A Linear Readout Circuit for Two-dimensional Resistive Sensing Array

Abstract

The invention discloses a linear reading circuit for a two-dimensional resistive sensing array. The linear reading circuit for a two-dimensional resistive sensing array includes a two-dimensional resistive sensing unit array, a row multi-path selector, a column multi-path selector, a scanning controller, a negative feedback operational amplifier and a test current setting circuit, wherein the two-dimensional resistive sensing unit array shares row lines and column lines; the two-dimension resistive sensing unit array includes two groups of orthogonal lines which are respectively used as the common row lines and the common column lines, and a resistive sensing unit array which is distributed according to an M*N two-dimensional structure; the scanning controller outputs row / column scanning control signals; the row scanning control signal controls the row multi-path selector; the column scanning control signal controls the column multi-path selector; and the test current setting circuit uses a resistor RS. The linear reading circuit for a two-dimensional resistive sensing array can linearly read the tested two-dimensional resistive sensing unit array, and can also effectively reduce the interference on the measuring result from the other resistive sensing units, the internal resistance of the row multi-path selector and the internal resistance of the column multi-path selector except for the current tested resistive sensing unit.

Description

technical field [0001] The invention relates to a linear readout circuit of a two-dimensional resistive sensing array, belonging 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 forward higher requirements for the temperature me...

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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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