Analog front-end circuit of bioelectric sensor

A technology for simulating front-end circuits and bioelectric sensors, applied in amplifiers, electrical components, improving amplifiers to reduce nonlinear distortion, etc. Compensation for leakage current and other issues, to achieve the effect of suppressing reverse bias leakage current, small bandwidth, and low power consumption

Active Publication Date: 2020-09-18
CYZURTECH(SHANGHAI) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has some limitations: First, the input common-mode voltage is locked at half of the supply voltage, which reduces the degree of design freedom and increases the difficulty of designing low-supply voltage circuits
Second, the process needs to provide a P well, which makes the method more complicated and not suitable for the common single N well process
Third, the gate leakage current from the input differential pair of the feed-forward amplifier cannot be effectively compensated
Fourth, under different process, voltage and temperature conditions, it is difficult to spontaneously compensate the leakage current according to the environmental conditions
As shown in Figure 9, as the leakage current changes from zero Initially increasing to 100fA, the differential output voltage also increases linearly to 775mV, that is, the leakage current of the input tube of the feedforward amplifier all flows through the 1TΩ large resistor connected across, so this scheme does not have any effect of compensating the leakage current

Method used

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  • Analog front-end circuit of bioelectric sensor
  • Analog front-end circuit of bioelectric sensor
  • Analog front-end circuit of bioelectric sensor

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Embodiment Construction

[0071] The present invention provides an analog front-end circuit for a bioelectric sensor, such as Figure 10 As shown, it includes: a first feedforward amplifier 13a, a first feedback network 12a, a second feedforward amplifier 13b, and a second feedback network 12b.

[0072] The port of the first feedforward amplifier 13a includes a positive input port, a negative input port and an output port; the port of the second feedforward amplifier 13b includes a positive input port, a negative input port and an output port; the input end of the first feedback network 12a is the output port of the first feed-forward amplifier 13a, and the output end is the negative input port of the first feed-forward amplifier 13a, and the first feedback network 12a includes a span from its input end Receive the resistance of its output end; The input end of described second feedback network 12b is the output port of the second feedforward amplifier 13b, and the output end is the negative input port...

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Abstract

The invention provides an analog front-end circuit of a bioelectric sensor, which comprises two feed-forward amplifiers, feedback networks of the two feed-forward amplifiers, an output common-mode voltage detector, an error amplifier, a leakage current compensator and a resistance voltage divider, and can effectively suppress common-mode components of various leakage currents.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to an analog front-end circuit of a bioelectric sensor. Background technique [0002] The instrumentation amplifier is a precision differential voltage amplifier, which can provide high common-mode rejection ability and avoid the interference of large industrial power frequency (50Hz / 60Hz power frequency) in the environment; this interference is superimposed on the small DUT On the differential signal, the common mode part of the overall input signal is formed, usually reaching several Vpp, or even tens of Vpp. The instrumentation amplifier also provides matched high input impedance to avoid the problem that the differential signal cannot be truly extracted due to the load voltage division effect on the input signal source. In addition, the high input impedance can also reduce the common mode caused by the impedance mismatch of the differential signal source. Inhibition ability d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32
CPCH03F1/3223H03F3/45475H03F2200/261H03F2203/45138H03F3/45932H03F2203/45066H03F2203/45526H03F2203/45424H03F2203/45568H03F1/0205
Inventor 邓晨曦
Owner CYZURTECH(SHANGHAI) CO LTD
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