Multi-rate measurement ASIC chip capable of adjusting sampling rate and frequency

Abstract

The invention discloses a multi-rate sampling-rate-adjustable frequency measurement ASIC chip, and the chip comprises a period counting module which is used for synchronizing an analog oscillation signal F of a tested silicon micro-resonant accelerometer to a reference clock clk provided by a crystal oscillator, counting the synchronized analog oscillation signal through the reference clock, and outputting a count value N; the nonlinear compensation module is used for converting the count value N into a fixed-point number M in direct proportion to the square of the frequency, then aligning the fixed-point number M with an input oscillation signal F, and then outputting an aligned fixed-point number Dout; the arbitrary sampling rate adjusting module is used for adjusting the sampling rate of the output fixed-point number Dout and outputting the final fixed-point value Dout3 at the arbitrary sampling rate; and the digital interface module is used for communicating with an upper computer, configuring a register and outputting data to the upper computer. According to the invention, digital output of the silicon micro-resonant accelerometer can be realized, and the problem of output nonlinearity of the silicon micro-resonant accelerometer is solved.

Description

technical field [0001] The invention relates to the field of digital signal processing and hardware programming, and relates to the realization of a frequency measurement algorithm on an application-specific integrated circuit, in particular to a multi-rate adjustable sampling rate frequency measurement ASIC (Application Specific Integrated Circuit) chip. Background technique [0002] Frequency is one of the most basic physical quantities, especially in the fields of electronic technology and digital signal processing. Due to the advantages of high anti-interference and convenient transmission of frequency signals, sensors with frequency as output are used in aerospace, navigation, satellite positioning, Anti-missile systems and other fields continue to rise, and low-power and high-precision frequency measurement methods have become a research hotspot for experts from all over the world. The frequency measurement methods for oscillating signals mainly include phase-locked lo...

AI Technical Summary

Problems solved by technology

The advantages are simple structure and low power consumption. The disadvantages are that the matching degree with the resonant accelerometer is not high, the output nonlinearity is large, and the accuracy cannot meet the requirements.

In summary, the above frequency measurement methods have their own advantages and disadvantages, and it is difficult to meet the frequency reading requirements of silicon microresonant accelerometers with low power consumption, high precision and large bandwidth.

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