Non-ideal factor correction system for bridge type sensor

Abstract

The invention provides a non-ideal factor correction system for a bridge sensor, which comprises an output buffer, a linearization circuit and a temperature correction circuit, and is characterized in that the input end of the temperature correction circuit is connected with the output of a pressure sensor and an external temperature signal; the temperature correction circuit comprises an output gain amplifier, a temperature ADC, a temperature lookup table and control logic module, a gain DAC, a zero DAC and a first summation module, the output end of the temperature correction circuit is connected with the input end of the output buffer, and the output end of the output buffer is connected with the input end of the linearization circuit; according to the invention, the excitation voltage of the sensor is changed through the linearization circuit, so that good linearization is realized, the problems of large area overhead, easiness in being influenced by temperature gradient, high cost, low precision and the like in the prior art are solved, and a good temperature drift correction effect is realized by carrying out zero compensation and range correction on the output through the temperature correction circuit.

Description

technical field [0001] The invention relates to the technical field of integrated circuit design applied to signal conditioning of piezoresistive pressure sensors, in particular to a non-ideal factor correction system for bridge sensors. Background technique [0002] Silicon piezoresistive sensors, which are widely used in the field of pressure measurement, generally have problems such as consistency, temperature drift and nonlinearity due to the inherent characteristics of the semiconductor materials used. In use, it must go through the compensation and correction process of the output signal, and the compensation and correction technology directly determines its use value. [0003] The existing correction techniques for temperature non-ideal characteristics include: [0004] The hardware compensation technology mainly includes series-parallel resistance, thermistor network, diode compensation and temperature compensation using circuit. However, using this method mainly h...

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Problems solved by technology

[0011] In view of the above problems, the purpose of the present invention is to propose a non-ideal factor correction system for bridge sensors, the non-ideal factors for bridge sensors The rectification system has the advantage of good linearization, which effectively solves the problems of large area cost, easy to be affected by temperature gradient, high cost and low precision in the prior art

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