Title :
An ultra low power continuous-time sigma delta modulator
Author :
Samid, Lourans ; Manoli, Yiannos
Author_Institution :
Freiburg Univ., Germany
Abstract :
This paper presents the design of a continuous time third order low pass sigma delta ΣΔ modulator. The loop filter has been implemented by using an active RC-integrator in the first stage and a transconductance-capacitor (Gm-C) integrator in the second and third stage. The influence of the low supply voltage on the building blocks, such as the amplifier and the common mode feedback, as well as the distortion of the Gm-cells on the overall ΣΔ modulator are discussed. Simulation results of the 1.5 V CT ΣΔ modulator show a 60 dB SNDR in a bandwidth of 50 kHz and a sampling frequency equal to 3.2 MHz. The power consumption is 50 μW.
Keywords :
circuit CAD; circuit feedback; circuit simulation; continuous time filters; integrating circuits; low-pass filters; low-power electronics; sigma-delta modulation; ΣΔ modulator; 1.5 V; 3.2 MHz; 50 kHz; 50 muW; Gm-cell distortion; SNDR; active RC-integrator; amplifier; bandwidth; building blocks; common mode feedback; continuous time third order low pass sigma delta modulator; loop filter; power consumption; sampling frequency; supply voltage; transconductance-capacitor integrator; ultra low power continuous-time sigma delta modulator; Bandwidth; Batteries; Circuit noise; Delta modulation; Delta-sigma modulation; Feedback; Filters; Noise reduction; Power dissipation; Voltage;
Conference_Titel :
Electronics, Circuits and Systems, 2003. ICECS 2003. Proceedings of the 2003 10th IEEE International Conference on
Print_ISBN :
0-7803-8163-7
DOI :
10.1109/ICECS.2003.1301903
