Title :
Fourth-order cascade SC ΣΔ modulators: a comparative study
Author :
Medeiro, Fernando ; Pérez-Verdu, Belén ; Manuel de la Rosa, J. ; Rodríguez-Vázquez, Angel
Author_Institution :
Centro Nacional de Microelectron., Inst. de Microelectron. de Sevilla, Spain
fDate :
10/1/1998 12:00:00 AM
Abstract :
Fourth-order cascade ΣΔ modulators are very well suited for IC implementation using analog sampled-data circuits because of their robust, stable operation and their capability to achieve high resolution and wide bandwidth with moderate power consumption. However, their optimum realization requires careful consideration of their performance degradations due to the hardware nonidealities. This paper presents a comparative study of the influence of finite op-amp gain and capacitor mismatch on the performance of fourth-order cascade ΣΔ modulators realized by means of switched-capacitor circuits. It considers single-bit and multibit quantizers and draws a number of comparative remarks validated by time-domain behavioral simulations
Keywords :
cascade networks; modulators; sigma-delta modulation; switched capacitor networks; time-domain analysis; ADC; IC implementation; SC sigma-delta modulators; analog sampled-data circuits; capacitor mismatch; finite op-amp gain; fourth-order cascade ΣΔ modulators; high resolution; multibit quantizers; single-bit quantizers; stable operation; switched-capacitor circuits; time-domain behavioral simulations; wide bandwidth; Analog integrated circuits; Bandwidth; Degradation; Energy consumption; Hardware; Operational amplifiers; Performance gain; Robustness; Sampled data circuits; Switched capacitor circuits;
Journal_Title :
Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on
