Improved Fast Readout Circuit of Two-Dimensional Resistor Array

Abstract

The invention provides an improved rapid reading circuit for a two-dimensional resistor array, and the reading circuit comprises a controller, the two-dimensional resistor array sharing row lines and column lines, a measured unit measurement circuit, a standard resistor row, and an auxiliary measurement circuit. The two-dimensional resistor array comprises two groups of orthogonal lines serving as the common row lines and column lines, and a resistor unit array which is arranged in an M*N two-dimensional structure. The controller provides a drive signal for each column of the resistor array, and the measured unit measurement circuit measures the resistance value of the measured unit of the current column. The auxiliary measurement circuit measures a selected standard resistance value. The circuit can read the resistance values of one column of the measured two-dimensional resistor array at the same time, also can effectively reduce the impact on a measurement result from other resistor units, except the current measured resistor unit, in the two-dimensional resistor array, the conduction resistance of the controller and the voltage change of the controller.

Description

technical field [0001] The invention relates to an improved fast readout circuit of a two-dimensional resistance array, which belongs to the technical field of circuits. Background technique [0002] Robotic tactile sense is the most important one in the non-visual sensing system (tactile sense, force sense, sliding sense, proximity sense, thermal sense, etc.) of the robot. Identify parameters of significant value. The sense of touch can also provide auxiliary information for other sensing systems such as vision, so as to improve the overall environment perception ability of the robot. The research on robot haptics started late, and the design and manufacturing technology of tactile sensors are not yet perfect, and correspondingly, the processing methods of tactile information have also been neglected. Abroad began systematic research on tactile sensors and their information processing methods in the early 1980s, and our country also launched research work in the 1990s. M...

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Problems solved by technology

[0006] figure 1 In the general zero-potential method circuit adopted, due to the change of the internal resistance of the multiplexer and the reference voltage of the column where the resistance unit is located, the voltage at both ends of the unit under test is inconsistent with the ideal reference voltage, resulting in the sampling resistance in the measurement circuit of the unit under test. The current on is not consistent with the ideal current, so additional error will be introduced

[0007] Regarding the detection research of resistive sensing array, in 2009, a 32×32 array temperature and tactile sensing array was proposed (Yang Y J, Cheng M Y, Shih S C, et al.A 32×32temperature and tactilesensing array using PI -copper films.The International Journal of Advanced Manufacturing Technology,2010,46(9-12):945-956.), Artificial skin for robotic arm, adding multiplexers in the array network, row selection and column selection speed It is greatly accelerated, and the maximum detection rate is as high as 3,000 pixels per second. However, in order to ensure the detection accuracy and shield the interference of non-resistors in the array, the circuit introduces an operational amplifier circuit in each column of the array. The circuit is complex and multiple operations at the same time Small differences in amplification performance can also lead to poor consistency of measurement results across multiple channels

In 2011, Wu et al. (Wu Jianfeng, Wang Lei, Li Jianqing, et al. An array-type small-size temperature sensing device. Journal of Sensing Technology, 2011, 24(11): 1649-1652.) developed an 8×16 array An array-type small-size temperature sensing device uses array-type tiny thermistors for temperature sensing, and proposes a feedback isolation drive measurement method for array resistance detection. This method has the interference of row and column multi-channel switch resistance, which affects Measurement accuracy of the measured resistance

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