Qiang FU, Liang YIN, Wei-ping CHEN, et al. ASIC design of micro-mechanical gyro interface of low temperature drift quartz with temperature compensation[J]. Optics and precision engineering, 2017, 25(7): 1843-1849.
DOI:
Qiang FU, Liang YIN, Wei-ping CHEN, et al. ASIC design of micro-mechanical gyro interface of low temperature drift quartz with temperature compensation[J]. Optics and precision engineering, 2017, 25(7): 1843-1849. DOI: 10.3788/OPE.20172507.1843.
ASIC design of micro-mechanical gyro interface of low temperature drift quartz with temperature compensation
Through analyzing operating principle of quartz gyro
interface circuit of closed-loop self-excited drive and based on principle of low-noise phase sensitive demodulation was designed
and influence of driving force coupling on zero position output was researched to increase environmental adaptability of quartz gyro. Effect of temperature on amplitude of driving force was obtained through researching temperature feature on aspects of air damping and resonant frequency
etc of sensitive header of sensor. Then method of conducting temperature compensation via amplitude of driving force was proposed. Temperature features of interface circuit and influence to zero position output of gyro were analyzed
and operational amplifier unit of constant bandwidth in the whole temperature area was designed to restrain temperature drift due to change of proportion of high-frequency harmonic component in detection signal. The chip was implemented in high voltage N-well CMOS process and interface ASIC with low-temperature drift was achieved. Cyclic test of zero position temperature was conducted on whole machine of quartz gyro in temperature scope of -45℃~85℃ to conduct three-order fitting compensation on zero position output with amplitude of driving force. Zero position temperature drift of whole temperature after compensation was less than 20°/hr(1σ)with short-term stability and output noise respectively as 5°/hr and 0.001°/s/√Hz.
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