Title :
A micro power continuous-time /spl Sigma//spl Delta/ modulator
Author :
Samid, Lourans ; Manoli, Yiannos
Author_Institution :
Freiburg Univ., Germany
Abstract :
This paper presents the design of a micro power continuous time third order low pass sigma delta /spl Sigma//spl Delta/ modulator. The loop filter has been implemented by using active RC-integrators. 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 on the overall /spl Sigma//spl Delta/ modulator are discussed. Measurement results of the 1.5 V CT /spl Sigma//spl Delta/ modulator show a 58 dB SNDR in 50 kHz signal bandwidth and a sampling frequency equal to 3.2 MHz. The power consumption is 70 /spl mu/W.
Keywords :
RC circuits; continuous time systems; distortion; integrating circuits; low-pass filters; low-power electronics; sigma-delta modulation; 1.5 V; 3.2 MHz; 50 kHz; 70E-6 W; SNDR; active RC-integrators; continuous-time /spl Sigma//spl Delta/ modulator; loop filter; low pass /spl Sigma//spl Delta/ modulator; low supply voltage; micropower /spl Sigma//spl Delta/ modulator; power consumption; sampling frequency; signal bandwidth; third order /spl Sigma//spl Delta/ modulator; Bandwidth; Delta modulation; Delta-sigma modulation; Distortion measurement; Energy consumption; Feedback; Filters; Frequency measurement; Low voltage; Sampling methods;
Conference_Titel :
Solid-State Circuits Conference, 2003. ESSCIRC '03. Proceedings of the 29th European
Conference_Location :
Estoril, Portugal
Print_ISBN :
0-7803-7995-0
DOI :
10.1109/ESSCIRC.2003.1257098
