Digital calibrating method of sensor signal conditioning circuit
A signal conditioning circuit, sensor signal technology, applied in instruments and other directions, can solve the problems of complex compensation circuits, calibration, difficult nonlinear coefficients, etc.
Inactive Publication Date: 2008-12-24
豪威国际控股有限公司
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Problems solved by technology
[0002] The existing calibration of the output of the sensor often uses an analog calibration method. This method leads to a very complicated compensation circuit for the sensor, and it is difficult to calibrate the nonlinear coefficients of the second order or above. Therefore, how to solve the existing The shortcoming that technology exists has become the technical problem urgently to be solved by those skilled in the art
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[0012] see figure 1 , which is a schematic diagram of a sensor signal conditioning circuit, in which a sensor (Sensor), a programmable amplifier (PGA), an input zero offset adjustment circuit (offset cancellation), and a linearly adjusted voltage source (LDO) are respectively arranged in the sensor signal conditioning circuit , Reference Source (REF), Temperature Sensor (TEMP), Oscillator (OSC), One Time Programmable Memory Unit (OTP), Multiplexer (MUX), Incremental Sigma Analog-to-Digital Converter (SDM), Downsampling Filter (DEC), calibration unit (Calibration), I2C interface circuit (IIC) and digital-to-analog converter (DAC), etc., and the sensor signal conditioning circuit is respectively connected with bridge arm excitation voltage (VBR), power supply voltage (VDD) and Ground (VSS), which also has a bridge arm negative input terminal (IN), a bridge arm positive input terminal (IP), a second auxiliary negative input terminal (IN2), a second auxiliary positive input termin...
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The invention discloses a digital calibrating method of an adjusting circuit of sensor signals, which comprises the following steps: firstly, the adjusting circuit of sensor signals is led to work in a zero-input state, a zero-input error adjusting controller of the adjusting circuit of sensor signals is adjusted according to the digital outputs of the adjusting circuit of sensor signals in the zero-input state so as to minimize the zero-input error of the adjusting circuit of sensor signals; secondly, the adjusting circuit of sensor signals that is processed by the zero-input error adjustment is lead to work respectively in a state with one different sensitivity parameter and the other same sensitivity parameters, and the amplifier gain of the adjusting circuit of sensor signals is adjusted according to each digital output value of the adjusting circuit of sensor signals; finally, the adjusting circuit of sensor signals that is processed by the zero-input error adjustment and the gain adjustment is led to work respectively in a state with all different sensitivity parameters, and compensation factors in each order of the adjusting circuit of sensor signals are adjusted according to each digital output value of the adjusting circuit of sensor signals, thus realizing the digital calibration of the adjusting circuit of sensor signals.
Description
technical field [0001] The invention relates to a digital calibration method for a sensor signal conditioning circuit, in particular to a digital calibration method for a sensor signal conditioning circuit with one sensitive parameter and multiple sensitive parameters. Background technique [0002] The existing calibration of the output of the sensor often uses an analog calibration method. This method leads to a very complicated compensation circuit for the sensor, and it is difficult to calibrate the nonlinear coefficients of the second order or above. Therefore, how to solve the existing The shortcoming that technology exists has become the technical subject that those skilled in the art need to solve urgently. Contents of the invention [0003] The purpose of the present invention is to provide a digital calibration method for a sensor signal conditioning circuit, so as to realize the digital calibration of the sensor signal conditioning circuit with one sensitive para...
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IPC IPC(8): G01D18/00
Inventor 许刚
Owner 豪威国际控股有限公司