Title :
A fourth-order cascaded full feed-forward sigma-delta modulator
Author :
Lu, Qiang ; Liu, Xiaowei
Author_Institution :
Dept. of Microelectron., Harbin Inst. of Technol., Harbin, China
Abstract :
This paper presents a structure of a fourth-order cascaded full feed-forward Sigma-delta modulator. Because there is no feedback but only feed-forward path between two stages, cascaded sigma-delta modulator is unnecessary to consider the stability problems, and has the identical performance with ideal high-order single-loop sigma-delta modulator. The system level simulation results show that the signal to noise rate (SNR) of the designed sigma-delta modulator is 148 and the effective number of bits (ENOB) is 24.4 when the oversampling ratio (OSR) is 128.
Keywords :
circuit stability; feedforward; sigma-delta modulation; SNR; feedforward path; fourth-order cascaded full feed-forward sigma-delta modulator; high-order single-loop sigma-delta modulator; signal to noise rate; stability problems; system level simulation; Microelectronics; Modulation; Periodic structures; Quantization; Sigma delta modulation; Signal to noise ratio; cascade; modulator; quantization noise; sigma-delta; system;
Conference_Titel :
Optoelectronics and Microelectronics (ICOM), 2012 International Conference on
Conference_Location :
Changchun, Jilin
Print_ISBN :
978-1-4673-2638-4
DOI :
10.1109/ICoOM.2012.6316316
