Readout circuit and readout method of two-dimensional resistive sensing array based on zero potential method

Abstract

The invention relates to a zero potential method-based readout circuit and readout method of a two-dimensional resistive sensing array. The readout circuit includes a two-dimensional resistive sensing unit array which shares row lines and column lines, a row multiplexer, a column multiplexer, a scanning controller, a resistance sampling circuit and a ground line current sampling circuit; sensitive sensing units in the two-dimensional resistive sensing unit array are distributed according to an M*N two-dimensional structure; and the scanning controller controls the row multiplexer and the column multiplexer to make the row multiplexer and the column multiplexer complete the selection of any one resistive sensing unit to be tested. According to the readout circuit, an extra ground line current sampling circuit is installed on an ordinary zero potential method-based two-dimensional resistive sensing array readout circuit, wherein the ground line current sampling circuit includes an operational amplifier and a resistor. Under the combined action of the ground line current sampling circuit and the measurement method of a measured resistive sensing unit, interference on the current measured resistive sensing unit, caused by other resistive sensing units in the two-dimensional resistive sensing array, and the inner resistance of the row multiplexer and the column multiplexer, can be effectively reduced.

Description

technical field [0001] The invention relates to a readout circuit and a readout method of a two-dimensional resistive sensing array based on a zero-potential method, and belongs to the technical field of circuits. Background technique [0002] The array sensing device is to combine multiple sensing elements with the same performance according to the structure of a two-dimensional array. It can change or generate corresponding shapes and characteristics by sensing changes in parameters focused on the array. This feature is widely used in biosensing, temperature tactile and thermal imaging based on infrared sensors, etc. [0003] Resistive sensing arrays are widely used in infrared imaging simulation systems, force tactile sensing and temperature tactile sensing. Taking temperature touch as an example, since the temperature sensing device involves the transfer of heat and the perception of temperature, in order to obtain the thermal properties of the object, the device puts f...

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Problems solved by technology

Verification using a 16×16 array network bolometer array, using only 32 pins, has confirmed that the model can effectively resolve device damage or small changes in device value, but it is not suitable for other parameters in the row and column of the device under test. The crosstalk of components does not play a good role in isolation

In 2009, Y.J.Yang et al. proposed a 32×32 array of temperature and tactile sensing arrays for the artificial skin of the robotic arm. A multiplexer was added to the array network, and the speed of row selection and column selection was greatly accelerated. The maximum detection The rate is as high as 3,000 pixels per second, but in order to ensure the detection accuracy and shield the interference of non-tested resistors in the array, the circuit introduces an operational amplifier circuit in each column of the array. The circuit is complex, and the small difference in the performance of multiple operational amplifiers Also leads to poor consistency of measurement results across multiple channels

However, it does not shield the interference of the internal resistance of the column multiplexer and the adjacent resistance on the column line where the measured resistance is located, and does not realize the adjacent resistance of the row line and the column line where the measured resistance is located. Isolation from internal resistance of row and column multiplexers

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