Because of lower mechanical thermal noise

accelerometer sensor with high quality value（ Q value） is suitable for high-performance vibration detection

but over high Q value will cause instability of interface circuits.In order to make good use of characteristic of sensor to optimize design of Sigma-Delta（ ∑Δ） digital interface circuit

through analyzing model for digital interface circuit of accelerometer

verify effect of Q value on digital quantization noise

and the quantization noise in base band will be reduced by choosing proper Q value. PCB circuit based on sandwich accelerometer is designed and tested

and test results show that high Q value of sensor will bring a pair of conjugate zero point in base-band and restrain quantization noise in base-band.