SC ΣΔ converter for vibration sensor processing system
Michal Pavlík, Vilém Kledrowetz, Jiří Háze, Marián Pristach, Roman Prokop, Lukáš Fujčík, Fabian Khateb · 2013
The paper deals with a design of the 12-bit sigma delta (ΣΔ) modulator using switched capacitor technique (SC). It is a part of the system for vibration sensor output processing. Processing system consists of pre-amplifier, delta-sigma modulator and decimation digital filter. Detailed description of design process of the ΣΔ modulator is described in article. The design process starts by parameter requirements determination, continuing by structure proposal, design method and coefficients selection, selecting of compensation methods and concluding by design on the chip. ONSemi I2T100 700 nm CMOS technology was used for design. The value of SNDR = 81.1 dB (ENOB = 13.2 bits) was achieved.