Title :
Multirate cascaded continuous time ΣΔ modulators
Author :
Ortmanns, Maurits ; Samid, Lourans ; Manoli, Yiannos ; Gerfers, Friedel
Author_Institution :
Chair of Microelectron., Freiburg Univ., Germany
Abstract :
Cascaded continuous time sigma-delta (ΣΔ) modulators provide a favourable way to achieve high resolution, high speed A/D converters. This paper presents a way to upgrade the advantages further by using multirate cascaded continuous time modulators. Therewith high resolution can be achieved with even lower oversampling ratio and therefore lower power consumption than in the single rate case. Here we show the successful synthesis of a multirate cascaded (2-1) continuous time ΣΔ modulator. The performance is analyzed theoretically and by simulations. Finally it is shown what speed forfeits we have to own up to. It will be shown that multirate cascaded continuous time ΣΔ modulators are useful to achieve high speed, high resolution A/D converters.
Keywords :
cascade networks; circuit simulation; continuous time systems; high-speed integrated circuits; low-power electronics; sigma-delta modulation; continuous time ΣΔ modulators; high speed A/D converters; multirate cascaded modulators; oversampling ratio; power consumption; resolution; simulations; Circuits; Clocks; Delta modulation; Digital filters; Digital modulation; Energy consumption; Error correction; Jitter; Linearity; Sampling methods;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1010430
