
Radioengineering 2012
Design of the 12bit DeltaSigma Modulator using SC Technique for Vibration Sensor Output ProcessingKeywords: Vibration sensor , DeltaSigma modulator , Switched Capacitor technique , MATLAB model Abstract: The work deals with the design of the 12bit DeltaSigma modulator using switched capacitors (SC) technique. The modulator serves to vibration sensor output processing. The first part describes the DeltaSigma modulator parameters definition. Results of the proposed topology ideal model were presented as well. Next, the DeltaSigma modulator circuitry on the transistor level was done. The ONSemiconductor I2T100 0.7 um CMOS technology was used for design. Then, the DeltaSigma modulator nonidealities were simulated and implemented into the MATLAB ideal model of the modulator. The model of real DeltaSigma modulator was derived. Consequently, modulator coefficients were optimized. Finally, the corner analysis of the DeltaSigma modulator with the optimized coefficients was simulated. The value of SNDR = 82.2 dB (ENOB = 13.4 bits) was achieved.
