Two-dimensional resistor array fast readout circuit

Abstract

The invention provides a rapid reading circuit for a two-dimensional resistor array, and the reading circuit comprises a column multipath selector, the two-dimensional resistor array sharing row lines and column lines, a scanning controller, 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 which respectively serve as a common row line and a common column line, and a resistor unit array which is arranged in an M*N two-dimensional structure. The scanning controller outputs a column scanning control signal, and the column scanning control signal is used for controlling the column multipath selector. The measured unit measurement circuit measures the resistance value of a measured unit of a current column. The auxiliary measurement circuit measures a selected standard resistance value. The circuit can read one-dimensional resistance values of the 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 internal resistance of the column multipath selector and the voltage jitter of a reference power supply.

Description

technical field [0001] The invention relates to a fast readout circuit of a two-dimensional resistance array, belonging 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. Most of the pre...

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Problems solved by technology

[0006] figure 1 In the general zero-potential method circuit adopted, the voltage at both ends of the measured unit is inconsistent with the ideal reference voltage due to changes in the internal resistance of the multiplexer and the reference voltage of the column where the measured resistance unit is located, resulting in the sampling resistance of the measured unit measuring circuit. 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 32×32 temperature 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 The speed 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 Small differences in op amp 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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