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...
457
Design Example: Vintage Mixing Console
528
A sound engineer at a music company recently encountered a problem. The output from their newly acquired studio's vintage mixing console was too low for the requirements of modern recording equipment. To rectify this situation, the engineer decided to design an audio pre-amplifier using an operational amplifier (op-amp) to boost the signal level.
The specifications for the pre-amplifier were clear. It needed to amplify the audio signal by a factor of 10, have an input impedance above 10...
The specifications for the pre-amplifier were clear. It needed to amplify the audio signal by a factor of 10, have an input impedance above 10...
528
Frequency Response of Op Amp Circuits
609
Operational amplifiers (op-amp) are used in signal conditioning, filtering, or for performing mathematical operations such as addition, subtraction, integration, and differentiation. The frequency response of an op-amp is an important aspect that describes how the gain of the amplifier varies with frequency.
Frequency Response and Gain:
The gain of the op-amp, A(ω), is not a constant but a function of the input signal frequency. An op-amp can maintain a constant gain at low frequencies, known...
Frequency Response and Gain:
The gain of the op-amp, A(ω), is not a constant but a function of the input signal frequency. An op-amp can maintain a constant gain at low frequencies, known...
609


