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Analog front-end sensing amplifier for portable health monitoring device

A technology of health monitoring and analog front-end circuit, which is applied in the direction of amplifier combination, amplifier input/output impedance improvement, amplification control, etc., can solve problems such as poor ripple suppression effect, improve gain accuracy, increase input impedance, and prevent Effect of Impedance Improvement

Pending Publication Date: 2022-07-29
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The positive feedback input impedance enhancement technology can greatly increase the input impedance, but due to the influence of parasitic capacitance, it is necessary to precisely adjust the feedback capacitance to prevent the circuit from oscillating, and the ripple suppression effect is not good.
Neither of the above two solutions can solve the ripple or trimming problem in the process of increasing the input impedance of the chopper-modulated AFE.

Method used

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  • Analog front-end sensing amplifier for portable health monitoring device
  • Analog front-end sensing amplifier for portable health monitoring device
  • Analog front-end sensing amplifier for portable health monitoring device

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Embodiment Construction

[0050] The present invention is further described in detail below with reference to the accompanying drawings, but the protection scope of the present invention should not be limited by this. see figure 1 and 2 , the present invention includes a capacitively coupled instrumentation amplifier, a gain programmable amplifier and a band-pass filter; the capacitively coupled instrumentation amplifier includes: a first buffer, a first chopper switch, a second chopper switch, a third chopper switch, Fourth chopper switch, fifth chopper switch, sixth chopper switch, first input capacitor, second input capacitor, first feedback capacitor, second feedback capacitor, third feedback capacitor, fourth feedback capacitor, first an adjustable capacitor, a second adjustable capacitor, a first feedback resistor, a second feedback resistor, a first transconductance amplifier, a second transconductance amplifier, a first DC servo loop, a ripple elimination loop, and a self-calibration module; ...

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Abstract

An analog front-end circuit for a portable health monitoring device is characterized by comprising a capacitive coupling instrumentation amplifier, a gain programmable amplifier and a band-pass filter. A pre-charging loop composed of a first buffer and a second chopping switch is adopted, a positive feedback loop is composed of a first adjustable capacitor, a second adjustable capacitor and a third chopping switch, and the pre-charging loop and the positive feedback loop are used for impedance enhancement and work in the circuit at the same time, so that the input impedance is greatly improved. The self-calibration module is used for preventing the problem of circuit oscillation possibly caused by impedance improvement; meanwhile, the gain of the programmable gain amplifier is calibrated by using the same calibration logic, and the gain precision of the analog front-end circuit is improved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to an analog front-end sensing circuit for a portable health monitoring device. Background technique [0002] With the deep integration of microelectronics and biomedicine, portable health monitoring equipment represented by ECG stickers and sports chest straps has developed rapidly. The use of these devices to achieve long-term real-time health monitoring will play a major role in the prevention and control of chronic diseases and sports health. [0003] Portable health monitoring equipment is a biological signal acquisition terminal system that integrates functions such as energy management, signal perception and data transmission. The precise perception of signals is the basis of biological signal acquisition. Limited by the battery size of portable devices, researching the analog front-end sense amplifier (AFE) with low power consumption, low noise and ...

Claims

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Application Information

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IPC IPC(8): H03F1/56H03F3/68H03G3/00H03G3/30
CPCH03F1/56H03F3/68H03G3/008H03G3/30
Inventor 赵阳索研星连勇
Owner SHANGHAI JIAO TONG UNIV
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