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A Low Noise Amplifier for Bioelectricity Detection

A low-noise amplifier, bio-electric technology, applied in the direction of amplifier combination, improving amplifiers to reduce noise effects, etc., can solve problems such as inability to guarantee signal quality, DC offset cancellation of circuit electrodes, poor noise performance, etc.

Active Publication Date: 2020-12-22
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the limitation of its structure, it is difficult for the current traditional low-noise amplifier to offset the electrode DC offset in the circuit. At the same time, the noise performance of the traditional low-noise amplifier is poor, and it cannot guarantee the poor quality of the received signal.

Method used

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  • A Low Noise Amplifier for Bioelectricity Detection
  • A Low Noise Amplifier for Bioelectricity Detection
  • A Low Noise Amplifier for Bioelectricity Detection

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0065]Seefigure 1 ,figure 1 It is a circuit structure diagram of a low noise amplifier for bioelectric detection provided by an embodiment of the present invention. The low noise amplifier is suitable for the analog front-end circuit of bioelectric detection, including: input chopper circuit 1, input coupling capacitor module 2, two-stage operational amplifier module 3, capacitor negative feedback loop 4, positive feedback input impedance boost loop 5 and the electrode DC offset elimination loop 6, in which the two-stage operational amplifier module 3 is a low-noise two-stage operational amplifier module.

[0066]The input chopper circuit 1 includes a first chopper switch CH1. The first input terminal and the second input terminal of the first chopper switch CH1 are electrically connected to the first electrode and the second electrode of the analog front-end circuit to receive the input low-frequency signal Vin. , And the first chopper switch CH1 modulates the input low frequency sign...

Embodiment 2

[0074]Seefigure 1 ,figure 1 The two-stage operational amplifier module 3 includes: a first operational amplifier OP1, a second chopper switch CH2, a second operational amplifier OP2, a first PMOS tube PM1, a second PMOS tube PM2, a third PMOS tube PM3, and a fourth PMOS tube. The tube PM4, the first Miller compensation capacitor Cc1, the second Miller compensation capacitor Cc2, the first zero adjustment resistor RZ1, and the second zero adjustment resistor RZ2. among them,

[0075]The non-inverting input terminal and the inverting input terminal of the first operational amplifier OP1 are correspondingly electrically connected to the non-inverting input terminal and the inverting input terminal of the two-stage operational amplifier module 3, and the inverting output terminal and the non-inverting output terminal of the first operational amplifier OP1 are correspondingly electrically connected At the first input terminal and the second input terminal of the second chopper switch CH2, t...

Embodiment 3

[0086]Seefigure 1 ,figure 1 The electrode DC offset cancellation loop 6 includes: a third operational amplifier OP3, a fourth operational amplifier OP4, a third resistor R3, a fourth resistor R4, a fifth resistor R5, an integrator INT, a fourth chopper switch CH4, A coupling capacitor Chp1 and a second coupling capacitor Chp2. among them,

[0087]The inverting input terminal of the third operational amplifier OP3 is electrically connected to its output terminal to form a unity gain amplifier, and the non-inverting input terminal of the third operational amplifier OP3 is electrically connected to the non-inverting output terminal of the two-stage operational amplifier module 3; the inverting terminal of the fourth operational amplifier OP4 The input terminal is electrically connected to its output terminal to form a unity gain amplifier, the non-inverting input terminal of the fourth operational amplifier OP4 is electrically connected to the inverting output terminal of the two-stage op...

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Abstract

The invention relates to a low-noise amplifier for bioelectricity detection. The low-noise amplifier comprises an input chopper circuit (1), an input coupling capacitor module (2), a two-stage operational amplifier module (3), a capacitance negative feedback loop (4), a positive feedback input impedance lifting loop (5) and an electrode direct-current offset elimination loop (6). According to thelow-noise amplifier, the noise coefficient of the low-noise amplifier is improved by adopting the two stages of operational amplifier modules for current multiplexing; the noise performance of the low-noise amplifier is further improved, meanwhile, the direct-current offset voltage between electrodes in the analog front-end circuit is restrained through the electrode direct-current offset eliminating loop, and therefore the quality of signals received by the analog front-end circuit is guaranteed.

Description

Technical field[0001]The invention belongs to the technical field of biomedical electronics, and specifically relates to a low noise amplifier for bioelectric detection.Background technique[0002]Nowadays, portable medical equipment and wireless body area network technology have received more and more attention. The bioelectric detection analog front-end circuit is an important part of wearable medical equipment. Its main function is to amplify, filter and digitally process small amplitude and low frequency bioelectric signals. In the analog front-end circuit, the low-noise amplifier directly affects the quality of the received signal and determines the noise performance of the entire circuit.[0003]However, the current traditional low-noise amplifier is difficult to offset the DC offset of the electrodes in the circuit due to its structural limitation. At the same time, the traditional low-noise amplifier has poor noise performance and cannot guarantee the poor quality of the receive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/26H03F3/68
CPCH03F1/26H03F3/68
Inventor 李娅妮张腾飞王硕朱樟明杨银堂
Owner XIDIAN UNIV