A wide-bandwidth, wide dynamic-range thermal ΣΔ architecture for convective accelerometers

This work describes the implementation and the modeling of a convective accelerometer with 1(st)-order thermal Sigma Delta readout. This closed-loop system is obtained by the hybrid combination of a CMOS sensor prototype which includes an amplifier, and discrete electronic devices. A high comparator precision is reached by dynamic offset cancellation of the amplifier. After a modeling of the Johnson noise and of the quantization-noise, the parameters of the modulator are optimized to get a good linearity, an improved gain precision and a wide dynamic range.