Inertial acceleration transducer frequency control force feedback signal processing circuit

Abstract

The invention relates to an inertial acceleration transducer frequency control force feedback signal processing circuit which comprises a weak signal amplification circuit, a filter integrating circuit, a current mode controlled oscillator and a digital differential circuit. The input end and the output end of the weak signal amplification circuit are connected with an acceleration sensor and the filter integrating circuit respectively, so as to amplify the collected weak signal; the input end and the output end of the filter integrating circuit are connected with the weak signal amplification circuit and the current mode controlled oscillator respectively, so as to amplify integrated signal error; the input end and the output end of the current mode controlled oscillator are connected with the filter integrating circuit and the digital differential circuit respectively, so as to output signal through the phase integrating system; the input end and the output end of the digital differential circuit are connected with the current mode controlled oscillator and the acceleration sensor respectively, so as to output quantized noise plastic signal containing feedback information, and feedback the feedback input end of the acceleration sensor. The circuit provided by the invention is high in signal processing precision, has a simple structure, and is good in usage effect.

Description

technical field [0001] The invention relates to the technical field of acceleration sensor signal processing, in particular to a frequency-controlled force feedback signal processing circuit of an inertial acceleration sensor. Background technique [0002] As the acceleration sensor system has higher and higher requirements on the accuracy of the circuit chip for processing the sensor output signal, the signal processing chip of the acceleration sensor has become a hot research topic in the industry. [0003] Resolution and linearity are the most important performance indicators of micro inertial sensors. Resolution characterizes the minimum value of the input signal that the sensor can distinguish, and is limited by the minimum value of the input signal that the sensor can distinguish, and is limited by the mechanical and thermal noise of the sensor and the noise of the ASIC circuit. High-end applications such as navigation require micro accelerometers with sub- Microg res...

AI Technical Summary

Problems solved by technology

The parasitic capacitance of the inertial sensor can only filter out part of its energy, so the output signal will generate electromagnetic interference in the circuit system, which will increase the power consumption of the entire system circuit and affect the accuracy of the inertial sensor.

Therefore, the above factors pose challenges to the design of high-precision system circuits.

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