Design of the 12-bit Delta-Sigma Modulator using SC Technique for Vibration Sensor Output Processing

• Main Authors: M. Pavlik, V. Kledrowetz, J. Haze
• Format: Article
• Language: English
• Published: Spolecnost pro radioelektronicke inzenyrstvi 2012-04-01
• Series: Radioengineering
• Subjects: Vibration sensor; Delta-Sigma modulator; Switched Capacitor technique; MATLAB model
• Online Access: http://www.radioeng.cz/fulltexts/2012/12_01_0246_0251.pdf

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