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Sensor interface devices and amplifiers

A sensor interface and amplifier technology, applied in analog conversion, electrical components, code conversion, etc., can solve problems such as input signal bandwidth limitation, and achieve the effect of reducing DC offset and flash noise, and eliminating DC offset and flash noise.

Inactive Publication Date: 2011-05-25
THE CHINESE UNIVERSITY OF HONG KONG
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The disadvantage of the nested chopping technique is that the bandwidth of the input signal is limited since the outer chopping operates at very low frequencies

Method used

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  • Sensor interface devices and amplifiers
  • Sensor interface devices and amplifiers
  • Sensor interface devices and amplifiers

Examples

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Embodiment Construction

[0022] The accompanying drawings are for exemplary purposes only and are not intended to limit the present application, and the present application will be described below in conjunction with the accompanying drawings.

[0023] figure 1 is a block diagram of a sensor interface device 100 according to the present application, including a first chopper 1, a measurement amplifier (IA) 2, a bandpass (BP) Delta-Sigma (Delta-Sigma) analog-to-digital converter, a second chopper 4 and decimation filter 5.

[0024] The sensor interface device receives a voltage mode input signal. Specifically, such as figure 1 As shown, the first chopper 1 operates at f chop frequency, receive the input signal, convert the received input signal from baseband to f chop . Here, the first chopper is an analog chopper, and f chop Must be much greater than the corner frequency of the flicker noise in this system.

[0025] IA2 receives the output of chopper 1 and amplifies it. The amplification gain ...

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Abstract

Disclosed are a sensor interface device and an amplifier used in a sensor system. The sensor interface device in one implementation has a first chopper configured to shift input signals of the sensor system from a baseband frequency to a first frequency, an instrumentation amplifier configured to amplify the shifted signals, a bandpass Delta-Sigma analog to digital converter configured to digitize the amplified signals, and a second chopper configured to shift the digitized signals from the a first frequency back to the baseband frequency. The instrumentation amplifier removes the DC offset generated from the first chopper and therefore all sources of DC offset are eliminated in this interface device without bandwidth limitation.

Description

technical field [0001] The present invention relates generally to sensor interface devices and amplifiers. In particular, the present invention relates to sensor interface devices for reducing DC offset and flicker noise. Background technique [0002] Sensor systems are widely used in industrial and medical electronics, where sensor interface devices that enable connections between the sensors of the sensor system and other components of the same system are crucial. [0003] The sensor system to which the present invention relates has two common features. First, the output signal of the sensor in the sensor system is a voltage quantity, and the output signal has a small amplitude. For example, a resistive bridge gauge sensor (bridge gauge sensor) usually produces a peak range voltage of about tens of microvolts (mini-volt) and an EEG signal with an amplitude of less than 1 μV. Second, the output signal has a low bandwidth, or in most cases a medium bandwidth. For example...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M3/00
CPCH03M3/34H03M3/458
Inventor 潘江鹏蔡潮盛
Owner THE CHINESE UNIVERSITY OF HONG KONG
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