Title :
Oversampling enhancement in sigma delta modulators
Author :
Belotti, Oscar ; Perez, Aldo Pena ; Maloberti, Franco
Author_Institution :
Dept. of Electron., Univ. of Pavia, Pavia, Italy
Abstract :
A method that virtually double the oversampling ration of a second order sigma-delta (ΣΔ) modulator is described. Accounting for a limited cost, the resolution increases by about 2-bit and power just increases by few percents. Therefore, the FoM diminishes by a factor close to 3.5. Simulation at the behavioral level of the proposed method verifies the operation. Circuit level schemes indicates that the architecture does not requires higher op-amp bandwidth. The method can be used with multi-bit quantizer without requiring additional efforts for the DEM.
Keywords :
sigma-delta modulation; circuit level schemes; multibit quantizer; oversampling enhancement; second order sigma-delta modulator; Capacitors; Clocks; Delay; Equations; Modulation; Quantization; Signal to noise ratio; ΣΔ; oversampling; quantization;
Conference_Titel :
Ph.D. Research in Microelectronics and Electronics (PRIME), 2011 7th Conference on
Conference_Location :
Trento
Print_ISBN :
978-1-4244-9138-4
Electronic_ISBN :
978-1-4244-9136-0
DOI :
10.1109/PRIME.2011.5966278
