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A readout circuit for resistive and capacitive sensors

A resistive sensor, capacitive sensor technology, applied in the direction of using electric/magnetic devices to transmit sensing components, measuring resistance/reactance/impedance, components of electrical measuring instruments, etc., can solve the problem of increasing production costs and equipment power consumption, etc. problem, to achieve the effect of reducing the size

Active Publication Date: 2019-04-30
INFINEON TECH AG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The corresponding readout electronics must be adapted to each sensor, which means that different analog readout systems must be designed and implemented, which increases production costs and power consumption of the device

Method used

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  • A readout circuit for resistive and capacitive sensors
  • A readout circuit for resistive and capacitive sensors
  • A readout circuit for resistive and capacitive sensors

Examples

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Embodiment Construction

[0022] figure 1 An ASIC 100A is shown comprising, in relevant part, a voltage-to-current converter 102 coupled to an integrator 104 which is in turn coupled to a logic circuit 106 as will be described in further detail below. In the first mode of operation, the dual-node input 108 is coupled to the variable resistor R SENS , which represents a resistive sensor, and the dual-node input 110 is coupled to a fixed capacitor C REF , which represents the capacitive reference. Thus, the ASIC 100A is configured to read out data based on the change in resistivity of the resistive sensor.

[0023] figure 2 An ASIC 100B is shown comprising, in relevant part, a voltage-to-current converter 102 coupled to an integrator 104 which in turn is coupled to logic circuitry 106 as will be described in further detail below. In the second mode of operation, the dual-node input 108 is coupled to a fixed resistor R REF , which represents the resistive reference, and the dual-node input 110 is c...

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Abstract

A readout circuit for resistive and capacitive sensors includes a first input coupled to a reference resistor in a first mode of operation and coupled to a resistive sensor in a second mode of operation; a second input coupled to a capacitive sensor in the first mode of operation and coupled to a reference capacitor in the second mode of operation; and an output for providing a capacitive sensor data stream in the first mode of operation and for providing a resistive sensor data stream in the second mode of operation.

Description

technical field [0001] The present invention generally relates to readout circuits for resistive and capacitive sensors. Background technique [0002] A trend in modern consumer electronics is to integrate many different sensors (such as pressure, temperature, gas, humidity, and microphones) into a single device. Each sensor is based on a different physical principle, which converts a different amount of electricity to be detected (mainly resistance and capacitance). The corresponding readout electronics have to be adapted to each sensor, which means that different analog readout systems have to be designed and implemented, which increases production costs and power consumption of the device. [0003] Capacitive sensors are typically coupled to a high-ohmic readout interface, switched capacitor amplifier, or charge sense amplifier. [0004] Resistive sensors are typically coupled to readout circuits based on simple voltage divider and Wheatstone bridge structures when the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/24G01D5/16G01D11/00
CPCG01D5/16G01D5/24G01D11/00G01R27/02G01R27/2605G01R1/30G01R15/005G01R19/25G05F1/561H03F1/30
Inventor R·加格尔A·巴齐罗托C·巴法F·西西奥蒂
Owner INFINEON TECH AG